IEC 61937-5:2006

INTERNATIONAL IEC
STANDARD 61937-5
Second edition
2006-01
Digital audio –
Interface for non-linear PCM encoded
audio bistreams applying IEC 60958 –
Part 5:
Non-linear PCM bitstreams according to
the DTS (Digital Theater Systems) format(s)

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INTERNATIONAL IEC
STANDARD 61937-5
Second edition
2006-01
Digital audio –
Interface for non-linear PCM encoded
audio bistreams applying IEC 60958 –
Part 5:
Non-linear PCM bitstreams according to
the DTS (Digital Theater Systems) format(s)

 IEC 2006  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
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– 2 – 61937-5  IEC:2006(E)
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references .5
3 Terms, definitions, abbreviations and presentation convention .5
3.1 Terms and definitions .5
3.2 Abbreviations .5
3.3 Presentation convention .6
4 Mapping of the audio bitstream on to IEC 61937-1 .6
4.1 DTS burst-info.6
5 Format of DTS data-bursts .6
5.1 General .6
5.2 Pause data-burst.6
5.3 Audio data-bursts .7

Annex A (informative) Effect of repetition period of data burst and Fs on frame period
and maximum data rate in DTS type IV .14

Bibliography.15

Table 1 – Fields of burst-info .6
Table 2 – Repetition period of the pause data-bursts .7
Table 3 – Data-type-dependent when DTS type I .7
Table 4 – Data-type-dependent when DTS type II .9
Table 5 – Data-type-dependent when DTS type III .10
Table 6 – Data-type-dependent when DTS type IV.12
Table A.1 – DTS type IV payload and frame repetition: some examples .14

61937-5  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 5: Non-linear PCM bitstreams according to
the DTS (Digital Theater Systems) format(s)

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61937-5 has been prepared by Technical Area 4: Digital system
interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
This second edition cancels and replaces the first edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition.
a) References to the company name Digital Theater Systems have been changed to DTS
which is consistent with the official change of the company name.

– 4 – 61937-5  IEC:2006(E)
b) DTS type IV has been added to Table 1 and 5.3.4 describing type IV has been added.
c) Annex A, which provides examples of the use of the repetition period parameter
introduced in subclause 5.3.4, has been added.
The text of this standard is based on the following documents:
CDV Report on voting
100/974/CDV 100/1055/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61937 consists of the following parts, under the general title Digital audio – Interface for
non-linear PCM encoded audio bitstreams applying IEC 60958:
Part 1: General
Part 2: Burst-info
Part 3: Non-linear PCM bitstreams according to the AC-3 format
Part 4: Non-linear PCM bistreams according to the MPEG audio formats
Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater Systems) format(s)
Part 6: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X
formats
Part 8: Non-linear PCM bitstreams according to the Windows Media Audio Professional
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

—————————
To be published.
61937-5  IEC:2006(E) – 5 –
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 5: Non-linear PCM bitstreams according to
the (Digital Theater Systems) DTS format(s)

1 Scope
This part of IEC 61937 describes audio bitstreams encoded according to the Digital Theater
Systems (DTS) format data-types I, II, III, and IV.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60958-1, Digital audio interface – Part 1: General
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 60958-4, Digital audio interface – Part 4: Professional applications
IEC 61937-1, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 1: General
IEC 61937-2, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 2: Burst Information
3 Terms, definitions, abbreviations and presentation convention
For the purposes of this document, the following terms, definitions, abbreviations and
presentation convention apply.
3.1 Definitions
3.1.1
latency
delay time of an external audio decoder to decode a DTS data-burst, defined as the sum of
two values of the receiving delay time and the decoding delay time
3.2 Abbreviations
IEC International Electrotechnical Commission
ISO/IEC MPEG The Moving Pictures Expert Group, a joint committee of ISO and IEC

– 6 – 61937-5  IEC:2006(E)
3.3 Presentation convention
F872h Value ‘F872’ in hexadecimal format

4 Mapping of the audio bitstream on to IEC 61937-1
The coding of the bitstream and data-burst is in accordance with IEC 61937-1 and 61937-2.
4.1 DTS burst-info
The 16-bit burst-info contains information about the data which will be found in the data-burst.
Table 1 – Fields of burst-info
Bits of Reference Repetition period of data-burst
Value Contents
Pc point R in IEC 60958 frames
0-4 Data-type
0-10 According to IEC 61937
11 DTS type I Bit 0 of Pa 512
12 DTS type II Bit 0 of Pa 1 024
13 DTS type III Bit 0 of Pa 2 048
14-16 According to IEC 61937
17 DTS type IV Dependent on bits 8-10
14-31 According to IEC 61937 Bit 0 of Pa
5, 6 Reserved
7 According to IEC 61937
Reserved for DTS types I, II and III
8-10
For the repetition period for DTS type
IV, see Table 6
11, 12 Reserved
13-15 According to IEC 61937
5 Format of DTS data-bursts
This clause specifies the audio data-bursts DTS type I, DTS type II, DTS type III and DTS
type IV. Specific properties such as reference points, repetition period, the method of filling
stream gaps, and decoding latency are specified for each data-type.
5.1 General
The decoding latency (or delay), indicated for the data-types, should be used by the
transmitter to schedule data-bursts as necessary to establish
...