Digidesign 16-channel digital interface OM 电路图.pdf

Digidesign 2001 Junipero Serra Boulevard Daly City, CA 94014-3886 USA tel: 6507316300 fax: 6507316399 Technical Support (USA) 6507316100 6508564275 Product Information (USA) 6507316102 8003332137 International Offi ces Visit the Digidesign Web site for contact information Web Site 192 I/O Guide RadioFans.CN 收音机爱 好者资料库 Copyright This guide is copyrighted 2002 by Digidesign, a division of Avid Technology, Inc. (hereafter “Digidesign”), with all rights reserved. Under copyright laws, this manual may not be duplicated in whole or in part without the written consent of Digidesign. DIGIDESIGN, AVID and PRO TOOLS are trademarks or registered trademarks of Digidesign and/or Avid Technology, Inc. All other trademarks are the property of their respective owners. All features and specifications subject to change without notice. PN 932709286-00 01/02 Communications UL1419 and Canadian CSA standard; CSA C22.2 No.1-M90. Digidesign Inc., has been authorized to apply the appropriate UL one pair of optical ports can be switched to two channels of optical S/PDIF I/O Two 24-bit-capable S/PDIF I/O supporting sample rates of up to 96 kHz Real-time sample rate conversion on inputs of eight channels of either AES/EBU, Optical, or TDIF. Word Clock input and output for synchroniz- ing 192 I/O with external Word Clock or 256x (Slave Clock) devices. Simultaneous use of up to eight 192 I/O units is supported, for a maximum of 96 channels of I/O at 96 kHz. Legacy Port for Digidesign MIX-series audio interfaces. Optional addition of cards to expand analog or digital I/O. Whats Included 192 I/O with power cable This guide DigiLink cable (1.5ft. 0.46m) BNC cable (1.5ft. 0.46m) System Requirements The Digidesign 192 I/O requires: A Pro Tools|HD system on a qualifi ed Macin- tosh OS or Windows CPU Pro Tools software, version 5.3 or higher A monitoring system (mixer, amplifi er, speak- ers, or headphones) 192 I/O Guide 2 About This Guide This guide provides a basic overview of the 192 I/Os features and functionality. Complete instructions for connecting and con- figuring your Pro Tools|HD system are located in the Getting Started with HD Guide . For additional information about using Pro Tools software to route your interface inputs and outputs to Pro Tools inputs and outputs, see the Pro Tools Reference Guide . Conventions Used in This Guide Digidesign guides use the following conven- tions to indicate menu choices and key com- mands: The following symbols are used to highlight im- portant information: ConventionAction File Save SessionChoose Save Session from the File menu Control+NHold down the Control key and press the N key Option-clickHold down the Option key and click the mouse but- ton User Tips are helpful hints for getting the most from your system. Important Notices include information that could affect your session data or the perfor- mance of your system. Cross References point to related sections in this and other Digidesign Guides. Chapter 2: 192 I/O Overview 3 chapter 2 192 I/O Overview 192 I/O Front Panel The 192 I/O has the following front panel fea- tures: Power Switch and LED Ring This button turns the 192 I/O on and off. The LED ring around the power button will light green to indicate that the unit has powered up successfully and is connected to an active HD system. If the LED ring is orange, the unit has power, but the computer it is connected to is shut down. Sample Rate These LEDs display the current sample rate of the 192 I/O internal crystal oscillator, that can be 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, or 192 kHz. The sample rate can be set when you create a new session, or in the Hardware Setup or Playback Engine dialogs if no session is open. Loop Master LED The LOOP MASTER LED indicates which HD au- dio interface is the master Pro Tools peripheral. Loop Master defaults to the first HD I/O con- nected to the HD Core card. Loop Master will al- ways be lit with a single interface. 192 I/O Front Panel 192 I/O Guide 4 Sync Mode LEDs The SYNC MODE LEDs indicate different clock source modes. Synchronization mode LEDs re- flect the Clock Source choice in Pro Tools. Only one HD I/O can be Loop Master at a time. When you change the clock source to an exter- nal clock on a particular HD I/O, that HD I/O will automatically become the Loop Master and all other HD I/Os in the chain will be switched to Loop Slave mode. The Loop Master LED will be continuously lit on the current Loop Master peripheral only, and unlit on all other peripher- als. For more information, see “Synchronization Mode and Clock Source” on page 23. Meters These four-segment LEDs indicate signal level for each of the sixteen channels. The top row of meters indicates input levels, and the bottom row shows output levels. These meters are cali- brated at 42 dB, 18 dB, 6 dB, and 0 dB, respec- tively. Note that 0 dB is