Dolby Laboratories DP569 User Manual
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Dolby Laboratories DP569 User Manual

Dolby Laboratories DP569 User Manual

Multichannel audio encoder
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Model DP569
Dolby Digital
Multichannel Audio Encoder
User's Manual
Issue 3
Part Number 91572

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Summary of Contents for Dolby Laboratories DP569

  • Page 1 Model DP569 Dolby Digital Multichannel Audio Encoder User’s Manual Issue 3 Part Number 91572...
  • Page 2 (including but not limited to damage to software or recorded audio or visual material), or loss of use, revenue or profit even if Dolby Laboratories or its agents have been advised, orally or in writing, of the possibility of such damages.

  • Page 3: Table Of Contents

    Chapter 4 Front-Panel Menus ... 4-1 Status Menu... 4-1 Setup Menu ... 4-2 4.2.1 4.2.2 Model DP569 User’s Manual Table of Contents Jumpers ... 2-1 Digital Input and Output ... 2-2 Front-Panel Interface ... 2-3 Contrast Adjust ... 2-3 Preset Buttons ... 2-4 Selecting Parameters ...
  • Page 4 6.2.5 6.2.6 6.2.7 6.2.8 6.2.9 Mechanical Specifications... 6-5 Environmental Specifications... 6-5 Model DP569 User’s Manual Metadata Params ... 4-4 User Presets ... 4-5 I/O Control ... 4-6 System Settings... 4-9 PC System Requirements... 5-1 Software Installation ... 5-1 Serial Cable Installation ... 5-2 DP569 Setup ...
  • Page 5 Parameter Definitions ... A-11 A.5.1 Universal Parameters ... A-12 A.5.2 Extended Bitstream Information Parameters ... A-19 Metadata Combinations ... A-22 Appendix B SMPTE Time Stamp ... B-1 Appendix C Factory Default Presets ...C-1 Appendix D Error Messages ...D-1 Model DP569 User’s Manual...

  • Page 7: List Of Figures

    Preset and Program Buttons... 2-4 Front-Panel Indicators... 2-7 DP569 Integrated with a Multiplexer ... 3-2 Connection Between a DP569 and DP572 ... 3-3 Hot-Standby Operation of the DP569 ... 3-4 DVD Encoding System Block Diagram ... 3-6 DolbyRemote Open Device Window ... 5-3 DolbyRemote Window...
  • Page 8 Rear Panel Remote Control Serial Port Pin-Outs ... 6-3 Front Panel Remote Control Serial Port Pin-Outs... 6-4 General Purpose Control Input Port Pin-Outs ... 6-4 General Purpose Status Output Port Pin-Outs... 6-5 Mechanical Specifications... 6-5 Environmental Specifications ... 6-5 Model DP569 User’s Manual List of Tables viii...

  • Page 9: Regulatory Notices And Fuse Information

    • The core that is coloured brown must be connected to the terminal that is marked with the letter L or coloured red. • This apparatus must be earthed. Model DP569 User’s Manual or coloured green or green and yellow.
  • Page 10 Model DP569 User’s Manual This equipment complies with the EMC requirements of EN55103-1 and EN55103-2 when operated in an E2 environment in accordance with this manual. IMPORTANT SAFETY NOTICE This unit complies with the safety standard EN60065. The unit shall not be exposed to dripping or splashing and no objects filled with liquids, such as coffee cups, shall be placed on the equipment.

  • Page 11: Fuse Information

    Do not force the carrier into the compartment or both could be damaged. 3. Snap the fuse compartment door closed. Model DP569 User’s Manual VIKTIGA SÄKERHETSÅTGÄRDER! Fas—Brun Neutral—Blå Jord—Grön/Gul Fase—Bruin Nul—Blauw Aarde—Groen/Geel...

  • Page 12: Internal Fuse

    Model DP569 User’s Manual Checking the Main Fuse Internal Fuse The switching power supply contains a separate fuse. Most fault conditions should be protected by the main fuse. If you find it necessary to replace the internal fuse, be certain to replace it with a fuse of the same...

  • Page 13: Chapter 1 Introduction

    DVD and other recorded media. The DP569 provides three pairs of AES3 digital audio inputs and a single AES3 output. A separate AES3 input may be used for a clock reference signal. Previously encoded Dolby Digital audio bitstreams pass through unchanged—automatically, if...

