ALESIS AI-2 Reference Manual
TABLE OF CONTENTS CHAPTER 1: INTRODUCTION 1.0 ABOUT AI-2 ............................................................................. 1 1.1 IMPORTANT NOTES ABOUT THIS MANUAL ....................... 3 1.2 OVERVIEW OF MAIN FUNCTIONS ........................................ 3 1.2A Multiple Control Methods.................................................. 3 1.2B Control of ADAT Functions............................................... 3 1.2C Reading and Saving Data ..............................................
CHAPTER 4: GETTING STARTED 4.0 POWER ON PROCEDURE ................................................... 24 4.1 ADAT ID NUMBERS .............................................................. 25 4.2 AI-2 CONFIGURATION .......................................................... 25 4.2A Time Code and Sample Rates ....................................... 26 4.3 SETTING THE SYSTEM REFERENCE ................................ 27 4.4 TIME CODE CHASE OPERATION ....................................... 27 4.
6.4A Normal Operation ........................................................... 47 6.4B Setup Operation .............................................................. 48 6.4C Set/Hold Operation......................................................... 49 6.5 SETUP MENUS AND FUNCTIONS ...................................... 50 6.5A ADAT Menu .................................................................... 50 6.5B Commands Menu ........................................................... 51 6.
CHAPTER 8: APPENDICES 8.0 APPENDIX 1: SPECIFICATIONS......................................... 67 8.0A Operating Codes ............................................................ 67 8.0B Reference Sources......................................................... 67 8.0C Time Code Reader ......................................................... 67 8.0D ADAT Synchronizer ........................................................ 68 8.0E Control ....................................................................
CHAPTER 1: INTRODUCTION 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.
• Storage of Setups. The AI-2 can read and write setup information to the beginning of each ADAT tape, for later retrieval. This information (tape table of contents) is in the same format as the ALESIS BRC information. The AI-2 can read existing BRC information from the tape and will use only the data that it requires. The AI-2 intelligently handles all the existing tape header data so that it can be restored to tape non-destructively.
1.1 IMPORTANT NOTES ABOUT THIS MANUAL The AI-2 is an extremely easy to use interface, and has been designed to automatically configure, depending on the control signals that are detected. Although it is possible and extremely tempting to just plug in and start working, we strongly urge that you read the chapter, Getting Started in this manual, and the sections on Formatting in the ADAT Reference manual before you start using the AI-2.
Optional-See Section 3.
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.
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.
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.
CHAPTER 2: INSTALLATION The AI-2 is a 1 unit high 19" Rack mount device. We recommend that you install the AI-2 in the same rack or close to the ADAT transports, permitting connection to the first ADAT transport with a standard ALESIS 9-pin sync cable. If it is not possible to locate the AI-2 adjacent to the ADAT, then the sync cable should be kept as short as possible because the cable carries a high frequency sample clock signal (48.000 KHz) which will degrade over distance.
2.2 REFERENCE CONNECTION The AI-2 reference connections are used to connect an external speed reference. Connectors are provided for time code, word clock and video signals. These signals are used to control the speed the ADAT machines will run at when in Play. 2.2A RDR IN The RDR IN connector is a 1/4" TRS jack. The reader input is differential with an input impedance >10k ohms and an input range of -20 to +10 dBm.
2.3 CONTROL CONNECTION The AI-2 control connections are used to connect an external controller. Connectors are provided for a video editor or similar controller, the TimeLine Lynx-2 or Micro Lynx synchronizers, and MIDI. These inputs are used to control connected ADATs through the AI-2. The reader input can also be considered a control source when the AI-2 is operating in time code chase mode. 2.3A EDITOR The EDITOR connector is a 9-pin D type socket.
2.3D MIDI OUT The MIDI OUT connector is a 5-pin din socket. The MIDI output is used for MIDI Machine Control responses (MMC), AI-2 responses and BRC responses to external commands, and for MIDI Time Code (MTC). Connect a MIDI cable to this socket when using an external MIDI controller that requires MIDI responses. 2.4 BRC CONNECTION The AI-2 BRC connections are used to connect a BRC to the AI-2. Connectors are provided for MIDI, time code and word clock.
