Dolby Laboratories DP524 User Manual

Model DP524

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Two-Channel AC-2 / AC-3
Digital Audio Decoder

Users' Manual

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Users' Manual

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For

Model DP524

AC-2 / AC-3 Two-Channel

Digital Audio Decoder

Dolby Laboratories Incorporated

U.S.A. 100 Potrero Avenue, San Francisco, CA 94103

Tel: [phone]; Fax: [phone]

U.K. Wootton Bassett, Wiltshire SN4 8QJ

Tel: [phone]; Fax: [phone]

Equipment manufactured by Dolby Laboratories is warranted against defects in materials and

DISCLAIMER OF WARRANTIES:

workmanship for a period of one year from the date of purchase. All warranties, conditions or other terms implied by statute are excluded to
the fullest extent allowed by law.

LIMITATION OF LIABILITY:

negligence or otherwise shall not exceed the cost of repair or replacement of the defective components and under no circumstances shall
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.

This unit complies with the EMC requirements of prEN55103-1 and -2 when installed in accordance with this manual in an E2 environment

It is understood and agreed that Dolby Laboratories’ liability whether in contract, in tort, under any warranty, in

Dolby and the double-D symbol are registered trademarks of Dolby Laboratories Licensing Corporation.

©1998 Dolby Laboratories Inc.

ISSUE 3

S98/10536/11869

Dolby Part No. 91394

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SECTION 1 Introduction

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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 ......................................................3-1

3.3 Fusing Information........................................................................................3-1

Main Fuse................................................................................................3-1

Internal Fuse............................................................................................3-2

3.4 Configuring Jumper Settings.........................................................................3-2

3.4.1 Jumpers for Encoded Data In & Timing (J103)............................3-4

Receive Timing / Receive Data Termination..............................3-4

Request to Send / Terminal Ready Enable..................................3-4

3.4.2 Signal Ground-to-Chassis Link...................................................3-4

3.5 Configuring the Rear Panel DIP Switch S101...............................................3-4

3.5.1 Switch nos. 1, 7 & 8 - Test Tone.................................................3-5

3.5.2 Switch nos. 2, 5 & 6 Software Download..................................3-5

3.5.3 Switch no. 3 - Digital Output Format Selection..........................3-6

3.5.4 Switch nos. 4, 5 & 6 - Command/Aux Data................................3-6

TABLE OF CONTENTS

SECTION 4 Installation

4.1 Mounting.......................................................................................................4-1

4.2 Audio Connections........................................................................................4-1

4.2.1 S/PDIF Output - J102..................................................................4-1

4.2.2 AES/EBU Output - J101 .............................................................4-1

4.2.3 Analog Outputs - J106/7..............................................................4-1

4.3 Data, Status, and Remote Control Connections ............................................4-2

4.3.1 Encoded Data In & Timing - J103...............................................4-2

4.3.2 RS-232 (J105)..............................................................................4-2

4.3.3 RS-422 (J106)..............................................................................4-3

4.3.4 Parallel Status and Control (J104)...............................................4-3

SECTION 5 Operation

5.1 Front Panel Status Indicators.........................................................................5-1

5.2 Rear Panel Level Controls.............................................................................5-2

5.3 Test Tone Level.............................................................................................5-2

5.4 Software Downloading Procedure.................................................................5-2

SECTION 6 Interface Specification and Description

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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 ................................................................................... 6-2

Analog Audio Input, J106 & J107 .......................................................... 6-2

6.2 RS-449 Interface Description........................................................................ 6-3

6.2.1 Functional Description................................................................... 6-3

6.2.2 Interface Timing............................................................................. 6-3

6.2.3 Back-to-Back Testing..................................................................... 6-4

6.3 Serial Control ................................................................................................6-5

6.3.1 System related commands........................................................... 6-5

6.3.2 AC-3 Related commands ............................................................ 6-7

SECTION 7 Product Specifications

1.1 Introduction

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The Dolby Model DP524 is a digital audio decoder unit supporting both Dolby AC­2 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.