  • Page 15: Chapter 2 Setting Up

    2.2.1 Jumpers The Model DP569 allows you to choose options that are configured by internal jumpers. Factory default settings are shown in Figure 2-1, these are suitable for most installations. To gain access to these jumpers, remove the top cover of the unit as follows:...

  • Page 16: Digital Input And Output

    2.2.2 Digital Input and Output The digital input and output connections on the DP569 may seem unfamiliar to the first time user of a digital audio device. The Audio Engineering Society (AES) created a standard electrical interface for digital audio with a balanced XLR connector and 110Ω...

  • Page 17: Navigation Buttons

    Front-Panel Interface The menu system has two independent structures: setup and status. The setup menu lets you configure the DP569 to suit your environmental and program requirements, and the status menu displays information regarding the operating status and the condition of input signals.

  • Page 18: Preset Buttons

    Model DP569 User’s Manual 2.3.3 Preset Buttons The second group of buttons allows you to quickly select existing presets. To select a preset, press the appropriate Preset button. A table of factory default presets can be found in Appendix C. Presets 28–32 are copied to presets 1–5 when shipped from the factory.

  • Page 19: Selecting Parameters

    Model DP569 User’s Manual Command ← or ↑ Displays the previous menu item available on line 2 of the display. ↓ or → Displays the next menu item available on line 2 of the display. Enters the menu item on line 2 of the display; changes function Enter status and menu display accordingly.

  • Page 20: Entering Text

    Model DP569 User’s Manual 2.5.2 Entering Text In certain situations you will be prompted to enter text. In the text entry window, the first line prompts you to enter text. The second line displays the current text for the parameter or, if no text is yet defined, a default text string. An underline cursor appears under the first character in the string.

  • Page 21: Front-Panel Indicators

    PSU or processor/memory fault. No operational errors are detected by the DP569. Error One or more operational errors are detected and the DP569 output is not valid. Normal operation. Test Test tone output is enabled. Audio from the system inputs is ignored.

  • Page 22: Channel Activity Leds

    Model DP569 User’s Manual State The Ref In input is not selected. Ref In Green The Ref In input is required and locked without errors. The Ref In input is required, but invalid or not present. Remote interface is disabled.

  • Page 23: Chapter 3 Applications

    TV station (for example, the levels, dynamic range, peak levels, and so forth). Consequently, all audio must conform to these characteristics before it reaches the DP569 in order to match these metadata settings. This is similar to the requirements of analog or MPEG digital transmissions, where the audio system has fixed characteristics and the program audio is conformed to match.

  • Page 24: Integration Within A Dolby E System

    Use a standard DB9 male-to-male cable (not a null modem) to connect the Metadata output on the DP572 decoder to the Metadata input on the DP569. It is possible to connect one DP572 to many DP569 units by simply cascading the metadata connection.

  • Page 25: Metadata Reversion

    2. Equipment failure within the broadcast audio chain. When a DP569 (or Dolby E products) does not receive metadata, it will revert to a set of preconfigured metadata parameters. This reversion behavior can be used as part of a systems design to apply the correct metadata values in case 1 above as well as providing suitable values in case 2.

  • Page 26: Alarms And Monitoring

    Model DP569 User’s Manual 3.1.5 Alarms and Monitoring The DP569 has a bypass input that can be used for redundant or hot standby operation. In order to connect a pair of DP569 for hot standby, the following connections should be made.

  • Page 27: Dvd Authoring

    3.2.1 Overview The DP569 can be used as part of an integrated system for encoding audio for DVD applications. The system consists of the following hardware and software: • PC computer running Windows with a suitable digital I/O soundcard installed (A list of soundcards is available at www.dolby.com.)

  • Page 28: Quick Start For Dvd Authoring

    DP569 using terminations as required. See Section 2.2.2 and 4.2.5, Digital Audio Inputs. 2. Install the soundcard in the PC and connect the main output of the DP569 to the digital input of the soundcard. 3. Install and calibrate the DP562 Dolby Digital decoder as shown in Figure 3-4 and described the DP562 user’s manual.
  • Page 29 6. Recall factory preset number 2 (copied in preset 29) from the front panel; this configures the unit to generate all metadata settings internally. 7. Place the DP569 in remote mode by sequentially pressing shift and ← keys. 8. Launch the DolbyRemote software and connect to the DP569. See Section 5.3.
  • Page 30 Model DP569 User’s Manual...