2.4E W/C OUT The W/C OUT connector is a female BNC socket. The word clock output is a 5V TTL signal. Connect a BNC to BNC cable from this output to the BRC 48 KHz input. This connector feeds either external word clock or the AI-2 sample clock generator output to the BRC. 2.5 ADAT CONNECTION The AI-2 ADAT connection is used to connect the AI-2 to the first ADAT machine, Successive ADATs are connected in turn, sync out to sync in. This connector is not used when a BRC is configured as part of the system. 2.
13 CONFIG RDR IN W/C IN REFERENCE Eight Position Configuration Switch VID IN NEXT DOWN UP ONLINE LAST SAVE STORE CLEAR CAPTURE SET/HOLD LYNX-2 / MICRO LYNX CONTROL IN MIDI OUT AI-2 Control and Setup Keys MENU DISPLAY SETUP Editor 9 Pin D Connector Lynx-2/Micro Lynx Synchronizer 25 Pin D Connector MIDI In/Out 5 Pin Din Connector CAUTION: TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CHAPTER 3: APPLICATIONS 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 Optional-See Section 3.
3.1 INTERFACING TO ONE OR MORE ADAT'S The AI-2 is used to connect one or more ADATs to a control system. The basic ADAT connection is shown here. When the AI-2 is powered on it takes control of the ADAT chain and automatically assigns machine IDs to the connected ADATs.
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.
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.
If required, an external digital audio sample rate clock may also be connected to the W/C IN connector in the reference section of the AI-2 rear panel. For the system to operate satisfactorily, the external sample rate clock must be correctly synchronized to the video reference signal connected to the video input. When the Editor is connected and communicating correctly, the CONTROL LED on the front panel of the AI-2 should be illuminated, to indicate that valid communication is occurring between the units.
An external digital audio word clock can be connected to the reference W/C IN connector. The same precautions apply as for the video editor interface, the word clock and synchronizer system must both be locked to the same reference signal. For example, if the synchronizer system is referenced to video sync, then the word clock must also be referenced to video sync.
3.5 TIME CODE CHASE INTERFACE The AI-2 has a high resolution bi-directional time code reader that has been specifically designed for time code chase applications. The reader can read all time code types, at any rate, including discontinuous high speed code. The AI-2 thereby ensures that ADAT tape recorders can be integrated into a system when only a time code feed is available. The AI-2 reader has a wide input range and an adjustable flywheel option to cater for bad time code.
On the AI-2 front panel, the LTC LED will illuminate when valid time code is being received at the rear panel reader input. If the LED does not light or is flickering then check the time code cable or the output level of the time code source. 3.6 EXTERNAL MIDI INTERFACING MIDI MACHINE CONTROL The AI-2 can be controlled from a MIDI controller or software program that generates MIDI Machine Control (MMC) commands.
During operation the MMC LED on the AI-2 front panel illuminates to indicate valid MIDI data is being received. If the LED does not light (no communications) or is flashing (communication taking place, but with errors), then recheck the MIDI cable connections and make sure that the MIDI controller or software is actually generating MMC messages. Details of supported MIDI Machine Control commands and responses may be obtained by contacting TimeLine. 3.
DIGITAL TRANSFER WITH THE AI-1 ALESIS AI-2 REFERENCE BRC CONTROL RDR IN S/N MIDI OUT MIDI ALESIS CORPORATION, LOS ANGELES POWER W/C IN VID IN IN LYNX-2 / MICRO LYNX EDITOR OUT IN ADAT THRU GEN OUT W/C OUT SYNC OUT CONFIG MANUFACTURED BY TimeLine Vista, Inc. MADE IN USA THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
CHAPTER 4: GETTING STARTED 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.
S ON Y T i me C o d e T y p e 29 . 97Hz / DF READ S TORE Displays the selected frame rate and time code type. 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 . 9 7 / 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.
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 determines a sample rate ratio from the frame rate and sample rate options selected in the reference menu. The actual time code position is then calculated by subtracting the AI-2 offset from the ADAT tape position determined using this sample rate ratio. From this it can be seen that when either the sample rate or frame rate is changed, the sample rate ratio and therefore the tape time code position will change. As an example, if the AI-2 sample rate is altered to 44.
Connect a time code source to the reader input, the time code supplied should be between zero and forty five minutes. Put a formatted tape in the first ADAT transport and press the AI-2 ONLINE Key. Now start the time code source, the ADAT will cue to the reader time code position, go into play and lock. Press the DISPLAY key until the position error is displayed, an L and 0.00 will be displayed indicating that the ADAT transport is in perfect synchronization with the reader time code.
