CHAPTER 2: HOOKUP

2.0 POWER
The BRC works with any AC voltage from 90 to 250 volts, 50 to 60 Hz. This eliminates the need for transformers or voltage switches. The BRC comes with a line cord for the destination to which the BRC is shipped. The BRCs IEC-spec AC cord (do not substitute any other AC cord) is designed to feed an outlet that includes three pins, with the third, round pin connected to ground. The ground connection is an important safety feature designed to keep the chassis of electronic devices such as the BRC and ADAT at ground potential. Unfortunately, the presence of a third ground pin does not always indicate that an outlet is properly grounded. Use an AC line tester to determine this. If the outlet is not grounded, consult with a licensed electrician. When AC currents are suspected of being highly unstable in VAC and Hz, a professional power conditioner should be used.
2.1 SYNCHRONIZING MULTIPLE ADATS
2.1A Hooking Up Multiple ADATs
Synchronization requires a dual male, 9-pin D connector to connect the BRC to the first ADAT in your system, and an additional dual male, 9 pin D connector for each additional ADAT to be synchronized. This connection can be made while power is on or off, and the ADATs do not need to be turned on in any particular order (see figure 1). The maximum cable length allowed is 50 feet, between the BRC and the first ADAT in the system. 1. Connect one end of the cable to the BRCs sync out jack; 2. Connect the other end of the cable to the sync in jack of the first ADAT in the system (this unit will serve as tracks 18); 3. For each additional ADAT slave, connect one end of an additional dual male, 9-pin D connector to the first ADAT slaves sync out jack, and the other end to the second ADAT slaves sync in jack. Its sync out jack then connects to the third ADAT slaves sync in jack, and so on; Note: In a multiple ADAT system, if power is turned off on one of
the ADATs in the middle of the chain, all ADATs following it will no longer sync to the BRC, as the sync information will not pass through a unit that is turned off. Figure 1
2.1B ADAT ID (identification) Numbers
After you have connected multiple ADATs and turned the machines on (they can be turned on in any order), you may now turn on the BRC, which will in turn assign ID numbers for each slave ADAT in the system. This is done automatically. You will see each ADAT momentarily display its assigned ID number. The ID numbers are assigned in ascending order, according to the order that the slave units are connected. So the first unit in the chain is assigned ID 1, the second is ID 2, and so on. Anytime an ADAT or the BRC is turned on or off, the ADATs will evaluate the situation and determine a master, which will in turn re-assign ID numbers.

to the second ADATs optical in jack. Its optical out jack then connects to the third ADATs optical in jack, and so on; 4. Finally, connect one end of a fiber optic cable to the last ADATs optical out jack, and the other end to the first ADATs optical in jack. This last step creates a loop, and thus makes the digital bus accessible to all ADATs that are connected to it. Note: Always connect the optical cables in the same order as the sync cables, so that the digital routing will work correctly.

2.2B Connecting the AI-1

To connect an Alesis AI-1 module, simply insert it into the digital bus loop that was described above in 2.2A, at the end of the ADAT chain. You must also connect the sync cables so that the AI-1 is inserted between the BRC and the first ADAT in your system (see figure 2). 1. Connect one end of the fiber optic cable into the optical output of the last ADAT in the system; 2. Connect the other end of the fiber optic cable to the ADAT optical input of the first AI-1 in the system; 3. Connect one end of a fiber optic cable to the AI-1s ADAT optical out jack, and the other end to the first ADATs optical in jack. This step creates a loop, and thus makes the digital bus accessible to all ADATs and all AI-1 modules connected to it; 4. Finally, connect one end of a dual male, 9-pin D connector to the BRCs sync out jack, and the other end to the AI-1s sync in jack. The AI-1s sync out jack must then be connected to the sync in jack of the first ADAT in your system;

Figure 2

5. When recording audio from AES/EBU or S/PDIF source, the ADAT(s) must be synchronized to the incoming digital signal. This means you will not only need to connect the AI-1 to the digital bus (as described above), but you must also connect the AI1s 48 KHz output to the BRCs 48 KHz input, using a standard shielded BNC cable. For more information about sample rate conversion and interfacing the AI-1 with other digital audio equipment, please refer to the AI-1s owners manual.

2.3 SMPTE IN/OUT

The SMPTE input and output connectors are 1/4" jacks. SMPTE input is for syncing to an external device. SMPTE output is for generating sync to an external device. For more information about SMPTE, see section 5.0.

2.4 MIDI IN/OUT

The MIDI input and output connectors are 5-pin DIN jacks. MIDI input is provided for receiving various MIDI messages. MIDI output is provided for generating MTC, MIDI Clock, and system exclusive messages. For more information about MIDI, see section 5.3.

CHAPTER 3: GETTING READY RECORD

3.0 POWERING-UP

After all connections are made, turn on the power of each ADAT in the system, and then turn on the BRC. Its main power switch is located on the far left side of the back panel, when you are facing the front panel. When power is first turned on, the BRC checks to see how many slave ADAT units are connected to it. If at least one ADAT is connected, the BRC automatically becomes the master and assigns an ID number to each of the connected ADAT slaves. The ID numbers are assigned in ascending order according to the order that the slave units are connected (see section 2.1A and figure 1). While assigning ID numbers, the BRCs display will count the number of ADATs it recognizes. For example: if you have four ADATs connected (32 tracks), the BRC will recognize each one at a time, and the display will look like this: ALESIS BRC 01 ADAT slaves ALESIS BRC 02 ADAT slaves ALESIS BRC 03 ADAT slaves ALESIS BRC 04 ADAT slaves The BRC will continue searching for ADATs until it is sure there are no more connected. Eventually, after about five seconds, the BRC will come on-line, and the display will look like this: ALESIS BRC Copyright 1993 After assigning ID numbers, the BRC queries each of the devices to find out its current status.
If the first ADAT doesnt have a tape in its drive, the Tape Location counter on the BRC will display "-- -- -- -- --" (the slave ADATs will display "-- --"). The BRC will query each unit that contains an inserted tape as to its format status. If the first ADATs tape is formatted, the BRC will display the current real-time location of the first slave unit and locate all slaves to this same location. If the first ADATs tape is unformatted, the BRC will display "noFO". Note: The BRCs transport controls are not active for a unit without tape. They are active for an unformatted tape, but an unformatted tape will not be controlled as accurately as a formatted tape. If an unformatted tape is inserted, the ADATs tape counter will display "noFO", no audio will sound and the FORMAT LED will flash on the ADAT(s).

3.1 FORMATTING TAPES

Just as formatting a floppy disk lets a computer know where to place data, formatting an ADAT tape time-stamps the tape to single-sample accuracy so that audio is referenced to an accurate time base. This allows for simplified synchronization, accurate tape counter readings, and intelligent autolocation. When formatting begins, ADAT writes some setup data during the first two minutes and fifteen seconds of tape, then at time -00:05, it writes the time in minutes and seconds onto a special sync track. This does not use up any of the eight audio tracks. The time-stamping continues until the end of the tape is reached, or STOP is pressed. To format a new tape (or to reformat/erase an old tape): 1. Press the FORMAT button. The FORMAT LED should now be lit solid; 2. To select a single tape machine to format, press the EDIT button followed by the FORMAT button. The display will show the following:

Format Tape A ll

If you wish to format all tapes, jump ahead to step 6a. If you wish to perform a selective format, continue to step 3. 3. Press the Right Cursor button;
The display will now look like this: Format Tape xx Disable where XX is a tape machine number 116. 4. Use the UP/DOWN buttons to choose any of the ADATs in your system; 5. Use the Right Cursor button to move the cursor to the lower field, and use the UP/DOWN buttons to Enable or Disable formatting; Note: If no tapes are enabled for formatting and the FORMAT button is pressed, the following message will appear: Selective Format no tapes enabled If Format mode is enabled for one or more ADATs, the FORMAT LED will light solid on all format enabled ADATs to indicate that format mode will be entered if recording is started. Also, all track RECORD LEDs of the format enabled ADATs will be flashing to indicate that all tracks on those tapes will be erased. Pressing the RECORD ENABLE buttons will have no effect while the format LED is lit solid. 6a. To perform a complete format: Rewind all tapes to the beginning and initiate a record (hold RECORD and press PLAY); When performing a complete format, the ADAT places 15 seconds of leader (display reads "LEAd") at the start of the tape(s), followed by 2 minutes of data (display reads "data"). Also note that any recordenabled tracks will not go into record until the tape counter reads 00:00, which occurs after the pre-audio LEAD and DATA portions. 6b. To perform a format extend: Make sure all tapes are playing in sync; and initiate a record (hold RECORD and press PLAY);