  • Page 31: Chapter 4 Front-Panel Menus

    “P” indicates preset; “L,” last used; and “A,” adaptive reversion modes. An asterisk indicates that parameters are being overridden. • Errors menu • Firmware version Model DP569 User’s Manual Front-Panel Menus Encoder Status 3/2L 448 48 27 0...

  • Page 32: Operating Mode

    • User Presets • I/O Control • System Settings 4.2.1 Operating Mode In this menu you control whether the DP569 is encoding, and whether it is being controlled by timecode. The submenus are: • Encoder Control • TC Start Time •...

  • Page 33: Metadata Control

    The time stamp must be enabled for timecode to exist in the bitstream. For further information, see Appendix B. 4.2.2 Metadata Control This menu controls the source for metadata for the DP569 and what to do in the situations where the metadata disappears. The submenus are: • Metadata Source •...

  • Page 34: Metadata Params

    Model DP569 User’s Manual • Adaptive behaves like Last Used if the metadata disappears completely; behaves like Preset if any individual metadata parameters are missing. 4.2.3 Metadata Params This menu contains 30 metadata parameter selection menus. Table 4-1 provides a basic definition for each of the metadata parameters available, listed by the text shown on the front-panel display.

  • Page 35: User Presets

    Model DP569 User’s Manual When the stereo downmix is Lt/Rt, designates downmix level for center channel Lt/Rt C Dwnmx when end user has no center speaker. When the stereo downmix is Lt/Rt, designates downmix level for surround Lt/Rt S Dwnmx channels when end user has no surround speakers.

  • Page 36: I/O Control

    • If the unit is in Timecode Control mode, it cannot also recall a preset based on timecode. 4.2.5 I/O Control In the I/O Control menu you can set the configuration of the DP569’s inputs and outputs. The submenus are: • Input Channels •...

  • Page 37: Input Format

    Time Stamp Delay Word If enabled each Dolby Digital audio frame will be preceded by a data packet that reports the current delay through the DP569 encoder. This is used in some broadcast multiplexers to adjust A/V timing to maintain lipsync. Options are included to offset the current delay value carried in this data packet, or override the current value with a user-defined value.

  • Page 38: Timecode Input

    TTL delay input. This control only affects the coding latency through the DP569, it does not affect the time stamp values if enabled. The minimum allowable coding delay at each sample rate is shown in Table 4-2.

  • Page 39: System Settings

    8–F, and the other characters are restricted to 0–F. The last character must be even. Unit Name Assign any text name you wish to your DP569; this is displayed on the top line of the main status menu. Test Tone Activates an internally generated test signal as the input to the encoding process rather than the currently selected input signal.
  • Page 40 Model DP569 User’s Manual...

  • Page 41: Chapter 5 Dolbyremote

    DolbyRemote Overview The DolbyRemote application, version 2.01, is used to remotely control the DP569. Key features of the software include: • Offline mode, without the presence of a unit, to create and edit parameter files. • Save a unit configuration in a file on a PC. Restore the unit’s configuration from a saved DolbyRemote file.

  • Page 42: Serial Cable Installation

    Each RS-232 port on a PC must be connected to a single DP569; the application can, however, control many RS-232 ports. For example, with five free RS-232 ports on a computer, five DP569 devices may be controlled with a single instance of the DolbyRemote application.

  • Page 43: Dp569 Setup

    5.2.4 DP569 Setup To operate using DolbyRemote it is necessary to place the DP569 into remote mode. Press Shift, ←to access remote mode. Starting DolbyRemote From the Windows Start button, select DolbyRemote from the folder in which you installed the DolbyRemote application.
  • Page 44 DolbyRemote Baud Rate The communication baud rate for the DP569 may be set to 9,600, 19,200, or 38,400 (the default rate). The baud rate is configurable through the front panel of the encoder. The rate you select in DolbyRemote must match the rate selected in the unit.

  • Page 45: Adding Or Removing Additional Devices

    DolbyRemote can save the configuration of the active device so that it can easily be recalled later. The file extension for these configurations is .dby and can only be read with DolbyRemote. Configurations can be transferred between different DP569 encoders, using this function.