4.6 TRIM AN OFFSET To trim an offset press the DISPLAY key until the offset register is shown in the display. Press the SET/HOLD key, the frames digits will start to flash, press the SET/HOLD key again to select the desired pair of time code digits, then use the DOWN and UP keys to adjust the offset. When adjusting time code frames or subframes the adjustment can be made dynamically with the ADAT transports in play, so that it is possible to listen to audio as it comes into sync.
The AI-2 can be used to save status information to the ADAT tape header at the end of a session. The AI-2 transfers project information, such as code type, and most significantly the Cue start and Tape start times, this allows offsets to be automatically recalled at a future date. The information is saved in BRC format, so it can be read by either another AI-2 or the BRC. At the end of a session press the AI-2 front panel SAVE key, followed by STORE to confirm the save command.
CHAPTER 5: OPERATIONAL FEATURES 5.0 MODES OF OPERATION The AI-2 has four modes of operation, Normal, Set/Hold, Command and Setup. These modes are described in detail in this section. The AI-2 will usually be used in Normal mode. Set/Hold mode is used to modify and transfer times between registers. Command mode is used for data read and save operations and Setup mode is used to configure or modify the AI-2 operating parameters.
C UE S t a r t T i me 0 0 : 0 0 : 0 0 : 0 0 . 0 0 Only displayed when Cue menu option, Use Times is set to on. The time code displayed is for the current cue, selected in the Cue menu. If the cue start time is modified by the Set/Hold or capture process, then the start time in the Cue menu will be updated. The cue start time is normally read from the ADAT tape header and is referred to in other Alesis documentation as song SMPTE Start Offset.
Po s i t i on L L E r r o r 0 . 0 0 The ADAT transport position error. In play shows subframe error. In time code chase shows, the difference between the time code input and the ADAT or distance between master and slave. In control modes shows, difference between requested location and actual ADAT position. Read e r I np u t 0 0 : 0 0 : 0 0 : 0 0 The time code value being received at the AI-2 reader input.
5.2 SET/HOLD MODE The SET/HOLD key can be used to "capture" any time code number except the ADAT position error display register. Pressing the SET/HOLD key and holding it down continuously "holds" or freezes the display for observation for two seconds and then releases it to continue incrementing normally. This allows the user to grab and view a time code number on the fly. A momentary press of the SET/HOLD key captures the display to allow it to be altered or to enter a new time code value.
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.
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.
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.
5.5 SAVING TO TAPE The AI-2 is equipped to save information to the ADAT tape data header. The AI-2 will transmit cue start times, tape start times, pitch information and ADAT operational status such as cross fade time, all safe status and auto input status over the ADAT sync port to the ADAT machines. Press the front panel SAVE key then the STORE key to confirm the save command. This facility permits vital session data, required for synchronization, to be recalled when a tape is used at a later date. 5.
29.97 Hz/30 and if on, to 25 Hz/25. This however automatically switches if a different code type is detected at the reader input. The digital audio sample rate at the AI-2's word clock outputs is always set to the ADAT's standard operating frequency of 48.000 KHz 5.8 LONGITUDINAL TIME CODE (LTC) The AI-2 has a longitudinal time code generator which is used to supply the BRC and other external devices with LTC. The AI-2 takes the ADAT time code on tape and converts it to either SMPTE or EBU time code.
TIME CODE ALESIS AI-2 REFERENCE MIDI RDR IN S/N POWER MANUFACTURED BY BRC CONTROL ALESIS CORPORATION, LOS ANGELES W/C IN VID IN EDITOR LYNX-2 / MICRO LYNX IN OUT IN MIDI OUT THRU ADAT GEN OUT W/C OUT SYNC OUT CONFIG TimeLine Vista, Inc. MADE IN USA CAUTION: TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
The AI-2 simultaneously generates serial time code for a video editor or synchronizer, LTC, MTC and sample clock, which is sent to the ADAT transport via the SYNC OUT connector or the BRC via the W/C OUT connector. When the AI-2 synchronizes the ADAT, the time code rate, word clock rate, and the speed of the ADAT tape itself are controlled so that they are all running at one and the same rate. 5.
5.11A External Word Clock Reference The AI-2 sample rate and time code are derived from an external word clock present at the W/C in connector and one of the three "secondary" frame reference signals described below, Lynx synchronizer, video or internal. Word clock by itself does not contain frame information so the AI-2 will derive its frame rate reference by bringing its time code frames into alignment with one of the secondary references.