The unit automatically configures itself for the appropriate data rate, sample rate
and algorithm type.

Both digital (AES/EBU and S/PDIF) and analog outputs are provided.

A full duplex serial control system has also been implemented which allows the user
to retrieve Status or Aux. data from the decoder. It is also possible for the user to
update the units software revision by means of a serial download capability.

SECTION 1

INTRODUCTION

The decoder provides front panel system status indicators as well as the ability to
respond to serial inquiries relating to system status.

A digitally generated test signal is provided for system alignment and
troubleshooting and can be activated from a rear panel switch or via the serial
control system.

Rear panel analog output level trimmers are provided.

This manual includes installation procedures, descriptions of Model DP524
operation, and interface specifications.

1.2 Features

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• 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

• Selectable auxiliary data rates (0 - 9600 baud).

• RS-232 and RS-422 serial interfaces allows Control, Status, Software

Download and Auxiliary data.

• Built-in test tone generator

1.3 Dolby AC-3 and AC-2

1-2

Despite the low, spectrum-efficient data rate, Dolby AC-3 and AC-2 yield very high
audio quality and is suitable for the most demanding of professional and consumer
distribution applications. First demonstrated to the film industry in May of 1991,
Dolby AC-3 audio coding technology has evolved into a very sophisticated and
flexible system for the digital representation of high quality sound. Dual channel
implementations of the AC-3 algorithm can be user-configured to operate in Dual
Mono or Stereo modes.

AC-3 and AC-2 are compatible with Dolby Matrix Surround decoding. A wide
range of bit rates and audio coding modes are supported with this audio coding
technique, and are summarized in the tables on the following page.

1-3

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1.4 Data Rates, Sample Rates and Channels

Possible AC-3 Data Rates, Sample Rates and Number of Channels

Data Rate Sample rate Channels

40 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
48 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
56 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
64 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
80 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder

96 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
112 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
128 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
160 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
192 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
224 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
256 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
320 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder
384 kbps 32kHz, 44.1kHz or 48kHz Set by Encoder

Possible AC-2 Data Rates, Sample Rates and Number of Channels

Data Rate Sample rate Channels

128 kbps 48kHz 1
192 kbps 48kHz 1
256 kbps 48kHz 2
384 kbps 48kHz 2

1.5 Regulatory Notices

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FCC

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. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with this
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his
or her own expense.

1-4

UL

Troubleshooting must be performed by trained technicians. Do not attempt to
service this equipment unless you are qualified to do so.

WARNING: Check that the correct fuses have been installed. To reduce the risk of
fire, replace the fuses only with the same type and rating.

Exposed portions of the power supply are electrically "hot". In order to reduce the
risk of electrical shock, the power cord MUST be disconnected when the cover of
this equipment is removed.

UK

Connections for the United Kingdom:

WARNING: THIS APPARATUS MUST BE EARTHED

As the colours of the cores in the mains lead may not correspond with the coloured
markings identifying the terminals in your plug, proceed as follows:

• The core which is coloured green and yellow must be connected to the

terminal in the plug which is marked with the letter E or by the eart h symbol

or coloured green or green and yellow.

• The core which is coloured blue must be connected to the term inal which is

marked with the letter N or coloured black.

• The core which is coloured brown must be connected to the ter minal which is

marked with the letter L or coloured red.

1-5

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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:
o Ensure the voltage selector is set to the correct mains voltage for your supply.
o Ensure fuses fitted are the correct rating and type as marked on the unit.
o The unit must be earthed by connecting to a correctly wired and earthed power outlet.
o The power cord supplied with this unit must be wired as follows:

Live—Brown Neutral—Blue Earth—Green/Yellow

IMPORTANT – NOTE DE SECURITE

Ce materiel est conforme à la norme IEC65. Pour vous assurer d'un fonctionnement sans danger et de prévenir
tout choc électrique ou tout risque d'incendie, veillez à observer les recommandations suivantes.
o Le selecteur de tension doit être placé sur la valeur correspondante à votre alimentation réseau.
o Les fusibles doivent correspondre à la valeur indiquée sur le materiel.
o Le materiel doit être correctement relié à la terre.
o Le cordon secteur livré avec le materiel doit être cablé de la manière suivante:

Phase—Brun Neutre—Bleu Terre—Vert/Jaune

WICHTIGER SICHERHEITSHINWEIS

Dieses Gerät entspricht der Sicherheitsnorm IEC65. Für das sichere Funktionieren des Gerätes und zur
Unfallverhütung (elektrischer Schlag, Feuer) sind die folgenden Regeln unbedingt einzuhalten:
o Der Spannungswähler muß auf Ihre Netzspannung eingestellt sein.
o Die Sicherungen müssen in Type und Stromwert mit den Angaben auf dem Gerät übereinstimmen.
o Die Erdung des Gerätes muß über eine geerdete Steckdose gewährleistet sein.
o Das mitgelieferte Netzkabel muß wie folgt verdrahtet werden:

Phase—braun Nulleiter—blau Erde—grün/gelb

NORME DI SICUREZZA – IMPORTANTE

Questa apparecchiatura è stata costruita in accordo alle norme di sicurezza IEC 65. Per una perfetta
sicurezza ed al fine di evitare eventuali rischi di scossa êlettrica o d'incendio vanno osservate le
seguenti misure di sicurezza:
o Assicurarsi che il selettore di cambio tensione sia posizionato sul valore corretto.
o Assicurarsi che la portata ed il tipo di fusibili siano quelli prescritti dalla casa costruttrice.
o L'apparecchiatura deve avere un collegamento di messa a terra ben eseguito; anche la connessione rete deve

avere un collegamento a terra.

o Il cavo di alimentazione a corredo dell'apparecchiatura deve essere collegato come segue:

Filo tensione—Marrone Neutro—Blu Massa—Verde/Giallo

AVISO IMPORTANTE DE SEGURIDAD

Esta unidad cumple con la norma de seguridad IEC65. Para asegurarse un funcionamiento
seguro y prevenir cualquier posible peligro de descarga o riesgo de incendio, se han de observar
las siguientes precauciones:
o Asegúrese que el selector de tensión esté ajustado a la tensión correcta para su alimentación.
o Asegúrese que los fusibles colocados son del tipo y valor correctos, tal como se marca en la unidad.
o La unidad debe ser puesta a tierra, conectándola a un conector de red correctamente cableado y puesto a tierra.
o El cable de red suministrado con esta unidad, debe ser cableado como sigue:

Vivo—Marrón Neutro—Azul Tierra—Verde/Amarillo

VIKTIGA SÄKERHETSÅTGÄRDER!

Denna enhet uppfyller säkerhetsstandard IEC65. För att garantera säkerheten och gardera mot
eventuell elchock eller brandrisk, måste följande observeras:

o Konrollera att säkringarna är av rätt typ och för rätt strömstyrka så som anvisningarna på enheten föreskriver.
o Enheten måste vara jordad genom anslutning till ett korrekt kopplat och jordat el-uttag.
o El-sladden som medföljer denna enhet måste kopplas enligt foljande:

Fas—Brun Neutral—Blå Jord—Grön/Gul

BELANGRIJK VEILIGHEIDS-VOORSCHRIFT:

Deze unit voldoet aan de IEC65 veiligheids-standaards. Voor een veilig gebruik en om het gevaar van electrische
schokken en het risico van brand te vermijden, dienen de volgende regels in acht te worden genomen:
o Controleer of de spanningscaroussel op het juiste Voltage staat.
o Gebruik alleen zekeringen van de aangegeven typen en waarden.
o Aansluiting van de unit alleen aan een geaarde wandcontactdoos.
o De netkabel die met de unit wordt geleverd, moet als volgt worden aangesloten:

Fase—Bruin Nul—Blauw Aarde—Groen/Geel

GB

F

D

I

E

So Kontrollera att spänningsväljaren är inställd på korrekt nätspänning.

NL

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