IEC 61937-5:2006/AMD1:2019
(Amendment)Amendment 1 - 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)
Amendment 1 - 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)
General Information
- Status
- Published
- Publication Date
- 23-Jan-2019
- Technical Committee
- TC 100 - Audio, video and multimedia systems and equipment
- Drafting Committee
- MT 61937-5 - TC 100/TA 4/MT 61937-5
- Current Stage
- PPUB - Publication issued
- Start Date
- 10-Jan-2019
- Completion Date
- 24-Jan-2019
Relations
- Effective Date
- 05-Sep-2023
Overview
IEC 61937-5:2006/AMD1:2019 is an important amendment to the IEC 61937-5 standard, issued by the International Electrotechnical Commission (IEC). It specifies the interface for non-linear PCM (Pulse Code Modulation) encoded audio bitstreams that comply with IEC 60958, focusing specifically on bitstream formats utilized by Digital Theater Systems (DTS). This amendment updates and refines the handling of DTS Type IV bitstreams, introducing new profiles and enhancing data burst control mechanisms for improved audio data transmission over digital audio interfaces.
Key Topics
- Non-linear PCM Bitstreams: The amendment deals with non-linear PCM audio data encoded according to DTS formats, enabling efficient digital transmission of compressed multi-channel audio signals.
- DTS Type IV Format: The update specifies parameters for DTS Type IV bitstreams, including:
- Burst repetition periods tied to IEC 60958 frame rates.
- Defined profiles (single burst mode and multi-burst mode) for flexible data transmission.
- Precise control of data bursts using multi-burst control bytes.
- Burst-Info Fields: New and modified Table 1 outlines fields representing repetition periods, data types, and profile indicators within data bursts for DTS encoded streams.
- Profiles of DTS Type IV:
- Profile 0 (Single Burst Mode): Delivers a DTS audio frame per burst with fixed, periodic transmission.
- Profile 1 (Multi-Burst Mode): Supports sequences of 1, 2, 4, or 8 bursts per audio frame, with detailed multi-burst control including burst indexing and delay factors to manage decoder latency.
- Decoder Latency: Clarifications on latency expectations in both single and multi-burst modes help system designers optimize synchronization and playback quality.
- Pause Data-Bursts: Recommendations on inserting pause data-bursts to effectively fill stream gaps, maintaining continuous playback without artifacts.
Applications
This IEC standard amendment is crucial for:
- Audio Equipment Manufacturers: Ensuring that devices such as digital audio players, receivers, and professional multimedia equipment correctly implement DTS non-linear PCM data streams over standardized IEC 60958 interfaces.
- Broadcast and Streaming Systems: Facilitating reliable transmission of DTS encoded multi-channel audio in environments where digital audio interfaces are used.
- Home Theater Systems: Enabling seamless integration and playback of DTS bitstreams over conventional digital audio connections, improving user experience with high-fidelity surround sound.
- Audio Codec Developers: Implementing precise timing, burst control, and error handling as specified, to ensure compatibility across devices.
- Digital Signal Processing: Leveraging the detailed burst and profile structures to optimize DTS audio stream decoding and latency management.
Related Standards
- IEC 60958: The fundamental digital audio interface standard that IEC 61937-5 builds upon for carrying non-linear PCM encoded bitstreams.
- IEC 61937 (Base Standard): Defines general principles for transmitting compressed audio data over IEC 60958 interfaces, including multiple bitstream formats beyond DTS.
- DTS Audio Format Specifications: Proprietary specifications by Digital Theater Systems, defining audio compression algorithms and frame structures referenced in this amendment.
- IEC TC 100: The technical committee responsible for audio, video, and multimedia system standardization, including development and maintenance of IEC 61937 and related standards.
By adopting the guidelines of IEC 61937-5:2006/AMD1:2019, organizations can ensure robust, interoperable handling of DTS non-linear PCM audio bitstreams within digital audio systems, enhancing performance and compatibility across a wide range of professional and consumer audio technologies.
Frequently Asked Questions
IEC 61937-5:2006/AMD1:2019 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 1 - 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)". This standard covers: Amendment 1 - 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)
Amendment 1 - 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 61937-5:2006/AMD1:2019 is classified under the following ICS (International Classification for Standards) categories: 33.160.60 - Multimedia systems and teleconferencing equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61937-5:2006/AMD1:2019 has the following relationships with other standards: It is inter standard links to IEC 61937-5:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
IEC 61937-5:2006/AMD1:2019 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
IEC 61937-5 ®
Edition 2.0 2019-01
INTERNATIONAL
STANDARD
AMENDMENT 1
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 61937-5:2006-01/AMD1:2019-01(en)
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IEC 61937-5 ®
Edition 2.0 2019-01
INTERNATIONAL
STANDARD
AMENDMENT 1
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)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.60 ISBN 978-2-8322-6377-8
– 2 – IEC 61937-5:2006/AMD1:2019
© IEC 2019
FOREWORD
This amendment has been prepared by technical area 4: Digital system interfaces and
protocols, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this amendment is based on the following documents:
CDV Report on voting
100/3101/CDV 100/3163/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website 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.
_____________
Table 1 – Fields of burst-info
Replace Table 1 with the following new table:
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 Repetition period for DTS Type IV, see
Table 6
11 – 12 0 – 3 Profile
13 – 15 According to IEC 61937
© IEC 2019
5.3.4 DTS type IV
Replace 5.3.4 with the following new subclause:
5.3.4 DTS type IV
The DTS bitstream consists of sequences of DTS frames. The data-type of a DTS data-burst
type IV is 11h. The data-burst is headed with a burst-preamble, followed by the burst-payload,
and stuffed with stuffing bits. The data-type-dependent information for DTS type IV is given in
Table 6.
The burst repetition period is set in bits 8 – 10 of Pc (see Table 6). The IEC 60958 frame rate
has an integer relationship to the base sample rate of the compressed audio being delivered.
Any supported base sample rate may be applied. The nominal base sample rate for DTS
type IV is 48 kHz.
Bits 11 and 12 are used to indicate a profile of DTS type IV.
The units of burst_length shall be in bytes. This means the maximum size of a burst is
65 535 bytes.
The reference point of a DTS type IV data-burst is bit 0 of Pa. The data-burst containing DTS
type IV frames shall occur at a regular rate, with the reference point of each DTS type IV
data-burst beginning one audio frame period after the reference point of the preceding DTS
type IV data-burst.
It is recommended that pause data-bursts be used to
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