The AI-2 sample rate and time code are derived from a variable internal reference which is adjustable in one cent steps. The AI-2 displays the pitch variation in cents and an equivalent speed percentage read out. The range available at 48 KHz is from +100 to -300 cents. The range at other sample rate frequencies will be different, but consistent with the speed variation limits of the ADAT transport.
CHAPTER 6: FEATURES AND CONTROLS 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.
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.
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.
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. 6.4A Normal Operation In normal operation the keys have the following functions. –––––––––– – CAPTURE –––––––––– – SETUP SET/HOLD STORE DISPLAY SAVE ONLINE • SETUP.
and any current session information such as offsets back to the ADAT tape header. The save command requires confirmation with the STORE key. • ONLINE. Used to allow the AI-2 to be controlled externally. The ONLINE key is a toggle that permits the selected control source, editor, synchronizer system, time code chase or MMC to take control of the ADAT transports and receive status from the AI-2. • CAPTURE = STORE + SET/HOLD. Used to capture and automatically load an offset.
• DOWN. Moves down one submenu option or value. • UP. Moves up one submenu option or value. • CLEAR = DOWN + UP. Press the DOWN and UP keys simultaneously for 1/2 second. Used to reset or clear some AI-2 submenu options to the default setting or zero, prior to entering a new value. 6.4C Set/Hold Operation In set/hold operation, the keys have the following functions.
6.5 SETUP MENUS AND FUNCTIONS The AI-2 has a setup or configuration structure comprised of separate menus. The items in each menu are grouped by function. The following tables and descriptions explain the operation of each of the functions. The front panel MENU key is used to select a menu, the LAST and NEXT keys step through submenus and the DOWN and UP keys used to select options or modify values. The AI-2 has nine menus, ADAT, Commands, Control, Cue, MIDI, Reference, Status, System and Tracks. 6.
• Digital In. Used to switch the audio input of all connected ADAT transports to the fiber optic digital input. • Track Delay. Used to turn track delays on or off, if delays have been read from the ADAT tape header. Track delays can not be entered from the AI-2 front panel. 6.5B Commands Menu The commands menu is used to set default command operation and to issue system commands. The read and write data commands are selected in this menu.
6.5C Control Menu The Control menu is used to select the type of controller and set editor, and time code chase synchronizer options. Menu Submenu Option Description CONTROL Mode: RDR CHASE Time code chase. SONY Editor input. LYNX Lynx-2/Micro Lynx synchronizer. AUTO Detects serial communications and automatically selects controlling device. PCM-7030 "VTR" emulation (default). Emul: BVU-950 Flywheel: Time code chase system flywheel time when RDR input not present.
• Flywheel. The number of frames the AI-2 will flywheel when in time code chase. In normal operation this number should be 10 frames, which permits significant interruption to the time code input, while retaining positive transport response. The continuous option can be used when it is desired to run the ADAT transports for longer than the available input time code.
Cue times can not be edited in this menu, but if the Use Times option is set to on, they can be selected in the main display rotation and edited by the set/hold process. The cue start time is also automatically updated when the AI-2 offset is altered. If no data has been read from tape, the AI-2 will default to Cue #1. Menu Submenu CUE Use Times: Option Description Use ADAT song start time and SMPTE start offset in AI -2 offset calculation. On Off Default. Name: ABCDEFGH Cue name. (status only).
6.5E MIDI Menu The MIDI menu is used to control the MTC generator and select AI-2 data for MIDI SysEx dump. Midi information can be transferred bi-directionally from one AI-2 to another AI-2, the BRC or an external MIDI storage device. Menu Submenu Option Description MIDI MTC: On Default. Off Data: Select data for MIDI SysEx dump. Global Save ADAT header global data. Cue 1-20 Save/read selected cue data only, cue range 1-20. AI -2 Setup Save AI -2 specific setup data only.
6.5F Reference Menu The reference menu is used to select the system reference, code type and rate and the tape time output, generator modes. The AI-2 internal speed and rate computations are all determined by the options selected in this menu. Menu Submenu Option Description REFERENCE Input W/C, Lynx Word clock in and Lynx frame edge. W/C, Vid Word clock in and video frame edge. W/C, Int Word clock in and internal frame edge. Reader Time code reader input. Lynx Micro Lynx/Lynx-2 frame edge.