When performing a format extend, the ADAT begins "timestamping" from the last valid time-stamp read from the formatted tape. This allows a partially formatted tape to have its format extended by entering format mode before the end of the previously formatted section. When formatting, all previous information on the tape portion being formatted will be lost. 7. Press the STOP button to disengage formatting; Note: The only way to stop formatting is to press STOP (i.e. you cannot punch-out the way you can from a normal record). 8. After the format is complete (because either the end of the tape was reached or you stopped recording), the FORMAT LED turns off. If you try to initiate a format when tapes are at various locations, then the type of format that is performed on each ADAT is dependent upon the current tape status as follows: If the tape is unformatted: If at the start-of-tape (i.e. rewound to the very beginning), then a complete format (FORMAT 0) will be performed. If not at start-of-tape, then format will be disabled and no recording will take place. If the tape has already been formatted: If in the pre-audio portion of tape (before 00:00), then the tape will be automatically rewound to the start-of-tape and a complete format (FORMAT 0) will be performed. While the tape is being auto-rewound, the ADAT display will read -FO- and the rewind LED will flash. This indicates that it must FORMAT OVER from the LEAD or beginning portion of the tape. If in the audio portion of the tape (past 00:00), then the tape will be format extended after entering record.
3.1A Additional Formatting Considerations
Blank tapes must be rewound to the very beginning in order to be formatted. Caution: Do not re-format over a previously formatted tape, and then stop re-formatting. When the tape transitions from the newly-
formatted part to the previously formatted part, there will be timing discontinuities and the audio will do unpleasant things. Also, during that transition the tape will be non-functional and you will not be able to record anything over it. When in doubt, either re-format the tape all the way to the end, or back up a bit and perform a format extend (see previous section) when you need to re-format over the transition zone. Its a good idea to format a tape from start to finish, but this isnt necessary. To extend the format on a partially formatted tape, enter format mode before the end of the previously formatted section. Everything on the tape will be erased from that point on. Audio can be recorded while formatting is taking place, just in case you have a hot musical idea you wish to preserve in a hurry, but have no formatted tapes. Simply put the desired tracks into record-ready (see section 3.2B) before pressing the FORMAT button. Tracks not record-enabled prior to pressing the FORMAT button will be recorded with silence, and cannot be record-enabled once formatting begins. Tapes can be bulk-erased with a bulk tape eraser designed to erase VCR cassette tapes.

4.1H Using the LRC Remote Control
To use the LRC, plug it into either the Locate/Play jack or the Punch In/Out jack, both located on the back of the BRC. Actually, you could connect two LRCs by using both jacks. Unlike when connected to an ADAT, the LRC is used as a remote control of the BRC. The LRC offers the following functions: Transport functions. Rewind, Review, Fast Forward, Cue, Stop, Play, and Record. Autolocation functions. Locate 0, Locate 1, Locate 2, Set Locate, Locate 2>1 (Loop), and Auto Play. Track functions. Auto Input and All Input. The locate functions on the LRC allow you to locate to 0, locate point 01 or locate point 02. Locate points 0322 are inaccessible, as are manual positions. You can also set locate points from the LRC, using the SET LOCATE button in the same manner as pressing the SET LOCATE button on the BRC (see section 4.1C). Note: If the Locate/Play footswitch you are using is a normally open type, the footswitch and LRC remote control can be interchanged at any time, or used simultaneously with a Y-cord. If the Play/Locate footswitch is a normally closed type, the BRC will have to be reset when switching between the footswitch and the remote, and they will not work simultaneously with a Y-cord. To do this: 1. Unplug the device you dont want to use (footswitch or remote); 2. Turn off the BRC; 3. Plug in the device you want to use (footswitch or remote);

4. Turn on the BRC.

4.1I Auto-Play
Press the AUTO PLAY button to enable Auto Play (its LED will be lit). This causes the BRC to automatically enter Play mode whenever any locate function is complete, although this can be overridden by the transport controls. This button can be pressed at any time. Note: A one time auto play function can be initiated by pressing PLAY once after initiating a locate search and before the locate point is reached. The PLAY button will flash until the locate point is reached, then enter Play mode. Pressing PLAY twice will cancel the locate search and initiate Play mode. Note: The AUTO PLAY button will automatically turn on whenever the Loop function is turned on (see sections 4.2).

4.2 LOOPING

This button can be pressed at any time to turn on the Loop function. Enabling the LOOP button causes all slave ADATs to automatically return to the Loop Start point after reaching the Loop End point. This works during playback or record. The Loop Start and Loop End points can be assigned to any of the 22 locate points already memory (see 4.1E). These may be set as described below. When the LOOP button is pressed, the LOOP LED will go on to indicate that you are in Loop Mode. If LOOP is on, and the Loop End point is reached while in record, recording will be stopped before rewinding to the Loop Start point. Whenever Loop Mode is turned on, the AUTO-PLAY button is automatically turned on as well (the AUTO-PLAY LED will go on) to indicate that when the Loop Start point is reached, the BRC will go back into play. This creates a true, endless loop. If you do not want the BRC to engage playback upon returning to the Loop Start point, you can turn off Auto-Play mode by pressing the AUTO-PLAY button. This creates an Auto-Return mode. If LOOP is turned on while in Play mode and the tape location is already past the Loop End point, the BRC will not rewind back to the Loop Start point (the LOOP will only function while passing through the Loop End point).

If there is only one ADAT connected, Continuous mode will not be selectable from the previous page (Offset mode). If there are two ADATs connected, then X will be 2, and YY will not be displayed. This indicates that only the second unit will be offset. If there are three ADATs connected, then X will be 3, and YY will not be displayed. This indicates that only the third unit will be offset. If there are 16 ADATs connected, X and YY will be 9-16, respectively, since ADATs 18 will be recording first. If there are an odd number of ADATs connected (7, for example), then there will be one less in the second set of ADATs than in the first (X=5, Y=7; this assigns ADATs 14 to the first group and ADATs 57 to the second group). 6. Press the EDIT button to exit edit mode; 7. Press the TAPE OFFSET button to turn it on (its LED will be lit). Example: To use this feature with eight ADATs and a 30 minute offset: 1. Set the Continuous mode offset to 30 minutes; The display should look like this: Offset Tape 5-8 by 30 minutes 2. Place tracks 1 through 64 in record ready using the TRACK SELECT buttons; 3. Place 8 tapes into the ADATs, and rewind them to the beginning. If the tapes are not formatted, enable the FORMAT function. Tracks must be in record ready before enabling format; 4. Enter record by pressing RECORD and PLAY. The first four ADATs will start recording from their current location, and the second four ADATs will locate to the beginning of their tapes (if they are not already there); 5. When the first four ADATs reach 27:45, the second four ADATs will start recording (if Format is on, they will start formatting). Since there are 15 seconds of leader and two minutes of data at the 56
beginning of each tape, this will cause the second set of ADATs to be at 00:00 by the time the first set of ADATs reach 30:00. The second set of ADATs will begin recording at 00:00, and the first set of ADATs will continue recording until they run out of tape, at which point they will stop; 6. Press EJECT on the BRC. Since EJECT does not function on ADATs that are in record, only the first four ADATs will eject, while the second four remain in RECORD; 7. Insert four new tapes into the first set of ADATs. If they are not at the beginning of the tape, they will rewind automatically; 8. When the second four ADATs reach 27:45, the first four ADATs will start recording (if Format is on, they will start formatting). Now, the first set of ADATs will begin recording at 00:00 when the second set of ADATs reach 30:00; 9. When finished recording, press STOP, or simply do not insert a new set of tapes into the next set of ADATs. To play back in Continuous mode, simply activate play without pressing RECORD. The ADATs will function as described above, but will not be in record. Note: The Continuous mode function requires that both sets of ADATs be wired to the same inputs. However, you may not use the digital output of the first set of ADATs as an input source to the second set of ADATs.