  • Page 46: Display Overview

    Verify that the baud rate and device address of the unit to be controlled match the parameters given to the DolbyRemote application in the Open Device window. On the unit, these parameters are found in the System Settings section of the DP569 setup menu.

  • Page 47: Audio Service Parameters

    Model DP569 User’s Manual 5.6.1 Audio Service Parameters Input Meters show the input level of the channels enabled in the current encoding mode in dBFS. Audio Bandwidth displays the current audio bandwidth of the main channels. This is dependent on the number of channels being encoded and the data rate.

  • Page 48: Preprocessing

    Model DP569 User’s Manual • Stopped: The user has directed the unit to not encode. 5.6.2 Preprocessing Input Level Meter shows the input signal used by the dynamic range control process to determine the amount of boost or cut required.

  • Page 49: Dual Mono

    Model DP569 User’s Manual 5.6.4 Dual Mono These fields are only applied when the coding mode is set to 1+1. In this case, these parameters apply to channel 2. 5.6.5 Input and Output Settings and Reference Input Figure 5-8 Dual Mono Tab...

  • Page 50: Presets

    Model DP569 User’s Manual Lock Status shows whether the input channels have been detected and locked by the encoder. Sample Rate shows the sample rate of the input channels. Integrity shows the data integrity of the input channels. Input Subcode Status Bits show the format, sample rate, emphasis, and audio bit as indicated in the subcode of the input signal.

  • Page 51: Save Current Configuration

    Model DP569 User’s Manual Click on any of the 32 preset buttons to recall a user preset. These presets are stored internally within the decoder, not within the DolbyRemote application. Configure Number selects the number of the present you wish to configure, 1 through 27.
  • Page 52 Model DP569 User’s Manual...

  • Page 53: Chapter 6 Specifications

    = data = clock Model DP569 Metadata Digital Audio Encoder Linear Time Main Code In Remote Switched Dolby and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. RS-485 SMPTE LTC In SMPTE VITC In Front (RS-232) Rear (RS-422)

  • Page 54: Digital Audio Connections

    Model DP569 User’s Manual 6.2.1 Digital Audio Connections Inputs (Digital In 1/2, 3/4, 5/6), Reference Digital Input (Ref In), Bypass Digital Audio Input (Bypass In) BNC female connectors per AES3ID-1995 Outputs Main Digital Audio Output (Main Out), Switched Digital Audio Output (Switched Out) BNC female connectors per AES3ID-1995 6.2.2...

  • Page 55: Metadata Serial Port

    Model DP569 User’s Manual 6.2.5 Metadata Serial Port 9-pin female D-connector, electrical specifications per SMPTE 207M 6.2.6 Rear Panel Remote Control Serial Port (Remote) 9-pin female D-connector per SMPTE 207M Table 6-3 Rear Panel Remote Control Serial Port Pin-Outs Table 6-2 Metadata Serial Port Pin-Outs...

  • Page 56: Front Panel Remote Control Serial Port (Remote)

    Model DP569 User’s Manual 6.2.7 Front Panel Remote Control Serial Port (Remote) 8-pin female mini-DIN connector, electrical specifications per EIA RS-232 Table 6-4 Front Panel Remote Control Serial Port Pin-Outs 6.2.8 General Purpose Control Input Port (GPI/O In) 9-pin female D-connector, 5 V CMOS input levels (active low)

  • Page 57: General Purpose Status Output Port (Gp I/O Out)

    Model DP569 User’s Manual 6.2.9 General Purpose Status Output Port (GP I/O Out) 9-pin female D-connector, 5 V CMOS output levels (active low) Table 6-6 General Purpose Status Output Port Pin-Outs Connection Fault Not Locked Pass-through Encoding User Preset 1...
  • Page 58 Model DP569 User’s Manual...

  • Page 59: A.1 Metadata Overview

    Dolby E is a distribution bitstream capable of carrying up to eight channels of encoded audio and metadata. The number of programs ranges from one single Model DP569 User’s Manual A–1 Appendix A Metadata...
  • Page 60 Model DP569 User’s Manual Metadata program (Program Config: 5.1) to eight individual programs on a single Dolby E stream (Program Config: 8 × 1). Each program is discrete with its own metadata in the Dolby E stream. Some control metadata parameters in a Dolby E stream automatically configure a Dolby Digital encoder while others are passed through to the consumer’s Dolby Digital decoder.
  • Page 61 Model DP569 User’s Manual Program Source 5.1-Channel Program Multichannel Audio in 5.1+2 Program Config Two-Channel (Stereo) Program Decoded Dolby E bitstream delivers both the 5.1- and two-channel programs’ encoded audio along with corresponding metadata. DP572 Dolby E Decoder Figure A-1 Metadata Flow from Production to Consumer...