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• Input. Used to select the ADAT system speed reference source. The default reference selection is determined by the method of control selected in the control menu. If SONY editor is selected the reference will default to external video. If Lynx is selected the reference will default to Lynx and if time code chase is selected the reference will default to reader in. Internal variable can be selected when it is desired to run the ADAT transports at a different pitch.
sync video signal at video black level locked to the AI-2 system reference. If the option card is on then the AI-2 video input BNC is used as a video output and may be connected to the sync input of a VTR or other transport that needs to be reference to the ADAT system. 6.5G Status Menu The Status menu has three items the number of connected ADATs, the external word clock rate and the reader code type.
The tracks menu is used to select the track control method and to allocate or map tracks to editor track enables. The highest track available for track mapping is determined by the number of ADATs connected. If a track previously mapped is no longer available because the number of ADATs connected has been reduced then the selected tracks will flash to indicate that they are invalid. Track mapping is only available when the AI-2 control source is set for SONY editor control.
• Selection. Used to determine the track control method. The selections are editor control, Lynx control (which is also used for MMC track control), and local at the front panel of the ADAT transports. • Mapping. The mapping option determines the operation of the following map to, track assignment selection. Single tracks, pairs of tracks or groups of four or eight can be selected. When using Da1-Da4 track enables from the editor the AI-2 automatically maps these to A1-A4 • Map To.
CHAPTER 7: ADVANCED FEATURES Chapter seven contains information on a number of features or procedures that are not covered in other sections of the manual. Some of the information in the chapter has been included for completeness and should not be considered an advanced feature. 7.0 ADAT DIGITAL INPUT The AI-2 ADAT menu digital input option is used to select the transports input audio source.
7.1B Time Code Number Differences In certain situations there will be a slight difference between the AI-2 time code display and the time displayed on the front panel of the ADAT. This time difference is due to the fact that the ADAT transport always displays "real" time and therefore only uses four of the six possible rate/code type displays, 24/24, 25/25, 29.97/DF and 30/30. The difference comes when one of the two non-real time, rate/code type combinations 29.97/30 or 30/DF is selected in the AI-2.
If a clean MTC only feed is required, a MIDI controlling device must operate in open loop mode. 7.3B BRC Control Feed Through The AI-2 permits MIDI control and response feed through to the BRC from the MIDI input and output connectors. This is provided so that devices which are designed to control the BRC through its MIDI connectors can still do so, even though the AI-2 is now in control of the BRC MIDI connectors.
whenever SysEx information is transmitted to the AI-2 MIDI IN connector. 7.4 REAR PANEL CONFIGURATION DIP SWITCHES • Switch 1. Is used to configure the AI-2 so that after a memory clear the default settings will initialize for 25 frame operation. Once the AI-2 is configured the selected options will be retained in battery ram and used each time the unit is powered up. • Switch 2. Is used to remove internal tape length limit checking.
SW 5 OFF ON OFF ON • SW 6 OFF OFF ON ON MIDI Device ID 00 hex 29 hex 49 hex 69 hex Switches 7 and 8. Are not currently implemented and have been reserved for future use. 7.5 EXT WORD CLOCK The AI-2 will measure the frequency of an external word clock reference and display the measurement in the status menu. The AI-2 measurement has an accuracy of ±5 Hz and is intended for information and troubleshooting purposes only. 7.
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.
CHAPTER 8: APPENDICES 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 Crystal (±50 ppm) Input Sensitivity Input Impedance 30, 29.
8.0D ADAT Synchronizer Lock Time User Adjustment 2 to 3 seconds, nominal None 8.0E Control Editor Interfaces Serial RS422, 38.4 Kbaud. Conforms to ANSI specification Synchronizer Interface Serial RS422, 38.4 Kbaud. Conforms to ANSI specification MIDI Interface Serial, 31.25 Kbaud. Conforms electronically to the standards specified in the MIDI 1.0 Detailed Specification. 8.
8.0H Interconnections The connectors mounted on the rear of the AI-2 are as follows: POWER RDR IN EXT VID EXT W/C EDITOR MIDI IN MIDI OUT MIDI IN BRC MIDI OUT BRC MIDI THRU BRC LYNX-2/MICRO LYNX GEN OUT W/C OUT SYNC OUT 2.