4.6 WHAT IS A SONG?

A Song is used to store certain parameters of the BRC, including: all 20 locate points and their names, Pre/Post-Roll times, Auto-Punch points, Loop points, Track Delays, Tape Offsets, Track Group buttons, Tempo Map, SMPTE format, SMPTE start offset, Gen Sync settings and Ext Sync settings. The Song Start point is used to determine the location of the beginning of the recording, referred to as Bar 0101/00, and SMPTE START 00:00:00:00. This, of course, directly effects the Tape Position Counter when using SMPTE or BARS Display Types. Songs are selected using the SET SONG button (see section 4.6A). When you select a song, all of its parameters are instantly recalled. Songs can be used to store different setups for different recordings on the same set of tapes. For example, if you recorded several versions of 57
the same song on one set of tapes, you could set up the parameters for the first recording (song start, SMPTE start offset, locate points, etc.) and then simply copy the information to as many song locations as you need, using the COPY SONG button (see section 4.6D). Each songs start position should be set to different locations of the tape you could record four versions of a five minute song by placing the start times of songs 1 through 4 at every 10 minute interval (song 01 = 01:00:00; song 02 = 11:00:00; song 03 = 21:00:00; etc.). If you copy the original song to the other song locations after setting their song starts to their relative positions on tape, all your locate points shift automatically in reference to the new song start position. Whenever you want to go to a specific location of a tape which is referenced to a song in the BRC, you can quickly get there by locating the song start using the LOCATE SONG button (see section 4.6C). The BRC can store up to 20 different songs in internal memory. The entire contents of the BRC, including all 20 songs and their parameters, can be stored to the beginning of each ADAT tape as a table of contents or TOC (see section 5.2A) or dumped via MIDI System-Exclusive (see section 5.3B), for recall at a later time.

4.6A Setting a Song

The SET SONG button is used to select a song. Any changes you make to the various song-related parameters (i.e. punch-points, track delays, etc.) are automatically stores with the selected song. To select a song: 1. Press the SET SONG button; The display will read: SXX "SongName " mm:ss:ff where XX is the song number (range: 01 through the highest existing song; maximum of 20), SongName is the 10-character song name (defaults to "Song Name "), and mm:ss:ff is the tape address that is used for locating the start of the song (defaults to 00:00:00). The address is displayed according to the type of Display Type you have selected. If in NORMAL mode, the display will read 00:00:00 (minutes:seconds:frames). If in SMPTE mode, the display will read 00:00:00:00 (hours:minutes:seconds:frames); if in BARS mode, the display will read 0101/00 (bars:beats:sub-beats).

Like all other locate changes, the song setup information is not actually deleted from the tape until you save the setup to tape, assuming you have already saved the setup at some point before deleting the song (see section 5.2). If you accidentally deleted a song, you could retrieve it by loading the setup data back from tape. Of course, deleting a song will never erase audio on tape.

4.7 DIGITAL BUSSING

The DIGITAL I/O button is used to enable/disable digital audio routing. This function is used to route the digital track information for the purposes of track copying and AES/EBU or S/PDIF input and/or output. When Digital I/O is enabled, its LED will light and the current digital inputs can be recorded to tape (all channels are received through the one fiber optic connector) and the analog inputs will be ignored. The type of digital input that is enabled by this button depends upon the type of digital input that is selected when this function is edited.

4.7A Digital Input

To select the type of digital input: 1. Press the EDIT button (the EDIT button LED will go on to indicate you are in Edit mode); 2. Press the DIGITAL I/O button; The display will read: Digital input: A DAT or Digital input: A ES/EBU or Digital input: S/PDIF 3. Use the UP/DOWN buttons to select the digital input to be the source for recording: ADAT, AES/EBU or S/PDIF. The second two options are only shown if an AI-1 is connected (see 4.7C). 4. Press the EDIT button to exit edit mode;
5. Press the DIGITAL I/O button to enable the digital bus (the DIGITAL I/O button LED will go on to indicate it is enabled).

4.7B Bouncing tracks

The BRC makes it possible to copy tracks between ADATs without leaving the digital domain. The BRC assumes you have connected the digital bus correctly between all ADATs in the system (see section 2.2A). If DIGITAL I/O is pressed again when the digital input display reads "ADAT", you may select which track(s) will be routed to the digital bus, and thereby sent to any tracks that are in record when DIGITAL I/O is enabled. This allows for digital track copying and backups. To digitally bounce tracks: 1. Press the EDIT button (the EDIT button LED will go on to indicate you are in Edit mode); 2. Press the DIGITAL I/O button; The display will read: Digital input: A DAT 3. Press the DIGITAL I/O button again while the digital input display reads ADAT; The display will show the following: Select source with trk buttons All the record and input track LEDs will turn off, as they no longer reflect the record/monitor status. The TRACK INPUT LEDs are now used to reflect the current source tracks. 4. Use the TRACK SELECT buttons to choose the source tracks (that is, the tracks to be assigned to the digital bus); If you select a track to be a source that was previously put into record-enable, it will automatically be taken out of record-enable. Once a track has been selected as a source, it cannot be put into record-enable while the DIGITAL I/O button is turned on.

4. Press the DIGITAL I/O button again while the digital input display reads AES/EBU or S/PDIF; The display will show the following: Select tracks to output to AI-1 All the record and input track LEDs no longer reflect the record/monitor status. The TRACK INPUT LEDs will now reflect the current source tracks to be output to the AI-1. 5. Use the TRACK SELECT buttons to select the source tracks; To select a single source track, press the desired RECORD-ENABLE button. The track will now be enabled and its green LED will be lit. Pressing the same button again will disable that track and turn off the LED. You may now select a different track. A maximum of two tracks may be selected at a time, and they must come from the same tape machine. When a track is selected as a source, any tracks from other machines that were previously selected will become disabled. If no tracks are selected, the AI-1's digital output will be silent. If only one track is selected, it will be routed to the left output of the AI-1, and the right output will be silent. The digital output routed to the AI-1 will always be active, whether DIGITAL I/O is turned on or off. However, if DIGITAL I/O is on and ADAT has been selected as the digital input, the tracks selected for output to the AI-1 must be the same or higher than the highest numbered track selected as source or record enabled. For example, if you have four ADATs (32 tracks) and you wish to output tracks 31 and 32 to the AI-1, it is still possible to simultaneously bounce digital audio between tracks 1 and 30. In addition, if recording from AES/EBU or S/PDIF, the tracks selected for output to the AI-1 must be the same or higher than the highest track that is record enabled. The reason for these restrictions has to do with the fact that there is a single 8-channel digital audio bus. The digital connections of the slave units are serial (i.e. the units are chained together with unit #1s digital output connected to unit #2s digital input, unit #2s digital output connected to unit #3s digital input, and so on), there can only be one set of information (one tape machine) on the digital bus at one time. This is why the output tracks must come from a unit that is the same or following the unit in the chain that is receiving the digital 67
input. 6. Press the DIGITAL I/O button again; The display will show the following: AI-1 Clock: 48K 7. Use the UP/DOWN buttons to select the AI-1s clock source (48K or 44.1K). This determines the output sample rate of the AI-1. Important: When recording audio from AES/EBU or S/PDIF, the ADAT(s) derive their clock source from the incoming digital audio via the optical digital bus, and are therefore perfectly in sync with the incoming source. However, it is important to note that the BRC also requires a 48 KHz clock in order to be synchronized to the incoming digital signal. Since the BRC has nothing to do with the ADATs optical digital bus, you will need to route clock information from the AI-1 to the BRC by connecting the AI-1s 48 KHz output to feed the BRCs 48 KHz input (see section 2.2B). Note: The BRCs 48KHz, SMPTE, and MIDI outputs will not be usable if the AI-1 provides no timing reference for the BRC. If the BRC is synchronizing to the 48KHz clock, SMPTE, or video sync, then all of the BRCs outputs will be usable. However, it is up to you to insure that the AES/EBU or S/PDIF digital audio signal is synchronous to the clock source that is connected to the BRC by providing it with clock information. Note: When the DIGITAL I/O button is turned on and the digital input has been set to either AES/EBU or S/PDIF, the EXT SYNC button will automatically turn on and disable the pitch controls (the Pitch display will read ). The EXT SYNCs clock source will be set to 48 KHz. It is possible, however, to disable the EXT SYNC button by pressing it without turning off the DIGITAL I/O button. This is not recommended, since the BRC would no longer be in perfect sync with the digital sources clock rate, which could result in clicks in the audio. For more information about sample rate conversion and interfacing the AI-1 with other digital audio equipment, please refer to the AI-1s owners manual.

