IEC 61937-5:2002

INTERNATIONAL IEC
STANDARD
61937-5
First edition
2002-08
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)

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INTERNATIONAL IEC
STANDARD
61937-5
First edition
2002-08
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)

 IEC 2002  Copyright - all rights reserved
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– 2 – 61937-5  IEC:2002(E)
CONTENTS
FOREWORD . 3

1 Scope . 4

2 Normative references. 4

3 Definitions and abbreviations. 4

4 Mapping of the audio bitstream on to IEC 61937-1. 5

4.1 DTS burst-info . 5
5 Format of DTS data-bursts . 5
5.1 General . 5
5.2 Pause data-burst . 5
5.3 Audio data-bursts. 5
5.3.1 DTS type I. 5
5.3.2 DTS type II. 7
5.3.3 DTS type III. 8
Bibliography .10
Figure 1  DTS type I data-burst. 6
Figure 2  Latency of DTS type I decoding. 7
Figure 3  DTS type II data-burst. 7
Figure 4  Latency of DTS type II decoding. 8
Figure 5  DTS type III data-burst. 8
Figure 6  Latency of DTS type III decoding. 9
Table 1  Fields of burst-info . 5
Table 2  Repetition period of Pause data-bursts. 5
Table 3  Data-type-dependent when DTS type I . 6
Table 4  Data-type-dependent when DTS type II . 7
Table 5  Data-type-dependent when DTS type III . 9

61937-5  IEC:2002(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 IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
This part of International Standard IEC 61937 has been prepared by technical area 4, Digital
system interfaces, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/499/FDIS 100/538/RVD
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.
The committee has decided that this publication remains valid until 2005. At this date, in
accordance with the committee’s decision, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 61937-5  IEC:2002(E)
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)

1 Scope
This part of IEC 61937 describes audio bitstreams encoded according to the Digital Theater
Systems (DTS) format data-types I, II and III.
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 60958-1:1999, Digital audio interface – Part 1: General
IEC 60958-3:1999, Digital audio interface – Part 3: Consumer applications

IEC 60958-4:1999, 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 apply-
ing IEC 60958 – Part 2: Burst information
3 Definitions and abbreviations
For the purposes of this standard, the following definitions, abbreviations and presentation
convention apply.
3.1 Definition
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
DTS Digital Theater Systems
ISO/IEC MPEG The Moving Pictures Expert Group, a joint committee of ISO and IEC
3.3 Presentation convention
F872h
Value ‘F872’ in hexadecimal format
___________
To be published.
61937-5  IEC:2002(E) – 5 –
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.

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

Repetition period of
Reference
Bits of Pc Value Contents data-burst in
point R
IEC 60958 frames
0 – 4 Data-type
0 – 10 In accordance with IEC 61937-2
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 – 31 In accordance with IEC 61937-2
5 – 15 In accordance with IEC 61937-2
5 Format of DTS data-bursts
This clause specifies the audio data-bursts DTS type I, DTS type II and DTS type III. 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 synchronization between picture and
decoded audio.
5.2 Pause data-burst
Pause data-burst for DTS type I, DTS type II, DTS type III is given in Table 2.

Table 2 – Repetition period of Pause data-bursts
Repetition period of Pause data-burst
Data-type of Audio data-burst
Mandatory Recommended
DTS type I 3 IEC 60958 frames
-
DTS type II - 3 IEC 60958 frames
DTS type III 3 IEC 60958 frames
-
5.3 Audio data-bursts
5.3.1 DTS type I
The DTS consists of sequences of DTS frames. The data-type of a DTS data-burst type I is
0Bh. The data-burst is headed with a burst-preamble, followed by the burst-payload, and

– 6 – 61937-5  IEC:2002(E)
stuffed with stuffing bits. The burst-payload of each data-burst of DTS type I data shall contain

one complete DTS-frame, and represents 512 samples for each encoded channel.

NOTE 1 The length of the DTS type I data-burst depends on the encoded bit rate (which determines the DTS-
frame length).
NOTE 2 The reference
...