8.1 APPENDIX 2: INTERFACE INFORMATION 8.1A Sony Editor Constants If your editor does not recognize the SONY PCM-7030 machine ID, the editor machine constants should be set as follows: Constant Values (in hexadecimal) VTR Item number PCM-7030 (30 Fr) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 70 00 00 96 05 05 03 80 0A 07 FF 00 00 5C FF Description of VTR Constant settings Item Number Setting Details of Setting 1 DEVICE TYPE (most significant byte) Specifies the VTR device type.
Item Number Setting Details of Setting 11 AFTER SYNC DELAY -- After synchronization, when changing to play mode, specifies the optimum command delay for the servo to lock in the correct position from low speed. (In frame units, correction value) 12 AFTER SYNC DELAY + After synchronization, when changing to play mode, specifies the optimum command delay for the servo to lock in the correct position from high speed.
8.1D External Word Clock The AI-2 will accept a 48k 5V TTL external word clock signal. The word clock should ideally be supplied by a high quality digital reference generator. A constant stable word clock reference is required for communication between the AI-2 and the ADAT transports. If word clock is selected as the AI-2 reference source and the reference is not connected, stops or is interrupted then the ADATs will drop off line.
8.2 APPENDIX 3: MAINTENANCE/ SERVICE INFORMATION 8.2A Cleaning First, turn the unit off and disconnect the AI-2 wall mounting power supply. Use a damp cloth, with a mild detergent to clean the front panel of the AI-2. Under no circumstances use an abrasive cleaner or chemical solvent, this will damage the front panel finish. 8.2B Maintenance The AI-2 is a solid state device that will give a life time of service with no maintenance.
8.3 APPENDIX 4: TROUBLESHOOTING Symptom Solution Front panel display does not light. The AI -2 power supply is not connected or is faulty. Check the 2.5 mm power connection and make sure that the wall transformer is plugged in properly. If this fails to correct the problem, try another power supply. The AI -2 fails to ID all the connected ADATs. Check the sync in to sync out cable connections, if necessary try swapping cables to eliminate the problem. Make sure that all ADAT transports are powered on.
Symptom Solution Reference LED flashes. The selected system reference is not present or the AI -2 can not lock to it. Make sure that the correct reference source is selected in the reference menu. Check that the reference signal is connected. Non Std LED flashes. System messages have been placed in the AI -2 message stack. Press the STORE key to view the first message, if the LED continues to flash, there is more than one message, press the STORE key until all the messages have been read.
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8.3A Tape Status Messages • All Wr Protected. A record command cannot be executed, because all ADAT tapes are write protected. • Ejected. A read data command cannot be executed because the tape in the first ADAT machine is ejected or a save data command cannot be executed because all ADAT tapes are ejected. • Reading Tape. ADAT tape header data being read from first ADAT transport. • Read/Sav In Prog. A command has been received when a read or save data operation is already in progress.
• Wr Protected. A command cannot be executed because the write protect tab has been removed from the tape. 8.3B System Status Messages • ADAT Unavailable. A tape operation has been requested and the ADAT transport is not available. • ADAT Version Err. The AI-2 has detected a version of ADAT software that is earlier than V3.05. This does not prevent operation, but synchronization performance may not be as good as it could be. • All Safe.
• 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.
• 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.
8.4 GLOSSARY 24. '24' refers to both the film-standard speed and code type. 25. '25' refers to both the EBU/PAL speed and code type. 29.97. '29.97' refers to a SMPTE frame rate only, in frames-persecond. (See Drop Frame) 30. '30' refers to SMPTE frame rate, in frames-per-second. (See Drop Frame and Non drop Frame Address. SMPTE/EBU time code address. Also referred to as time code value. A specific and unique address in the time code data stream.
Control Track. A synchronizing signal on the edge of a tape, which provides a reference for tracking control and tape speed. Digital Audio. A means of storing and transmitting sound using binary digits to replicate the audio waveforms. Display. Numeric display. Time Code/Message Display. Drop Frame. Drop frame is one of the two SMPTE code types, and is the NTSC color television standard. When using this code type, 108 specific frame numbers are "dropped" for each hour of time code. EBU.
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.
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.
Toggle. To toggle is to consecutively press a key to enable or disable a feature. Type. See Time Code Type. Video Sync. A reference video signal generated by an extremely stable source. This signal is used to control the speed of video machines, digital audio machines and is used as a timing reference to ensure accurate synchronization. Virtual Tracks. Used to describe any circumstance whereby the method for reproducing audio tracks is not directly analogous to the linear tape track format.
8.5 FCC NOTICE This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide a reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
