Dolby Laboratories DP524 User Manual
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Dolby Laboratories DP524 User Manual

Dolby Laboratories DP524 User Manual

Two-channel ac-2 / ac-3 digital audio decoder
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Model DP524
Two-Channel AC-2 / AC-3
Digital Audio Decoder
Users' Manual
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Summary of Contents for Dolby Laboratories DP524

  • Page 1 Model DP524 Two-Channel AC-2 / AC-3 Digital Audio Decoder Users' Manual MAIN...
  • Page 2 MAIN...
  • Page 3 Dolby Laboratories be liable for incidental, special, direct, indirect or consequential damages (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 4 MAIN...

  • Page 5: Table Of Contents

    SECTION 1 Introduction 1.1 Introduction ... 1-1 1.3 Dolby AC-3 and AC-2... 1-2 1.4 Data Rates, Sample Rates and Channels ... 1-3 1.5 Regulatory Notices ... 1-4 SECTION 2 Applications SECTION 3 Pre-Installation 3.1 Unpacking... 3-1 3.2 Inspection ... 3-1 3.2.1 Claims for Shipping Damage ...
  • Page 6 SECTION 6 Interface Specification and Description 6.1 DP524 Interface Specifications ... 6-1 AES/EBU Digital Audio Output, J101 ... 6-1 S/PDIF Digital Audio Output, J102 ... 6-1 Encoded Data In and Timing, J103, 37-pin D-connector:... 6-1 Status / Control, J104, 25-pin D-connector:... 6-2 RS-232 Port, J105 ...

  • Page 7: Section 1 Introduction

    INTRODUCTION Introduction The Dolby Model DP524 is a digital audio decoder unit supporting both Dolby AC- 2 and Dolby AC-3 digital audio coding algorithms. The unit supports up to two channels of audio. The data rates available are considerably lower than that required to convey conventional PCM data (between 40k and 384k bits/sec) yet provide exceedingly high audio quality.

  • Page 8: Dolby Ac-3 And Ac-2

    Features Automatic algorithm, data rate and sample rate selection Dolby AC-3 audio coding algorithm from 40 kbps - 384 kbps Mono, Dual-Mono or Stereo modes for AC-3 Dolby AC-2 audio coding algorithm from 128 kbps - 384 kbps Mono 2-channel modes for AC-2 Analog outputs with 20-bit D/A converters Digital outputs (AES/EBU and S/PDIF) Software download capability for software upgrades...

  • Page 9: Data Rates, Sample Rates And Channels

    Data Rates, Sample Rates and Channels Possible AC-3 Data Rates, Sample Rates and Number of Channels Data Rate 40 kbps 48 kbps 56 kbps 64 kbps 80 kbps 96 kbps 112 kbps 128 kbps 160 kbps 192 kbps 224 kbps 256 kbps 320 kbps 384 kbps...

  • Page 10: Regulatory Notices

    Regulatory Notices 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 reasonable protection against harmful interference when the equipment is operated in a commercial environment.
  • Page 11 IEC NOTICES IMPORTANT SAFETY NOTICE This unit complies with the safety standard IEC65. To ensure safe operation and to guard against potential shock hazard or risk of fire, the following must be observed: Ensure the voltage selector is set to the correct mains voltage for your supply. Ensure fuses fitted are the correct rating and type as marked on the unit.
  • Page 12 MAIN...

  • Page 13: Section 2 Applications

    The Dolby Model DP524 is suitable for a variety of point-to-point and point-to- multipoint digital transmission applications, including cable, telecommunications and satellite or terrestrial microwave links. The very high audio quality and low, spectrum-efficient data rates of the AC-2 and AC-3 coding process make them particularly appropriate for these applications.
  • Page 14 MAIN...

  • Page 15: Section 3 Pre-Installation

    To reduce the risk of fire, replace fuses only with the same type and rating. The DP524 utilizes a universal switching power supply that can accommodate the full range of nominal voltages between 90 Vac and 264 Vac and any frequency between 50 Hz and 60 Hz.

  • Page 16: Internal Fuse

    Any jumpers not specifically mentioned are for factory use only and should not be disturbed. If you need to gain access to the interior of the DP524 to change these jumpers, proceed as follows: WARNING Be sure that the unit is NOT powered up.
  • Page 17 Reverse the above procedure when re-assembling the unit. S101 Note: Jumpers J200, 201, 202, 203,204 are not applicable to this product and should not be disturbed. Leave them in the positions shown. DP524 MOTHERBOARD J103 J105 J205 J200 J202 J204...

  • Page 18: Jumpers For Encoded Data In & Timing (J103)

    To connect audio ground directly to chassis ground in the DP524, move jumper J3 to the closed position (move jumper towards the front of the unit).

  • Page 19: Switch Nos. 1, 7 & 8 - Test Tone

    Note Switch positions 5 and 6 take on two roles: They set the Aux Data output baud rate when S101-2 is in the Normal position and S101-4 is in the Aux Data position They set the Download baud rate when S101-2 is in the Download position. Their positions are immaterial when S101-2 is in the Normal position and S101-4 is in the Command position;...

  • Page 20: Switch No. 3 - Digital Output Format Selection

    3.5.3 Switch no. 3 - Digital Output Format Selection Position this switch to corresponds to the type of digital output signal format. Refer to Section 4 for information regarding audio connections. Format S/PDIF AES/EBU The switch setting selects how the digital bit stream is marked. S/PDIF is synonymous with "consumer"...