CHAPTER 5: SYNCHRONIZATION, BACKUP AND MISC CONTROLS

5.0 SMPTE

5.0A SMPTE Formats
The SMPTE button may be pressed repeatedly to cycle through the various types of SMPTE that can be generated and/or synchronized to, and used for locating when SMPTE Display Type is selected. The choices are: 24 fps (frames per second), 25 fps, 29.97 fps, 29.97 fps Drop Frame, 30 fps, and 30 fps Drop Frame. The LED(s) associated with the currently selected SMPTE format will be lit solid. When the BRC is set to synchronize to an external SMPTE source, the SMPTE format of the source will automatically be detected. It is not possible to receive one SMPTE format while outputting another SMPTE format; therefore, when receiving SMPTE timecode, the SMPTE format LED will change automatically (if necessary) to correspond with the incoming format, so that both SMPTE input and output formats will be the same. Note: In the case of 29.97 and 30 fps, you will have to specify which rate is currently being received, since they are too similar for the BRC to distinguish a difference between them, due to possible source speed variations. If the SMPTE input is encoded with drop frame, the BRC will assume that 29.97 Drop Frame was intended, unless you specify otherwise.

5.0B SMPTE Start Offset

The SMPTE START OFFSET button is used to set a SMPTE start time offset for the current song. This is the SMPTE position that is to be associated with the song start position (see section 4.6A). If SMPTE is selected as the type of sync information to be generated (see section 5.0D), then this offset will be reflected in the BRCs SMPTE code output. To set the SMPTE start offset: 1. Press the SMPTE START OFFSET button; The display will show:
SMPTE Offset hh:mm:ss:ff where hh:mm:ss:ff is the offset amount (range: 00:00:00:00 through 23:59:59:29). The default is 00:00:00:00. Depending upon the current SMPTE format (see section 5.0A), the frame count will vary (0 through 23 at 24 fps, 0 through 24 at 25 fps, 0 through 29 at 30 fps and 29.97 fps). If the SMPTE format is changed, the offset value will be converted to reflect an equivalent value in the new format. 2. Use the Numeric Keypad to enter in the desired offset. The cursor will automatically advance through each pair of digits. You can also use the Cursor buttons to position the cursor beneath the pair of digits you wish to edit, and use the UP/DOWN buttons to change the number. Note: The SMPTE Start Offset can be set either by using the SMPTE START OFFSET button (as described above), or from within the Set Song or Locate Song displays while the SMPTE Display Type is selected (see section 4.6A).

5.0C External Sync

The EXT SYNC button is used to select a source to synchronize to. When this button is pressed, its LED will light to indicate the sync is from an external source. There are two types of synchronization sources: Locate Reference and Clock Source. Locate References include: Internal and SMPTE. These can be used to control the location of the BRC, without controlling the clock. Clock Sources include: Internal, 48 KHz, Video and SMPTE. These control the sample clock rate of the ADAT/BRC system. Note: Since SMPTE provides both a locate reference and a clock source, the SMPTE option exists for both types of external sync on the BRC. When synchronizing to SMPTE, it is recommended to set both the locate reference and the clock source to the SMPTE option. This provides a direct SMPTE lock. Note: When synchronizing to an external SMPTE source, the BRC will automatically detect the frame rate of the incoming signal. However, because there is only a.1% difference between 29.97 fps and 30 fps, it will be necessary for you to select the correct SMPTE

format, to ensure an accurate sample-lock. The BRC can detect whether or not Drop-Frame is being used. If you select a different SMPTE format on the BRC than what it is receiving, the result will be a transposition of the sample rate. Hence, when this problem is corrected there will be a slight change in pitch, either up or down depending on which direction the error was made. When recording digital audio from an external source (using the Alesis AI-1, for example), it is important to synchronize the clock rate of the BRC to the incoming signals source. This can usually be done by feeding a 48 KHz clock source into the BRC (see sections 2.2B, 2.5 and 4.7C). To select the type of external synchronization: 1. Press the Edit button (the EDIT button LED will go on to indicate you are now in Edit mode); 2. Press the EXT SYNC button; The display will show the current Locate Reference: Locate Reference I nternal 3. Use the UP/DOWN buttons to select either Internal or SMPTE as the Locator Reference; 4. Press the EXT SYNC button again to go to the second page. Repeatedly pressing EXT SYNC will cause the display to toggle between the two pages; The display will show the current Clock Source: Clock Source I nternal 5. Use the UP/DOWN buttons to select either Internal, 48 KHz Input, Video Input or SMPTE Input as the Clock Source; Note: If the Clock Source is set to Video Input, the SMPTE format on the BRC is automatically changed to 29.97 fps, since this is the correct SMPTE format for video. However, you can still change the BRCs SMPTE format between 29.97 fps and 29.97 fps DropFrame (see section 5.0A). You will not be able to select any other SMPTE format on the BRC while the clock source is set to Video.
6. Press the EDIT button to exit edit mode; 7. Press the EXT SYNC button to enable external synchronization. Note: The EXT SYNC button cannot be turned on until you have selected a synchronization source. If the EXT SYNC button is pressed when both the Locate Reference and the Clock Source are set to Internal, the following display will briefly appear: Must select external source Because there are so many different combinations of external and internal synchronization available, the following chart can be used to distinguish the importance of each. Locate Reference = Internal; Clock Source = Internal: This is the setup for using no external synchronization, where the BRC provides its own location and clock information, and is therefore the master of your system. This setup is equivalent to when the EXT SYNC button is off. Locate Reference = Internal; Clock Source = 48 KHz Input: This is the setup to be used when recording from an Alesis AI-1, where its 48 KHz clock signal is begin fed to the BRC. The BRC in this scenario will still use its own internal locate reference. Locate Reference = Internal; Clock Source = Video Input: Use this setup when you wish to synchronize the BRCs clock to either composite video or black-burst video sync. The BRC will automatically recognize the type of video signal (NTSC, PAL or SECAM) and its sample clock will be in sync with video, although the BRC will not be locked to the videos position. This setup is also useful when you wish to use the BRC to stripe SMPTE to the audio track of the video tape. The BRC is sample-locked to the video sync while striping the tape with SMPTE, generating 29.97 fps or 29.97 fps Drop-Frame for NTSC or 25 fps for PAL or SECAM (see section 5.0D). By striping the video tape in this manner, the SMPTE on the tape will now be frame-locked to the video frames. Locate Reference = Internal; Clock Source = SMPTE Input: This is a form of direct SMPTE lock. This is because, although the clock information is coming from a SMPTE source, the BRC ignores the locate reference and uses its own internal locate information. This can be useful when the SMPTE source has sections which suddenly jump in time (example: from 01:34:42:03 to 03:23:10:14), 72

1.0 ABOUT AI-2

The AI-2 is an extremely flexible and powerful interface device for the ALESIS ADAT 8-track digital audio tape recorder. The AI-2 is designed and manufactured for ALESIS by TimeLine, the world leader in machine control and synchronization systems. The AI-2 provides a universal ADAT control interface allowing a bank of ADAT recorders to be controlled from a video editor, a tape machine synchronizer system or in time code chase. The AI-2 supports four primary input control and two output control modes. The input control modes provide an interface to external controllers, while the output modes allow control of up to 16 ADAT recorders, with or without the Alesis BRC Remote Control.
Sample Accurate Syncing Capabilities. Using ADAT's exclusive Proprietary Synchronization interface, the AI-2 can control up to 16 ADAT's, for a total of 128 tracks, and lock them together in perfect synchronization with other time code controlled devices. Easy And Familiar Front Panel Controls. The AI-2 is fitted with a Liquid Crystal Display (LCD), 6 keys and a bank of status LED's. The keys are used to setup AI-2 system operation parameters, to select display information and to edit and control AI-2 functions. The 8 LEDs give constant control and communication status, indicating correct operation. The AI-2 controls have been designed to be quick and simple to use and will be familiar to all studio operators. Simple Installation. AI-2 installation is extremely simple, the AI-2 is a 1 Unit high product which is designed to fit into an industry standard 19" wide rack. All interface connections are made with standard connectors and the AC supply is a convenient wall mounting transformer. Connection to the AI-2 in its basic form is accomplished by a 9-pin sync cable, which connects to the first ADAT in the system and a cable to the selected controller. Successive ADATs are connected in turn -- sync out to sync in -- using the same 9-pin style connector. When the AI-2 is turned on, it automatically becomes the system master and assigns each ADAT an identification number (ID) from first to last, in the chain. The AI-2 then checks to see which machines have tapes installed and automatically locates the slave ADAT tapes to the master position.