  • Page 62: A.2 Dialogue Level

    Model DP569 User’s Manual Both types of metadata can be examined, modified, or passed through during encoding. Table A-1 lists the active metadata parameters and indicates if each parameter is informational or control. Extended Bitstream Information parameters are in italics.
  • Page 63 Model DP569 User’s Manual When received at the consumer’s Dolby Digital decoder, this parameter setting determines the level shift in the decoder that sets, or normalizes, the average audio output of the decoder to a preset level. This aids in matching audio volume between program sources.

  • Page 64: Dynamic Range Control

    Model DP569 User’s Manual The most important point to remember is that in setting the dialogue level parameter, you are providing your listener with an essential service. For your listeners, setting this level properly means: • The volume level is consistent with other programs.

  • Page 65: Line Mode

    Model DP569 User’s Manual Note: While the use of DRC modes during decoding is a consumer-selectable feature, the dialogue level parameter setting is not. Therefore, the proper setting of the dialogue level parameter is essential before previewing a DRC profile.

  • Page 66: Dynamic Range Control Profiles

    Model DP569 User’s Manual A.3.3 Dynamic Range Control Profiles Six preset DRC profiles are available to content producers: Film Light, Film Standard, Music Light, Music Standard, Speech, and None. Each is applied in the pattern shown in Figure A-2. All DRC profiles are encoded using a modified B-weighted curve.

  • Page 67: A.4 Downmixing

    Model DP569 User’s Manual • Music Standard Max Boost: 12 dB (below –55 dB) Boost Range: –55 dB to –31 dB (2:1 ratio) Null Band Width: 5 dB (–31 dB to –26 dB) Early Cut Range: –26 dB to –16 dB (2:1 ratio) Cut Range: –16 dB to +4 dB (20:1 ratio)
  • Page 68 Model DP569 User’s Manual It is important to consider the output signals from each piece of equipment that can receive a Dolby Digital program in the home. Table A-2 shows the output types from different equipment. Table A-2 Outputs from Various Dolby Digital Signal Processing Equipment Equipment 5.1-channel amplifier...

  • Page 69: A.5 Parameter Definitions

    Model DP569 User’s Manual stereo hi-fi or on headphones, and from which a mono signal is derived for use on an RF/Antenna output. The difference between the downmixes is how the surround channels are handled. The Lt/Rt downmix sums the surround channels and adds them, in-phase to the left channel and out-of-phase to the right channel.

  • Page 70: Universal Parameters

    Model DP569 User’s Manual A.5.1 Universal Parameters Universal parameters are present in all Dolby Digital encoders and decoders. Dialogue Level The Dialogue Level parameter is discussed in Section A.2. Channel Mode This parameter (also known as audio coding mode) indicates the active channels within the encoded bitstream and affects both the encoder and consumer decoder.

  • Page 71: Bitstream Mode

    Model DP569 User’s Manual whether the LFE Channel parameter can be set. You must have at least three channels in order to be able to add an LFE channel. Bitstream Mode This parameter describes the audio service contained within the Dolby Digital bitstream.
  • Page 72 Model DP569 User’s Manual Bitstream Mode Setting This is typically a single-channel program intended to convey additional commentary that can be optionally decoded along with the Main Audio Service. This service Assc. Commentary differs from a Dialogue Service because it contains an optional, rather than a required, ©...
  • Page 73 Model DP569 User’s Manual Center Downmix Level When the encoded audio has three front channels (L, C, R), but the consumer has only left and right front speakers, this parameter indicates the nominal downmix level for the center channel with respect to the left and right channels. Dolby Digital decoders use this parameter during downmixing in Lo/Ro mode when Extended BSI parameters are not active.
  • Page 74 Model DP569 User’s Manual Dolby Surround Mode Setting Not Dolby Surround default Dolby Surround Not Indicated Audio Production Information This parameter indicates whether the mixing level and room type values are valid. If Yes, then a receiver or amplifier could use these values as described below. If No, then the values in these fields are invalid.