  • Page 21: Section 4 Installation

    Mounting The DP524 is designed for 19 inch rack mounting, but may be mounted in any plane and with any orientation. It occupies 1U (1 3/4") of space. When mounting the unit, ensure that there is air flow around it, and that it is not mounted directly above any equipment generating high amounts of heat.

  • Page 22: Data, Status, And Remote Control Connections

    (connecting the wire to pin 3 to ground) occurs only at the end remote from the Model DP524. Note that both audio pins of the XLRs (pins 2 and 3) must be connected; neither may be left open.

  • Page 23: Rs-422 (J106)

    Baud Rate 1200 2400 9600 Where is baud rate of the Encoder (generating the Aux data stream) is higher than the baud rate of the Decoder it is possible that data may be lost. 4.3.3 RS-422 (J106) The RS-422 connection is not supported in this product. 4.3.4 Parallel Status and Control (J104) It is possible to remotely enable the Test Tone and Download functions:...
  • Page 24 MAIN...

  • Page 25: Section 5 Operation

    Fault The Fault LED indicates power supply or processor/memory failure. Upon power- up of the DP524, the internal processor performs a diagnostic check of all memory locations and verifies that processor clock signals are active. Failure of any of these tests is indicated by the illumination of this LED.

  • Page 26: Rear Panel Level Controls

    (at full scale) over a range of below 0dBu to greater than +24dBu. Test Tone Level The operating level for the test tone generator of the Model DP524 is -18dB relative to full scale. This is useful when calibrating the analog outputs and also for checking proper operation of the digital outputs.

  • Page 27: Section 6 Interface Specification And Description

    INTERFACE SPECIFICATION AND DESCRIPTION DP524 Interface Specifications AES/EBU Digital Audio Output, J101 XLR-type connector, 5V p-p typical, 110 Ohms. 1 Digital signal ground 2 Digital Audio + 3 Digital Audio - S/PDIF Digital Audio Output, J102 BNC-type connector, 0.5V p-p typical, 75 ohms.

  • Page 28: Status / Control, J104, 25-Pin D-Connector

    Status / Control, J104, 25-pin D-connector: Connection VREF DGND DGND DGND DGND DGND TEST IN DOWNLOAD FAULT TEST OUT MUTE DGND RS-232 Port, J105 Connection Ground Analog Audio Input, J106 & J107 XLR-type connectors Connection 1 Analog signal ground 2 Analog Audio + 3 Analog Audio - Comments Do Not Connect...

  • Page 29: Rs-449 Interface Description

    RS-449 Interface Description 6.2.1 Functional Description The Dolby Model DP524 provide a standard RS-449 interface in the type DT mode (data and timing signals only, no handshakes) through 37-pin male D-connectors. RS-449 is the mechanical specification for a balanced (differential) transmission system meeting RS-422 and RS-423 electrical specifications.

  • Page 30: Back-To-Back Testing

    DP523 directly to the ST inputsof the DP523 and to the RT inputs of the DP524. This cable also connects the SD outputs of the DP523 to the RD inputs of the DP524, and connects the signal grounds (SG) of the two units. The DP523 end of the cable should be labeled “Encoder”...

  • Page 31: Serial Control

    Serial Control It is possible to command the DP524 via the RS-232 port, J105 on the rear of the unit when the Command/Aux data switch (S101-4) is in the Up position. The communications protocol for command mode is fixed at 9600 baud, 1 stop bit, no parity.
  • Page 32 Command $18: Return System Status The unit returns the following byte: Dr_lock Sr_lock Each bit is returned set if the associated signal is active. Dr_lock and Sr_lock are internal signals. Dr_lock is active when the decoder has successfully locked to the incoming RS-449 clock 'RT' : Receive Timing.

  • Page 33: Ac-3 Related Commands

    This command will return $FF if the decoder is in Test Tone mode or if the decoder is in normal mode but does not have an input data clock that it can lock to. Otherwise the returned data is as follows: 6.3.2 AC-3 Related commands The following commands are only applicable to the AC-3 algorithm.
  • Page 34 Command $42: Set Compression mode Where data is as follows: C0 and C1 are defined as follows: Custom mode, no digital dialog normalization Custom mode, digital dialog normalization data Comment Line Out Mode RF mode MAIN...

  • Page 35: Specifications

    Better than 0.01 dB. Audio Coding Method Dolby AC-2 or AC-3 Time Delay Varies with algorithm. Contact Dolby Laboratories. External Timing External clock range: ±100 ppm of total data rate; RS-422 input (balanced voltage digital interface, 50% D.C. per RS-449 specification).
  • Page 36 Digital Audio Outputs AES/EBU, 3-pin XLR-type, male, balanced , 110 ohms ±5%, 5V S/PDIF, BNC female connector, unbalanced, 75 ohms ±5%, 0.5V Data Output / Command Input RS232, Male 9-pin D connector. RS-422, Female 25-pin D connector. These connectors may be used to load software upgrades into the unit, allow serial control of the unit or to output auxiliary data.
  • Page 37 General Power Requirements 90-260 VAC, 50-60 Hz, 24VA Dimensions and Weight 1- ¾ x 19 x 11- ¾ inches (4.45 x 48.26 x 29.8 cm), 8.5 pounds (3.9 kg), approx. Emissions Complies with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. Environmental Requirements Operating : 0 o C to 50 o C, natural convection cooling.
  • Page 38 MAIN...

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