not to be confused with clipping; use the on-screen meters in Pro Tools to determine whether a signal is clipping. See the Pro Tools|HD Reference Guide. Chapter 2: 192 I/O Overview 5 192 I/O Back Panel Although the 192 I/O is a 16-channel interface, it has up to 50 inputs and outputs that can be as- signed to Pro Tools channels. Installing an optional card provides even more I/O (depending on the card, you will get a total of 58, 66, or 74 inputs and outputs). See Appendix A, “Adding or Removing I/O Cards.” Input and Output Cards The 192 I/O features four bays for I/O cards. Bays 13 contain Analog In, Analog Out, and Digital I/O cards, respectively. The fourth bay is an expansion bay, for which you can purchase an additional audio card of your choice. Analog Input This section contains connectors for eight chan- nels of analog audio input with 24-bit, 192 kHz A/D converters. Two dedicated Input Trims are provided for each input channel, and there is a soft-clip limiter function that helps to avoid dig- ital clipping. See “Input Trims” on page 6, and “Soft Clip Limiting” on page 23. Input is provided through two discrete DB25 connectors, one for +4 and one for 10 opera- tion. See Appendix B, “Pinout Diagrams for the DB-25 Connectors.” +4 dBu Balanced This DB25 connector provides eight balanced input channels at +4 dBu nominal operating levels. 10 dBV Balanced This DB25 connector provides eight balanced input channels at 10 dBV nominal operating levels. Analog Input Options For each channel, you can select input level and Input Trim settings from within the Hardware Setup dialog. When you select an operating level for each in- put, you are simultaneously selecting which in- put the signal enters through. This lets you con- nect sources at both operating levels that are selectable from within Pro Tools. 192 I/O Rear Panel Bay 2: Analog Out Card Bay 1: Analog In Card Bay 3: Digital I/O Card Empty Bay for Optional Card Enclosure 192 I/O Guide 6 Input Trims Two dedicated Input Trims per analog input channel provide further calibration options and flexibility. Depending on how you utilize the two DB25 input ports, you can use the A and B trim settings for numerous applications. See “In- put Trims” on page 23. Analog Output This section contains a single DB25 connector and Output Trims for eight channels of analog audio output. These balanced outputs operate at +4 dBu levels. See Appendix B, “Pinout Dia- grams for the DB-25 Connectors.” See “About Output Levels” on page 21. Output Trims The output trims below the DB25 connector are used to individually calibrate each channels output level. Two sets of Output Trims are provided for each channel allowing you to store a second set of headroom values. This allows you to match two different headroom values for either input con- nector. See “Output Trims” on page 22. Digital I/O This section contains connectors for eight chan- nels each of AES/EBU I/O, TDIF I/O, and Optical (ADAT) I/O. Only one digital format can be used at a time. The inputs on the Digital I/O Card feature real- time sample rate conversion. For example, you can stream audio with a sample rate of 44.1 kHz into a 96 kHz session. See “Digital Format Settings and Sample Rate Conversion” on page 19. AES/EBU DB25 connectors for eight channels of AES/EBU input and output. Each of the paired channels is a balanced three-conductor signal, and supports 192 kHz sample rates in dual-wire mode. Dual-wire mode uses two of 192 I/Os physical I/O channels of AES/EBU I/O to carry each single stream of 192 kHz audio. Therefore, only four simultaneous channels of AES/EBU I/O are available at 192 kHz. TDIF DB25 connectors for eight channels of TDIF input and output. Conforms to standard eight-channel TDIF pinouts. See Appendix B, “Pinout Diagrams for the DB- 25 Connectors.” Optical (ADAT) Dedicated, eight-channel 24-bit capable Optical port. Using real-time sample rate conversion, these inputs will accept up to 48 kHz sample rates and convert them to a Pro Tools session running at up to 192 kHz. These outputs will only output at sampling rates of up to 48 kHz. Unlike the Optical port located on the enclosure, this Optical (ADAT) port is not switchable to Optical S/PDIF. For 10 dBV gear, a special DigiSnake cable (sold separately) is available. If you want to make your own cable, be sure to use in-line transformers or resistor networks to properly pad the +4 dBu output to 10 dBV levels. Most consumer electronics operate at 10 dBV levels, and may not feature bal- anced inputs and outputs. You can connect 10 dBV signals to the 10 dBV inputs, but you will need to make sure that the negative terminals are not connected. Chapter 2: 192 I/O Overview 7 Enclosure Connectors The right half of the back panel of 192 I/O fea- tures a set of non-removable connectors that are mounted to the enclosure. These connectors feature two additional chan- nels of AES/EBU I/O