1.2D Reference Select

The AI-2 has comprehensive reference select options, which have been structured to accommodate any possible combination of reference source, time code and sample rate. Each of the variables can be set in the REFERENCE menu. The AI-2 effortlessly handles the conversions and controls the ADAT at the correct speed.
1.2E Status LEDs and Messages
The AI-2 front panel has eight LEDs that constantly indicate system status. In addition these LEDs are programmed to flash and warn the operator if there is a problem. The AI-2 also has a display message system which gives tape status, system status and error or warning messages when they occur

1.2F Block Diagram

The following AI-2 block diagram shows how the functional blocks in the AI-2 and the physical connectors are related.
Config. Sw. Inputs MIDI In MIDI Out (MTC) Video Input RDR Input (LTC) W/C Input (48K) Aux. MIDI Port Video Sync Detector Wideband Time Code Reader
Front Panel LED Status RS422 Port Time Code Generator ADAT MIDI Port Sample Clock Generator ADAT Time Code Generator
Editor (SONY P2) Lynx-2 / Micro Lynx Gen Out In Out Thru W/C Out (48K) Sync Out ADAT BRC

AI2001A

1.3 INPUT CONTROL MODES
The AI-2 can be controlled by one of four methods. 1. The AI-2 and the attached ADATs are controlled by a video editor, or similar device, via a RS422 cable using standard Sony protocols. The AI-2 emulates the functionality of the Sony PCM7030 digital audio tape recorder. 2. The AI-2 and the attached ADATs are controlled by a TimeLine Lynx-2, Micro Lynx, or other synchronizer, using an interface cable supplied by the synchronizer manufacturer. This cable carries both control and time code information between the two devices. 3. The AI-2 and the attached ADATs chase (follow) SMPTE or EBU time code, which is fed into the AI-2's time code reader input. 4. The AI-2 and the attached ADATs are controlled by MIDI Machine Control (MMC) commands presented at the AI-2s Control MIDI Input.

1.4 OUTPUT CONTROL MODES

The AI-2 can control ADAT transports by one of two methods. 1. The AI-2 directly controls up to 16 ADAT recorders using the proprietary Alesis daisy-chain cabling technique used when multiple ADAT's are connected. The BRC Remote Control is not used. The digital audio sample rate clock (word clock) for the ADAT is generated by the AI-2. 2. The AI-2 controls the ALESIS BRC Remote Control, which is then used to directly control up to 16 ADATs. The AI-2 controls the BRC, using MIDI, word clock and time code signals.
1.5 "ENGAGED" VS. "DISENGAGED" TAPES
Analog audio recorders typically move tape past the heads between 1-7/8 and 30 inches per second. Higher play speeds result in a higher bandwidth, or the ability to record high-frequency signals on tape. ADAT digital audio signals require a much higher bandwidth than analog audio. To provide the increased bandwidth required, the ADAT uses a VHS mechanism, which has a head drum that rotates at very high speeds and records the digital audio on diagonal tape tracks. This has the same effect, as far as the head is concerned, as moving the tape at a much faster speed. With ADAT, the tape is "engaged" if the tape is not moving, but is in contact with the rotating head. This allows the ADAT to go into Play or Record, instantaneously. When the AI-2 puts the system into Still or Stop, the head remains spinning and the tape is not disengaged. When the tape is "disengaged", the ADAT head stops rotating and the tape moves away from the head -- to prolong both tape and head life. If the tape is disengaged, the ADAT will take slightly longer to go into Play or Record as the tape has to engage. This type of transport operation is identical to the operation of a normal video tape transport. The AI-2 will disengage the ADAT tape if it receives an Allstop command and will engage the tape on receiving any transport command, including Stop. The ADAT transport will automatically disengage the tape to minimize wear if no transport activity occurs after a period of 4 minutes.

2.5A SYNC OUT

The SYNC OUT connector is a 9-pin D type socket. The sync out connector is used for direct connection to the ADAT machine chain. Connect a male 9-pin D type cable from this connector to the sync in connector on the first ADAT machine. This connector supplies commands, 48 KHz clock and Alesis ADAT proprietary synchronization control information to the ADAT machines.

FRONT PANEL

SETUP SET/HOLD STORE

MENU CLEAR DOWN UP

LCD Display
AI-2 Control and Setup Keys
Control and Communication Status LEDs

Power Switch

REFERENCE CONTROL MIDI RDR IN EDITOR LYNX-2 / MICRO LYNX W/C IN VID IN IN OUT IN
CAUTION: TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
Reader Input 1/4" TRS Jack
Word Clock Out BNC Connector

REAR PANEL

BRC MIDI OUT THRU GEN OUT W/C OUT SYNC OUT ADAT
ALESIS CORPORATION, LOS ANGELES

CONFIG

MANUFACTURED BY
TimeLine Vista, Inc. MADE IN USA
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPTERATIONS.

AI2021A

9-12V AC Power Connector Video Input BNC Connector
Word Clock Input BNC Connector

Editor 9 Pin D Connector

MIDI In/Out 5 Pin Din Connector Lynx-2/Micro Lynx Synchronizer 25 Pin D Connector
BRC MIDI 5 Pin Din Connector
Sync Out 9 Pin D Connector Generator Out 1/4" TRS Jack
Eight Position Configuration Switch

3.0 AI-2 INTERFACING

The AI-2 is designed to quickly and effectively integrate the Alesis ADAT digital audio tape recorders into studio and post production facilities. The AI-2 can be used for a wide range of applications, from basic chase synchronization to full control of 16 ADAT transports from a video editor. The first diagram shows a generic configuration, indicating a number of possible applications.

AI-2 APPLICATIONS

VIDEO EDITOR ALESIS BRC Optional-See Section 3.2
VIDEO REFERENCE EXT WORD CLOCK ALESIS AI-2

REFERENCE

PUNCH IN/OUT LOCATE/PLAY

SMPTE IN

SMPTE OUT

48 kHz IN

3.2 INTERFACING TO THE BRC REMOTE CONTROL
The AI-2 can be used to control one or more ADATs through the BRC, this allows an "ADAT system" to be connected to a machine control system or video editing system. The AI-2 communicates with the control system and the BRC which can be used to provide such features as track enable buttons and MIDI song tempo mapping. The basic connections are shown below. Connect the cables between the AI-2 BRC connector section and the BRC. Two standard MIDI cables from AI-2 MIDI IN to BRC MIDI OUT, and from AI-2 MIDI OUT to BRC MIDI IN. A standard BNC to BNC coaxial cable from AI-2 W/C OUT to BRC 48 KHz IN and a mono or stereo jack plug to jack plug cable from AI-2 GEN OUT to the BRC SMPTE input. Connect the BRC REMOTE OUT TO ADAT connector to the SYNC IN on the first ADAT transport.

