IEC 61937-17:2025
(Main)Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 17: Non-linear PCM bitstreams according to the AVS3-P3 format
Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 17: Non-linear PCM bitstreams according to the AVS3-P3 format
IEC 61937-17:2025 specifies the method to convey non-linear PCM bitstreams encoded according to the AVS3-P3 format.
General Information
Standards Content (Sample)
IEC 61937-17 ®
Edition 1.0 2025-07
INTERNATIONAL
STANDARD
Digital audio - Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 -
Part 17: Non-linear PCM bitstreams according to the AVS3-P3 format
ICS 33.160.30; 33.160.60; 35.040.40 ISBN 978-2-8327-0512-4
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CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Mapping of the audio bitstream on to IEC 61937-1 . 4
4.1 General . 4
4.2 AVS3-P3 burst-info . 4
5 Format of AVS3-P3 data-bursts . 6
5.1 General . 6
5.2 Pause data-burst . 6
5.3 Audio data-bursts . 6
5.3.1 AVS3-P3 data . 6
5.3.2 Latency of AVS3-P3 decoding . 8
Bibliography . 10
Figure 1 – AVS3-P3 data-burst . 6
Figure 2 – Latency of AVS3-P3 decoding . 8
Table 1 – Fields of burst-info . 5
Table 2 – Repetition period of the pause data-bursts . 6
Table 3 – Frame repetition period and maximum data rate for AVS3-P3 bitstream . 7
Table 4 – Latency of AVS3-P3 decoding . 9
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Digital audio - Interface for non-linear PCM encoded
audio bitstreams applying IEC 60958 -
Part 17: Non-linear PCM bitstreams according to the AVS3-P3 format
FOREWORD
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IEC 61937-17 has been prepared by technical area 20: Analogue and digital audio, of IEC
technical committee 100: Audio, video and multimedia systems and equipment. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/4187/CDV 100/4264/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all the parts in the IEC 61937 series, published under the general title Digital audio –
Interface for non-linear PCM encoded audio bitstreams applying IEC 60958, can be found on
the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
1 Scope
This part of IEC 61937 specifies the method to convey non-linear PCM bitstreams encoded
according to the AVS3-P3 format.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 61937-1:2021, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61937-1 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
AVS3-P3 frame
bitstream generated by an AVS3-P3 encoder per block of PCM audio samples based on
T/AI 109.3, treated as a basic audio block for further use such as decoding, transmission, or
storage
3.2
AVS3-P3 frame length
number of PCM audio samples per audio frame
3.3
decoding latency
delay time of an external audio decoder to decode an AVS3-P3 data burst, defined as the sum
of two values of the receiving delay time and the decoding delay time
4 Mapping of the audio bitstream on to IEC 61937-1
4.1 General
The coding of the bitstream and data-burst is in accordance with IEC 61937-1:2021 and
AVS3-P3.
4.2 AVS3-P3 burst-info
Pc bits 0 to 7 shall indicate extended data-type according to IEC 61937-1:2021, 6.1.8.3. As all
bits are used in the preamble word of Pc, the value of data-type bits 0 to 7 in Pc is set to be
1 Fh. The extended data-type burst preamble Pe is used and the value is set to be 0x0002 h.
The 16-bit burst-info of Pe is used to convey the information on AVS3-P3 audio frames and the
repetition period as described in Table 1.
Table 1 – Fields of burst-info
Extended Sub- Data-type-
Data-
Data- data- dependent-
type
type type info
Reference Repetition period of data-burst
Contents
point R measured in IEC 60958 frames
Value of Value of V a lue of
Value of Pc
Pe bits Pc bits Pc bits
bits 10 to 11
0 to 15 0 to7 8 to 9
1 024, i.e., IEC 60958 frame rate is
0 Bit 0 of Pa
1x of the audio sample rate.
AVS3-P3 4 096, i.e., IEC 60958 frame rate is
1 Bit 0 of Pa
4x of the audio sample rate.
(with a frame
length of 8 192, i.e., IEC 60958 frame rate is
2 Bit 0 of Pa
1024) 8x of the audio sample rate,
16 384, i.e., IEC 60958 frame rate is
3 Bit 0 of Pa
16x of the audio sample rate.
0x0002 0x1 F 512, i.e., IEC 60958 frame rate is 1x
0 Bit 0 of Pa
of the audio sample rate.
2 048, i.e., IEC 60958 frame rate is
1 Bit 0 of Pa
AVS3-P3
4x of the audio sample rate.
(with a frame
4 096, i.e., IEC 60958 frame rate is
2 length of 512) Bit 0 of Pa
8x of the audio sample rate.
8 192, i.e., IEC 60958 frame rate is
3 Bit 0 of Pa
16x of the audio sample rate.
2 to 3 Reserved for future use
Bits 0 to 6 of the burst-info (Pc) and bits 0 to 15 of the burst-info (Pe) signal the data-type used
for transmission. For AVS3-P3, the signalled extended data-type is 0x0002 h.
In this document, the sub-data-type 0 is used for AVS3-P3 with a frame length of 1 024, and
the sub-data-type 1 is used for AVS3-P3 with a frame length of 512. In order to provide more
flexibility for different versions of transmission media of different bandwidths, four different
repetition periods can be selected for each AVS3-P3 frame length via the data-type-dependent-
info of bits 10 to 11 in Pc. For the frame length of 1 024 (sub-data-type is 0), they are 1 024
(the repetition period of the data-burst measured in IEC 60958 frames), 4 096, 8 192, and
16 384 corresponding to the data-type-dependent-info values of 0, 1, 2, and 3, respectively,
using the bits 10 to 11 in Pc of the 5-bit data-type-dependent-inf
...
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