and another eight channels of Optical I/O. These ports are hardwired to the 192 I/O chassis and appear on-screen in the Pro Tools pop-up menus as AES/EBU Encl, and Optical (ADAT) Encl. The reference to the en- closure Encl differentiates the chassis- mounted ports from the I/O of the same types on the Digital I/O Card. Also mounted on the enclosure are two chan- nels of S/PDIF I/O on RCA connectors, synchro- nization ports and connectors for installing 192 I/) to your HD system and attaching other Digidesign I/Os. AES/EBU Encl These are balanced, three-conductor XLR con- nectors that accept and output a stereo, 24-bit AES/EBU digital data stream. These two ports support up to 96 kHz sample rates. The enclo- sure ports do not support dual-wire mode (re- quired for 176.4 kHz and higher sample rates), or provide real-time sample rate conversion (use the ports on the Digital I/O card for these fea- tures). S/PDIF Stereo I/O These are unbalanced, two-conductor RCA jacks that accept and output a stereo S/PDIF digital data stream. S/PDIF supports up to 24-bit audio, at sample rates up to 96 kHz. Optical (ADAT) Encl These are Optical ports that accept up to eight channels of Optical (ADAT) input and output, or two channels (stereo) optical S/PDIF input and output. Optical (ADAT) mode supports sample rates up to 48 kHz. In TOS-Link mode, supports two-channel Optical input and output at sample rates up to 96 kHz. This port does not feature real-time sample rate conversion. About Lightpipe-Compatible Devices Lightpipe is an industry standard, eight-channel optical digital audio connection created by Ale- sis. Lightpipe is found on many devices, includ- ing Optical (ADAT) decks, modular digital mul- titracks (MDMs), sound cards, A/D or D/A converters, and digital consoles. LOOP SYNC In and Out Loop Sync is a dedicated clock loop for synchro- nizing multiple HD-series interfaces together. Loop Sync uses a word clock signal based on sampling rates of either 44.1 kHz or 48 kHz. As sample rates increase in the system, Loop Sync continues to operate at a base rate of 44.1 kHz or 48 kHz, depending upon the higher rate. The Loop Sync In and Out ports are standard BNC connectors that output a 1x Loop Sync clock signal. Loop Sync should only be used to chain multiple HD-series peripherals together. EXT. CLOCK In and Out The External Clock I/O ports are standard BNC connectors that receive and output a word clock signal. These ports can be used to synchronize the 192 I/O to any device that requires (or pro- vides) word clock. 192 I/O Guide 8 The External Clock In port is configured by your choice for Clock Source in the Hardware Setup dialog. The External Clock Out is configured us- ing the External Clock Out selector in the Hard- ware Setup dialog. AC Power This connector accepts a standard AC power ca- ble. The 192 I/O is auto power-selecting (100V to 240V) and will automatically work with a standard modular cable to connect to AC power receptacles in any country. Primary DigiLink The Primary port is where the DigiLink cable connects from your HD Core or Process card to the 192 I/O. The Primary DigiLink port sends and receives all 32 I/O channels to and from the HD Core or Process card. As the 192 I/O is a 16- channel only device, channels 1732 are passed through to the Expansion or Legacy port. Expansion DigiLink The Expansion port is where the DigiLink cable connects an additional 192 I/O or 96 I/O to your base, or primary, 192 I/O. This port passes channels 1732 to the secondary, or expansion, I/O. Legacy Port This port is used to connect MIX-series Digide- sign audio interfaces to 192 I/O. You can con- nect two eight-channel interfaces (such as the 888|24 or 882|20) or a single sixteen-channel in- terface (1622 I/O, 24-bit ADAT Bridge I/O, or the original ADAT Bridge I/O) for expanded input and output options, using their original cables. When the Legacy port has been activated from within Pro Tools, your MIX-series I/O will ap- pear as channels 1732 in the Pro Tools mixer. To connect HD or Legacy audio interfaces, refer to the Getting Started With HD Guide . Legacy and Expansion Peripheral Port Limitations Because both the Legacy port and the Expansion port use channels 1732, you can only use one at a time. To select the Legacy or Expansion ports, refer to the Pro Tools Reference Guide . The Legacy port is not available in any session in which the sample rate is set for higher than 48 kHz. Accessory Port This port is not supported at this time. Because crucial timing data is passed through the Loop Sync and Word Clock ports, you should use high-quality, 75-ohm RG59 cables for making connections. Chapter 2: 192 I/O Overview 9 DigiLink Connections DigiLink cables make the vital connection be- tween your HD Core or HD Process card and your HD I/Os. DigiLink cables are also used to interconnect multiple HD I/Os together to ex- pand total system I/O. DigiL