CONTROLLING THE BRC

Time Code Word Clock MIDI MIDI ALESIS BRC
PUNCH IN/OUT LOCATE/PLAY SMPTE IN SMPTE OUT 48 kHz IN 48 kHz OUT VIDEO SYNC IN MIDI IN MIDI OUT REMOTE OUT TO ADAT 90-250 VAC 50-60 Hz POWER ON/OFF

AI2011A

Note, that the ADAT SYNC OUT connector on the AI-2 rear panel is unconnected for this mode of operation. When all connections have been made, and the units powered on, the BRC/ADAT LED on the front panel of the AI-2 should be illuminated, to indicate that valid communication is occurring between the units. If the LED does not light (no communications) or is flashing (communication taking place, but with errors), then recheck the cable connections.
3.3 INTERFACING TO A VIDEO EDITOR
The AI-2 can be used to connect ADATs to a video editing system or other editing devices. The AI-2 provides a 9-pin SONY protocol VTR emulation for the ADAT transport. The AI-2 offers a number of editor specific functions such as selectable E-E and record field options and a comprehensive track mapping menu that maps editor track enables to selected ADAT tracks or machines. Connect a standard RS422 cable from the 9-pin EDITOR connector in the control section of the AI-2 rear panel to a control output port on the editor. Connect a video reference signal to the VID IN connector in the reference section of the AI-2 rear panel. This video reference can be either black burst, color bars or composite sync, at either video or sync levels. The AI-2 normally emulates the SONY PCM-7030 DAT recorder, if the editor does not recognize this ID then the AI-2 emulation can be set to BVU950. Consult the Appendix for further details about emulation constants.

EDITOR INTERFACE

(EXT WORD CLOCK) VIDEO REFERENCE EDITOR ALESIS ADAT

DIGITAL TRANSFER WITH THE AI-1
Word Clock In Digital I/O Digital I/O MASTER ADAT
10 dBV ANALOG INPUTS +4 dBu ANALOG OPTICAL DIGITAL DIGITAL INPUT OUTPUT dBV ANALOG OUTPUTS 7 8
10 dBV ANALOG INPUTS 8 +4 dBu ANALOG OPTICAL DIGITAL DIGITAL INPUT OUTPUT 10 dBV ANALOG OUTPUTS 7 8

ALESIS AI-1

48kHz OUT IN ADAT OUT IN SPDIF OUT IN SPDIF OUT IN AES/EBU OUT SYNC OUT

SYNC IN

60-250 VAC 50-60 Hz

AI2018A

As for all the previous methods of operation, when using external references similar precautions apply. The reference signals must be locked together. The word clock signal from the AI-1 is derived from the incoming digital audio data, this must therefore be locked to the video or synchronizer reference for the system to operate correctly.

4.0 POWER ON PROCEDURE

Each time the AI-2 is powered up it runs through a series of initialization tests and displays the current configuration. The power on routine tests all front panel for two seconds and then runs through the following display sequence where the AI-2 configuration is displayed in approximately one second steps. If it necessary to reset the AI-2 to default parameters, then press and hold the STORE key when the power is turned on.
C L E A R I NG ME M Only displayed when the STORE key is held on power up to reset the AI-2.
A LE S I S A I - 2 ad a t I n t e r f ac e

Model and Manufacturer

B y T i me L i n e
So f t wa r e Ve r s i o n A I 2 - 0 01

V i de o

Video sync source detected if connected Displays "Not Used" if the selected reference is not external video, or "Not available" if the AI-2 does not detect video sync.
V i de o Sy n c Ge n = On
Indicates that a TimeLine internal video sync generator card (VSG) is fitted, and its current status.
ad a t Re f e r e nc e E x t V i d
Displays the selected speed reference source.
S a mp l e R a t e 4 8. 0K Co n t r o l
Displays the selected sample rate.
Displays the selected control method.

S ON Y

T i me C o d e T y p e 29. 97Hz / DF
Displays the selected frame rate and time code type.

READ S TORE

FROM T A P E TO CON F I RM
Prompts to read data from the tape header. Press the STORE key to confirm and read the data or press the DISPLAY key to cancel and continue.
48. 000K 2 9. / DF L HH : MM : S S : F F.
Default display, which shows Sample rate, Frame rate and Code type, the current transport status and tape position.

4.1 ADAT ID NUMBERS

After connecting the sync cables from the AI-2 to the ADATs, turn on the ADATs, and the AI-2, the AI-2 will automatically assign ID numbers for each slave ADAT in the system. Each ADAT will momentarily display its ID number. The IDs are assigned in ascending order, in the order that the ADAT transports are connected. The first unit in the chain is assigned ID 1, the second ID 2 and so on. At any time the ADAT transport configuration is altered by added or subtracted machines from the chain the AI-2 checks the bus and reassigns ID numbers as necessary. In a multiple ADAT system power must be applied to all ADATs. If an ADAT in the middle of the chain is turned off, then the AI-2 can not communicate with the transports connected after it. If a transport is not required in the system then simply eject the tape to take the machine offline.

4.2 AI-2 CONFIGURATION

The AI-2 has a battery backed up memory system. Each time the AI-2 is turned on it will power up in exactly the same condition as when it was powered down. The first time the AI-2 is turned on the factory default settings are recalled. If any changes are made to the factory setup, they will be saved for subsequent use. After running through the power on configuration displays, the AI-2 will prompt you to read from tape. If STORE is pressed the AI-2 will rewind the first ADAT transport to the tape header and read the information from tape. If there is no information on tape then press 25
the DISPLAY key to cancel the read from tape operation. To disable the automatic power up read from tape prompt, set read tape to off in the commands menu. On initialization the default AI-2 control mode is set to auto. The AI-2 will check the control ports for communication and switch accordingly, if no communication is detected then the AI-2 will switch to reader chase mode. The AI-2 system reference, and code type and rate are then set depending on the controller type detected. The AI-2 always defaults to a sample rate of 48.000 KHz. In normal operation the sample rate, frame rate and code type are shown in the top line of the display. If required, use the AI-2 reference menu to change the default selections.
4.2A Time Code and Sample Rates
It is extremely important to understand that the ADAT transport is unlike an analog transport where time code recorded on an audio track has a fixed relationship with the program material. The ADAT is unique in that any time code type and any time code number can be selected for a piece of audio on tape. This provides great operational flexibility, but if not clearly understood can potentially lead to synchronization problems. To determine the ADAT time code position, the AI-2 reads the current digital audio sample number, or number of samples from ADAT tape zero (digital audio sample zero) from tape and calculates a time code number based on the number of samples per frame and the AI-2 time code offset. The number of samples per frame is a ratio of sample rate to frame rate. For example, at a sample rate of 48.000 KHz and a frame rate of 30 fps, the sample rate ratio is 1600, so for every 1600 digital audio samples the tape moves forward from zero, the ADAT time code position will advance by a frame. At 25 fps the sample rate ratio is 1920, so for every 1920 samples the ADAT time code position will advance a frame.

code reader input and enters it in the Offset register. To use the capture feature press and hold the STORE key and then press SET/HOLD.

5.3 COMMAND MODE

5.3A Method for Actioning Destructive Functions
Press the SETUP key to enter Setup mode. Repetitively press the MENU key to select the Commands menu, press the LAST/NEXT keys to select the Data option. Use the DOWN/UP keys to select a data read or save operation. Press SETUP to exit Setup mode, the display prompts for confirmation, press the STORE key to execute or press the DISPLAY key to cancel the command. For example:
SA VE SYS EX S TORE TO CON F I RM
The save data to tape process is not accessed through the Setup Command menu, but directly from a front panel key. To save data to tape, press the SAVE key and the STORE key to confirm. Only one command can be set at a time, because these commands are considered potentially "destructive" operations. If a command is canceled by pressing the DISPLAY key the Setup Command menu, Data option will be reset to off. All commands that are used to read or write data, require confirmation with the STORE key as a loss of valuable information could occur.

5.3B Save To Tape

Writes AI-2 data to the ADAT tape header. This command must be confirmed by pressing the STORE key as a loss of information could occur. If performed after a clear header, writes only SMPTE start times, and Tape start times, All Safe, X-fade time, Auto input, All input, Digital input, Track delay, and Pitch Control status and the Pitch value. If performed after a read tape operation will write all original unchanged data back to tape with any new changes that you have made. Data is written to all connected ADAT transports and all previously recorded data will be overwritten. To PREVENT loss of any information a Read Tape operation must previously have been performed.

