Dolby Laboratories DP564 Appendix B Latency Values

DP564 Multichannel Audio Decoder

B-1

Appendix B Latency Values

The latency of the DP564 is defined as the difference in time between the beginning

of a valid Dolby® Digital frame entering the DP564 and the output of the first PCM

sample represented by that frame.

Note: At any sample rate, a Dolby Digital frame represents 1,536 audio samples.

The DP564 accepts data over both professional and consumer industry standardized

interfaces. The professional interface is specified by SMPTE2. The consumer

interface is specified by IEC 619373. Each interface specification includes a

specification for the latency of the decoder with respect to a reference point in the

data stream. The DP564 may add a small additional delay over that specified in the

SMPTE or IEC standards, if extra processing is performed.

B.1 SMPTE Specification (Professional AES3)

The SMPTE specification describes placement of the Dolby Digital frame on the

AES3 interface such that a decoder with the specified latency produces audio that is

timed correctly. The specified decoder latency is exactly one Dolby Digital frame

period, with respect to the reference point. The reference point is the first bit of the

Dolby Digital frame occurring on the interface. The SMPTE specification allows

equipment that outputs Dolby Digital streams on the AES3 interface to know when,

with respect to timecode or associated video, to output each Dolby Digital frame of

data in order to allow a standard decoder to reproduce audio at the proper presentation

time. The specification also allows equipment that receives the Dolby Digital data to

know when the audio in each frame should be reproduced.

Another way to maintain synchronization is by using time stamps. The SMPTE

specification provides for a time stamp to be associated with an audio frame of data.

The time stamp can indicate the timecode value that applies to an identified sample

within a Dolby Digital frame. The time stamp can also indicate an absolute time

offset of the stream, so that a Dolby Digital encoder, for example, can identify its own

latency to another piece of equipment, for example an MPEG multiplexer.

2 SMPTE 340M Format for Non-PCM Audio and Data in AES3 - ATSC A/52 (AC-3) Data Type

3 IEC 61937 Interface for non-linear PCM encoded audio bistreams applying IEC 60958

Contents

Main Dolby Laboratories, Inc. Table of Contents Page Page List of Figures List of Tables Regulatory Notices and Fusing Information FCC Canada UL EU D I S NL Fusing Information Page Chapter 1 Introduction DP564 Multichannel Audio Decoder Introduction 1-2 Page Page Chapter 2 Installation 2.1 Mounting 2.2 Rear-Panel Connections 2.2.1 BNC Connectors 2.2.2 Optical In and Serial Ports 2.2.3 Analog Outputs 2.2.4 Power Page DP564 Multichannel Audio Decoder 3-1 Chapter 3 Front-Panel Controls s t o m 3.2 Button Functions 3.2.1 Navigation 3.2.2 Listening Modes Page 3.2.3 Input 3.2.4 Preset 3.2.5 Output Level 3.2.6 Special Button Functions 3.3 LED Indicators Page Page Chapter 4 Menus 4.1 Menu Basics 4.2 Hot-Key Functions 4.3 Status Menu 4.3.1 Main Status Menu -27 PCM Audio 44.1 kHz 20 Bit Consumer Preset 1 4.3.2 Output Level Meters 4.3.3 Compression Meters 4.3.4 Monitor Status 4.3.5 Metadata Status 4.3.6 Input Status 4.3.7 AES Reference Input Status 4.3.8 Timecode Status 4.3.9 Error Statistics 4.3.10 System Status 4.4 Setup Menu 4.4.1 Operating Mode 4.4.2 Monitor Control Page Page Page 4.4.3 User Presets ABCDEFGHIJKLM/ NOPQRSTUVWXYZ_ 123456789.:~ Save Preset 1 Preset 1 OK Del Space Clear ! 4.4.4 I/O Control Page 4.4.5 Monitor Configuration 4.4.6 System Settings ABCDEFGHIJKLM/ NOPQRSTUVWXYZ_ 123456789.:-~ Unit Name Model DP564 OK Del Space Clear ! Page Page Page Chapter 5 Listening Room Calibration 5.1 Speaker Configuration Settings 5.2 Speaker Delay Values 5.2.1 Center Delay 5.2.2 Surround Delay 5.2.3 Back Surround Delay 5.2.4 Pro Logic Delay 5.3 Calibration Page Page Page 5.4 One-Touch Output Level Adjustment Page Chapter 6 Operating Modes 6.1 Monitoring Modes 6.1.1 Downmix 6.1.2 Decoding 6.1.3 Listening 6.1.4 Compression 6.2 Hardware Remote Control 6.2.1 Cat. No. 549 Configuration Button Pro Logic II LED Sense Normal Cat.No.549 Config 4 6.2.2 GPI/O Pin Configuration Pin 23 In Out Page Page Page Chapter 7 Using New Features 7.1 Multiple Inputs 7.2 Expanded Preset Storage Page 7.9 Timecode Output 7.10 External AES Reference 7.11 Ethernet Software Remote Control 7.12 Streaming 7.13 Karaoke Page Chapter 8 Streaming Server and Remote Software 8.1 DolbyRemote 564 8.2 Hardware Connection 8.3 Installing DolbyRemote 564 8.4 Launching the Application 8.5 DolbyRemote 564 Overview 8.6 Streaming 8.6.1 Server Location 8.6.2 File Selection 8.6.3 Play, Pause, Stop Control 8.6.4 Slide Bar Control 8.7 Dolby Streaming Server 8.7.1 Installing the Dolby Streaming Server 8.7.2 Launching the Application Appendix A Metadata A.1 Metadata Overview Page Page A.2 Dialogue Level Page A.3 Dynamic Range Control Page Dynamic Range Control Profiles Input Level Ouput Level A.4 Downmixing Page A.5 Parameter Definitions A.5.1 Universal Parameters Page Page Page Page Page Page A.5.2 Extended Bitstream Information Parameters Page Page Page A.6 Metadata Combinations Page Appendix B Latency Values B.1 SMPTE Specification (Professional AES3) B.2 IEC 61937 Specification (Consumer S/PDIF) Page Page Appendix C Specifications