  • Page 75: Lowpass Filter

    Model DP569 User’s Manual Copyright Bit This parameter indicates whether the encoded Dolby Digital bitstream is copyright protected. It has no affect on Dolby Digital decoders and is purely for information. Original Bitstream This parameter indicates whether the encoded Dolby Digital bitstream is the master version or a copy.
  • Page 76 Model DP569 User’s Manual frequency signals that are not encoded. At the suitable data rates this filter operates above 20 kHz. In all cases it prevents aliasing on decoding and is normally switched on. This parameter is not passed to the consumer decoder.

  • Page 77: Extended Bitstream Information Parameters

    A.5.2 Extended Bitstream Information Parameters In response to requests from content producers, Dolby Laboratories recently modified the definitions of several metadata parameters from their original definition as described in ATSC document A/52. The original parameters were rarely, if ever used.
  • Page 78 Model DP569 User’s Manual Lt/Rt Center Mix Level This parameter indicates the level shift applied to the center channel when adding to the left and right outputs when downmixing to an Lt/Rt output. Its operation is similar to the center downmix level in the universal metadata.
  • Page 79 Model DP569 User’s Manual Lo/Ro Surround Mix Level This parameter indicates the level shift applied to the surround channels when downmixing to a Lo/Ro output. When Extended BSI parameters are active, this parameter is used, and the Surround Mix Level parameter in the universal parameters is not.

  • Page 80: A.6 Metadata Combinations

    Model DP569 User’s Manual A/D Converter Type This parameter allows audio that has passed through a particular A/D conversion stage to be marked as such so that a decoder may apply the complementary D/A process. Metadata Combinations Table A- provides examples of combinations of parameters that could be used as a preset.
  • Page 81 Model DP569 User’s Manual Extended Bitstream Information parameters are in italics. Action Film Parameter Room type Copyright Original Bitstream Preferred Stereo Downmix Lt/Rt Center Downmix Level Lt/Rt Surround Downmix Level Lo/Ro Center Downmix Level Lo/Ro Surround Downmix Level Dolby Surround EX...
  • Page 82 Model DP569 User’s Manual A–1...

  • Page 83: Appendix B Smpte Time Stamp

    Model DP569 User’s Manual Appendix B SMPTE Time Stamp An edited excerpt from Annex B of ATSC Document A/52 (“Digital Audio Compression Standard (AC-3)”) is reproduced below. The Time Stamp Data_type Time stamps are useful in applications where time information must be kept closely associated with encoded audio data (see Figure B-1).
  • Page 84 Model DP569 User’s Manual timecode values to occur within a single audio access unit. In this case, the timecode value that applies to the earliest sample in the access unit is used. It should be recognized that the time stamp values will have a small amount of inherent jitter.

  • Page 85: Appendix C Factory Default Presets

    Enabled Input Chan Assign L/R C/LFE Ls/Rs Clock Source Digital Input Input Format Output Stream # Output Mode Pro 32-bit Model DP569 User’s Manual Factory Default Presets Stereo Film Stereo Music –27 dB –27 dB 2/0 Stereo 2/0 Stereo Disabled...
  • Page 86 Model DP569 User’s Manual Preset Number Preset Name Externl Metadata Time Stamp Disabled TS Delay Word Disabled Audio Bit Non-Audio Timecode Input Mono Channel Center Multiplex Mode Disabled Coding Delay Bypass Mode Disabled Encoder Control Encode TC Start Time 00:00:00:00:0000...

  • Page 87: Appendix D Error Messages

    Model DP569 User’s Manual This appendix lists possible error messages that may be generated by the DP569. In each case a description of possible setup conflicts are given that may have caused the error. When a conflict occurs the parameter that caused the conflict will not be updated but returned to its original value once the error message has been displayed.
  • Page 88 Model DP569 User’s Manual • Ref In-SRC On or an Internal Clock Source has been selected and the current Input Format is not PCM. • Time Code Ctrl has been selected as the Encoder State and the current Input Format is not PCM.
  • Page 89 Model DP569 User’s Manual • Internal 44.1 kHz has been selected as the Clock Source and the current Coding Delay is Internal with a delay value less than 204 ms, or Internal 32 kHz has been selected and the current delay value less than 280 ms.
  • Page 90 Model DP569 User’s Manual D–1...

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