5.3C Read Tape

Reads data from the first ADAT tape header. This command must be confirmed by pressing the STORE key as a loss of information could occur. The AI-2 reads and stores every piece of data in the ADAT tape header, even information that the AI-2 does not require. This permits a future Save Data operation to rewrite to tape all the original information. The AI-2 will load and use SMPTE start times, Tape start times, All Safe status, X-fade time, and Pitch Control value and status.

5.3D Clear Header

Resets the AI-2 internal header information to the AI-2 system defaults. This command must be confirmed by pressing the STORE key as a loss of information could occur. All information read from tape will be lost. This feature is used to ensure that data from a previous tape is not written to a new tape. It is recommended that a Clear Header operation be performed at the start of a new session, when there is no data on tape to read.

5.3E Abort Data Read or Save
This command is used to stop a tape or MIDI data save or read operation, once it is in progress. The command must be confirmed by pressing the STORE key. When aborting a save operation, no data will be lost, as the AI-2 retains the original data in memory. Aborting a read operation could result in invalid data in the AI-2.

5.3F Read SysEx

Reads MIDI sysex data from an external MIDI device, through the MIDI IN connector. This command must be confirmed by pressing the STORE key as a loss of information could occur.

5.3G Save SysEx

Dumps AI-2 cue data selected in the MIDI setup menu to an external MIDI device, through the MIDI OUT connector. This command must be confirmed by pressing the STORE key as a loss of information could occur.

5.4 SETUP MODE

Setup mode is used to set or modify the AI-2 operating parameters. Setup is organized in a tree type structure that has menus and submenus with selectable options. The Setup menus and options are described in detail in the Features and Controls section of this
manual. In Setup mode, the function of the front panel keys changes, as indicated by the gray italic legends to MENU, LAST, NEXT, DOWN and UP. The SETUP key toggles in and out of Setup mode, which can be entered at any time. Press the SETUP key to enter Setup mode and press the key again to exit Setup mode and return to the normal display. The top level menu structure is arranged alphabetically and in most cases the submenus are also arranged alphabetically, this however was not strictly adhered to if a more obvious or logical order was deemed necessary to simplify operation. The display in all menus except for the Cue menu is structured so that the upper line indicates, Setup: followed by "Menu name", and the lower line indicates the "submenu " and "selected value or option." For example, sample rate selection in the Reference menu is indicated as follows:
Se t up : Re f e r en c e S / Ra t e : 4 8. 0 00K
Because the Cue menu contains time codes, the submenu name is on the top line and cue number and time code are on the lower line.
Se t up : Cu e S t a r t 0 : : : 0 0
The MENU key is used to step through the top level menu list, and the LAST and NEXT keys are used to step through submenus. The DOWN and UP keys are used to adjust the submenu options or values. In some cases to simplify operation, holding the DOWN or UP keys causes the value to automatically scroll.

The AI-2 generates the digital audio sample rate clock for the ADAT transports. The AI-2 defaults to a sample rate of 48.000 KHz, five other sample rate options are available. The music CD rate of 44.100 KHz and 0.1% pull up and pull down rates for both 48 K and 44.1 K. When any rate except 48.000 KHz is selected the red Non Std LED will come on solid as a warning. In normal operation the current sample rate is displayed on the top line of the display. The sample rate is set in the AI-2 reference menu. The four 0.1% pull up and pull down options are provided to allow audio program material that was transferred at an incorrect sample rate to be corrected.

6.0 FRONT PANEL

The AI-2 front panel has a power switch, eight status LEDs, six function keys and a two row, sixteen character Liquid Crystal display (LCD) with an orange backlight. The status LEDs are used to give continual user feedback of the AI-2 operating state. When the LEDs are on, the AI-2 is operating correctly, if problems are encountered, they are indicated by flashing LEDs. The keys are used to control AI-2 functions and the display, to give detailed information and provide access to the AI-2 setup mode options.

6.1 POWER SWITCH

The power switch is used to isolate the external 10 volt AC supply. The AC supply is a standard Alesis P3 wall mounting transformer with a 3.5 mm barrel jack. Power on indication is provided by the LED backlight, which is always on when power is present.

6.2 FRONT PANEL LEDS

The AI-2 has eight status LEDs that provide the user with continuous information about the time code, reference source and communications status for the controlling devices and connected ADATs. The LEDs flash to indicate error conditions.
ONLINE LED. Lights when the ONLINE switch is pressed. When the AI-2 is online, external control commands and changes in time code position, if in time code chase, will be communicated to the connected ADAT transports. When the AI-2 is offline, the AI-2 does not control the transports and will report offline status to the controller. LOCK LED. Lights when all the connected ADATs are playing and correctly synchronized. The LOCK LED is a true lock tally and only comes on when all the ADAT transports are locked. In time code chase operation, the LOCK LED will flash if a lock error greater than 25 subframes occurs after initial lock, such as a code drop out or edited time code. NON STD LED. Lights when the AI-2 digital audio sample rate is not set to 48.000 KHz. A sample rate of 48 KHz is both the ADAT and Broadcast standard. The NON STD LED is also used to indicate that system errors or changes have occurred. 44
When a new message is added to the AI-2 error stack, the NON STD LED will flash. The messages can be viewed by pressing the STORE key and each time the STORE key is pressed the next message in the stack is displayed. When all the messages have been read, the stack is cleared and the LED stops flashing.

BRC/ADAT LED. Lights when valid communications are taking place between the AI-2 and the ADAT transports, or the AI-2 and the BRC. This LED will flash when communication errors occur. A communications error could be either bad data or an unrecognized message. MMC LED. Lights when valid communications are taking place on the MIDI IN control port on the rear panel. This LED will flash when communications errors occur. A communications error could be either bad data or an unrecognized MIDI message. CONTROL LED. Lights when valid communications are taking place on the selected control port, either the RS422 editor port or the LYNX-2/MICRO LYNX synchronizer connector. Errors in the control communications will cause the LED to flash. A communications error could be either bad data or an unrecognized serial message. REF LED. Lights when the selected external reference source is present and providing a valid reference signal. The REF LED remains off, if an internal reference is selected. The possible external references are video, word clock and time code. If the selected reference (internal or external) is not present, has lost lock or is determined to be of an unsuitable frequency, the REF LED flashes. The LTC LED. Lights when there is valid time code being received at the time code reader input.

6.3 DISPLAY

The AI-2 display is used to indicate status information such as sample rate and time code information, and in SETUP mode to enter AI-2 operational parameters. The display is also used to show context sensitive warning messages and system error messages. The upper line normally indicates the selected AI-2 time code register, and the lower line the current time code value. In setup, the display indicates the mode and menu on the upper line and the submenu and selected option on the lower line.

6.3A Tape Motion Status

Except when in setup mode, the transport status is always indicated by the first character in the lower line of the display. The following designations are used.
: : : ADAT transports in Stop.

: : : 0 0

ADAT transports are Disengaged.

ADAT transports in Play.

ADAT transports in Lock.
ADAT transports in Fast Forward.
ADAT transports in Rewind.
ADAT transports in Record.
ADAT transports in Rehearse.
ADAT transports in Search.

ADAT tapes are Ejected.

6.4 FRONT PANEL KEYS
AI-2 function control is provided by a switch matrix with six keys. These keys are used to configure the AI-2 operational parameters, and to permit the user to control basic functions and select one of a number of available time code registers to display.

7.7 GENERAL INFORMATION

7.7A Tape Header Information
The AI-2 can read and save setup and cue information to the ADAT data header. When saving information the AI-2 writes to all ADAT tapes, so it will not matter which machine the tapes are put in at a future session. When reading information the AI-2 reads from the master ADAT transport, machine number one only.

7.7B Offline

The OFFLINE key is used to release all ADAT transports from AI-2 control. The master ADAT will automatically assume control of the slave ADATs. Individual machines in an ADAT chain can be taken "offline" by ejecting the ADAT tape. The AI-2 will detect when a tape is ejected and if necessary automatically reassign the master transport. Do not power down transports in the ADAT chain to take them offline, this will prevent communication with ADAT transports further down the chain.

7.7C Assemble mode

When controlling ADAT transports from a video editor or synchronizer controller in assemble edit mode the AI-2 will automatically put the ADATs in to format extend as each edit is assembled.
8.0 APPENDIX 1: SPECIFICATIONS

8.0A Operating Codes

SMPTE (30 fps NDF) SMPTE (29.97 fps NDF) SMPTE Drop Frame (30 fps DF) SMPTE Drop Frame (29.97 fps DF) EBU (25 fps) Film Code (24 fps) Generator Output Signal Output Level Output Impedance Signal Rise Time Time Code Stability Unbalanced 1 Vpp fixed 330 ohms 4 microseconds 2 microseconds max.

8.0B Reference Sources

Internal Crystal Internal Timing External Video Sources Input Sensitivity Input Impedance External Word Clock Input range Input Level Crystal (50 ppm) 30, 29.97 (NTSC), 25 (PAL) Color bars, Black burst or Composite sync (must be terminated into 75 ohms) 0.33 - 8 Vpp 2 Kohms 48.000 KHz nominal 40.363-50.854 KHz 5 V TTL, 1 K Pull-up

8.0C Time Code Reader

Input Input Sensitivity Input Impedance Speed Range Differential Input -20 to +10 dBm >10 Kohms 1/10-60 x play speed

8.0D ADAT Synchronizer

Lock Time User Adjustment 2 to 3 seconds, nominal None

8.0E Control

Editor Interfaces Synchronizer Interface MIDI Interface Serial RS422, 38.4 Kbaud. Conforms to ANSI specification Serial RS422, 38.4 Kbaud. Conforms to ANSI specification Serial, 31.25 Kbaud. Conforms electronically to the standards specified in the MIDI 1.0 Detailed Specification.

MIDI Read Wait. A read MIDI data operation has been requested and the AI-2 is waiting for data. MIDI Save. MIDI data is being saved to an external MIDI device. MIDI Save Abort. An unsuccessful save MIDI data operation has been aborted. MIDI Save Done. A successful save MIDI data operation has been completed. No Data. A read operation has found no data to transfer. Reader Lost Lock. Time code is selected as the system reference, but due to interruption, drop outs or instability, the AI-2 has lost lock. Reader Ref Error. The time code being read at the reader input is not locked to the AI-2 system reference. Setup Read Only. Changing parameters in setup mode has been inhibited by a rear panel dip switch selection. Rec Not Locked. A record command was issued to the ADAT machine chain before all ADAT transports were locked. Reference Err. A generic message indicating that a reference related problem has occurred. This message is displayed each time any one of the specific reference lock messages is added to the error message stack. Ref Lost Lock. The internal reference or external synchronizer reference has lost lock. Ref Not Present. Selected AI-2 reference is not present. Ref Src Changed. The AI-2 reference source has changed. Reh Not Locked. A rehearse command was issued to the ADAT machine chain before all ADAT transports were locked. S/R Out of Range. The word clock signal connected to the AI-2 has exceeded the ADAT range. S/R Changed. The AI-2 sample rate has changed. Store to Confirm. Prompt for confirming commands that have a potential data loss.
System Message. System message, followed by error message, warning, condition or number. PLL Lost Lock. The AI-2 internal hardware phase lock loop has lost lock. Video = NTSC. Video sync source detected is NTSC. Video = PAL. Video sync source detected is PAL. Video Lost Lock. Video sync input has lost lock. VSG Not Locked. The video sync generator card (VSG) is not locked to the system reference. VSG Not Present. The video sync generator card (VSG) has been selected but is not fitted. VSG On. The video sync generator card (VSG) is on. VSG Off. The video sync generator card (VSG) is off. W/C Frame Err. Internal or external word clock reference for the ADAT machine has lost lock or is misframed.

8.3C Warnings

Abort Save/Read. An abort command to stop a data read or save operation has been selected, press STORE to confirm or DISPLAY to cancel. Clear Header. A clear header command has been selected press STORE to confirm or DISPLAY to cancel. Read From Tape. A read tape data command has been selected, press STORE to confirm or DISPLAY to cancel. Read SysEx. A read SysEx data command has been selected, press STORE to confirm or DISPLAY to cancel. Save SysEx. A save data to an external MIDI device command has been selected, press STORE to confirm or DISPLAY to cancel. Save to Tape. A save data to tape command has been selected, press STORE to confirm or DISPLAY to cancel.

30 NTSC PAL Film 30 fr/s 29.97 fr/s 25 fr/s 24 fr/s Monochrome TV, & audio Color videotape, TV operations European TV, European Broadcast, & audio Film cameras & projectors
HH:MM:SS:FF. Hours:Minutes:Seconds:Frames. A SMPTE time code address or value. Lock. The transport has synchronized with the system reference. LTC. Longitudinal Time Code. Time code information encoded in binary coded decimal (BCD) form which is recorded as an audio signal on a designated track of a VTR or an ATR. Machine. Machine refers to the generic concept of tape or hard disk-based record/playback hardware. MIDI. Musical Instrument Digital Interface. This serial data language is used by microprocessors in synthesizers, sequencers, drum machines, signal processors, and computers. It provides
musical pitch and rhythm information, synthesizer performance parameters, song position markers, stop/start/continue commands for sequencers and computers, and synchronizing data called MIDI Clock, which is based on 24 pulses per quarter-note. MIDI is frequently used with SMPTE for sync-to-tape functions. MIDI is transmitted between microprocessors at 32.125 KBits per second. It can also be used by lighting systems and mixing consoles. MTC. MIDI Time Code. Non Drop Frame. NDF or ND is one of the two SMPTE code types and is the black & white television standard. When using this code type, every frame of time code is counted in real time. NTSC. A system of coding color information for television transmission used primarily in the USA and Japan. Named after the National Television System Committee. Offset. Offset is the difference between two time codes at the point at which they are to be synchronized. Offsets are subframeaccurate and are displayed using the HH:MM:SS:FF format. PAL. Phase Alternate Line. PAL is another name for the 25 time code format, which is the standard for European color and B&W television. Phase Lock. A mode of synchronizer operation that uses phase information derived from SMPTE time code and after initial synchronization, ignores specific frame addresses. It is also called Sync Lock. Post-production. Activities that take place after the raw footage has been shot for a video program or motion picture. Includes video editing and a number of audio processes, such as ADR, Foley, and mixing. Production. The initial stages in the making of a film or television program, which includes the shooting of raw footage and recording of production audio. RAM. Random Access Memory. The module's configuration parameters are stored in battery-backed RAM. And recalled each time the unit is turned on. Rate. See Frame Rate or Speed.
Resolving. A technique for regulating the play speed of a tape machine by matching the rate of pulses recorded on tape with a pulse rate from another stable source or a master tape machine. Sequencer. A device that can record performance data for synthesizers and other electronic instruments and then, on playback, pass that data on to the instruments so that they'll play what has been recorded. Modern sequencers use MIDI as their communications protocol. Setup Mode. The process of defining the user-selected operational parameters, such as defining a specific mode or option. Shuttle. Fast-wind, Fast-forward or Rewind. SMPTE. Society of Motion Picture and Television Engineers. An industry standards committee. The group responsible for developing SMPTE time code. Speed. Speed, Frame Rate and Rate are synonymous. Time code speed is counted in frames-per-second (fps). SMPTE time code has two speeds: 30 fps and 29.97 fps. EBU time code is 25 fps. Film time code is 24 fps. Synchronizer. A device that reads time codes recorded on two or more tape machines, compares the codes, and adjusts the machine's tape positions and speeds based on the results of that comparison. Time Code Format. Time code format defines both the frame rate and code type being used. Example: To describe a time code format as 30 NDF is to say that the frame rate is 30 fps and the code type is non-drop frame. Simply saying either 30 or drop frame defines only part of the SMPTE time code. Time Code Generator. A special signal generator designed to generate and transmit SMPTE time code at one of the international formats and rates. Time Code Reader. A counter designed to read and display SMPTE time code. Time Code Type. The word "type" is the key to understanding this phrase. Type defines the counting method that is employed by the reader. There are two SMPTE types: 30 (also called non-drop "ND" or non-drop frame "NDF") and DF (drop frame). EBU and film types are the same as their respective speeds, 25 and 24.