ISO/IEC 14496-3:2009/Amd 7:2018

INTERNATIONAL ISO/IEC
STANDARD 14496-3
Fourth edition
2009-09-01
AMENDMENT 7
2018-09
Information technology — Coding of
audio-visual objects —
Part 3:
Audio
AMENDMENT 7: SBR enhancements
Technologies de l'information — Codage des objets audiovisuels —
Partie 3: Codage audio
AMENDEMENT 7
Reference number
ISO/IEC 14496-3:2009/Amd.7:2018(E)
©
ISO/IEC 2018

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ISO/IEC 14496-3:2009/Amd.7:2018(E)

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ISO/IEC 14496-3:2009/Amd.7:2018(E)

Foreword
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work. In the field of information technology, ISO and IEC have established a joint technical committee,
ISO/IEC JTC 1.
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.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 14496 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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© ISO/IEC 2018 – All rights reserved iii

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ISO/IEC 14496-3:2009/Amd.7:2018(E)
Information technology — Coding of audio-visual
objects —
Part 3:
Audio
AMENDMENT 7: SBR enhancements

1.5.1.2.6
Replace the first sentence with:
The SBR Object contains the SBR-Tool and the MPEG-4 SBR Enhancements as signalled in the SBR
extension element (bs_extension_id== EXTENSION_ID_ESBR) of Annex 8.A and can be combined
with the audio object types indicated in Table 1.2. If a decoder detects and supports this SBR
extension element, the decoder shall process the MPEG-4 SBR Enhancements.

1.5.2.2
In Table 1.4, update the row for Object Type SBR as follows:
SBR fs = 24/48 kHz (in/out) 3 2.5 1)
(SBR tool)
fs = 24/48 kHz (in/out) 4.5 3 1)
(eSBR tool)
fs = 24/48 kHz (in/out) 2 1.5 1)
(Low Power SBR tool)
fs = 48/48 kHz (in/out) 4.5 2.5 1)
(Down Sampled SBR tool)
fs = 48/48 kHz (in/out) 3 1.5 1)
(Low Power Down
Sampled SBR tool)
© ISO/IEC 2018 – All rights reserved 1

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ISO/IEC 14496-3:2009/Amd.7:2018(E)

1.5.2.3
Replace Table 1.11 with the following:
Level Max. Max. AAC Max. AAC Max. SBR Max. PCU Max. RCU Max. Max.
chan- sampling sampling sampling PCU Low RCU Low
nels/ rate, SBR rate, SBR rate [kHz] power SBR power SBR
object not present present (in/out)
[kHz] [kHz]
1 NA NA NA NA NA NA NA NA
2 2 48 24 24/48 11 11 7 8
a
3 2 48 48 48/48 17 11 12 8
b a
4 5 48 24/48 48/48 30 31 20 23
5 5 96 48 48/96 60 33 39 23
b a
6 7 48 24/48 48/48 42 41 27 30
7 7 96 48 48/96 82 44 53 30
a
For level 3, level 4 and level 6 decoders, it is mandatory to operate the SBR tool in downsampled mode if the sampling
rate of the AAC core is higher than 24 kHz. Hence, if the SBR tool operates on a 48 kHz AAC signal, the internal sampling rate
of the SBR tool will be 96 kHz, however, the output signal will be downsampled by the SBR tool to 48 kHz.
b
For one or two channels the maximum AAC sampling rate, with SBR present, is 48 kHz. For more than two channels the
maximum AAC sampling rate, with SBR present, is 24 kHz.
Replace Table 1.12 with the following:
a
Level Max. Max. AAC Max. AAC Max. SBR Max. PCU Max. RCU Max. PCU Max. RCU
chan- sampling sampling sampling HQ / LP HQ / LP
e e
nels/ rate, SBR rate, SBR rate [kHz] SBR SBR
object not present present (in/out)
[kHz] [kHz]
1 NA NA NA NA NA NA NA NA
2 2 48 24 24/48 11 11 9 10
c b
3 2 48 24/48 48/48 17 11 15 10
d b
4 5 48 24/48 48/48 30 31 20 23
5 5 96 48 48/96 60 33 39 23
d b
6 7 48 24/48 48/48 42 41 27 30
7 7 96 48 48/96 82 44 53 30
a
Level 2, 3, 4, 6 and 7 HE AAC v2 Profile decoders implement the baseline version of the parametric stereo tool. A level 5
decoder shall not be limited to the baseline version of the parametric stereo tool.
b
For level 3, level 4 and level 6 decoders, it is mandatory to operate the SBR tool in downsampled mode if the sampling
rate of the AAC core is higher than 24 kHz. Hence, if the SBR tool operates on a 48 kHz AAC signal, the internal sampling rate
of the SBR tool will be 96 kHz, however, the output signal will be downsampled by the SBR tool to 48 kHz.
c
If Parametric Stereo data is present the maximum AAC sampling rate is 24 kHz, if Parametric Stereo data is not present
the maximum AAC sampling rate is 48 kHz.
d
For one or two channels the maximum AAC sampling rate, with SBR present, is 48 kHz. For more than two channels the
maximum AAC sampling rate, with SBR present, is 24 kHz.
e
The PCU/RCU number are given for a decoder operating the LP SBR tool whenever applicable.
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ISO/IEC 14496-3:2009/Amd.7:2018(E)

1.6.7.2
Replace Table 1.27 with the following:
Value Additional Decoder operation mode
a
of n delay
1 0 A) All operation modes not listed elsewhere in this table.
963 962 B1) HE-AAC or HE-AAC v2 decoder with SBR operated in dual-
rate mode; decoding HE-AAC or HE-AAC v2 compressed audio.
482 481 B2) Same as B1), but with SBR operated in downsampled mode.
3011 3010 B3) Same as B1), but with SBR Enhancements enabled.
a
The delay introduced by the post-processing is given in number of samples (per audio channel)
at the output sample rate for the given decoder operation mode.

4.5.2.8.1
Replace Table 4.112 with the following:
bs_extension_id Meaning
0 reserved
1 reserved
a
2 EXTENSION_ID_PS
a
3 EXTENSION_ID_ESBR
a
See subclause 8.A.

After Table 4.119 add the following:
esbr_fill_bits             Fill bits to enable correct parsing of the sbr_extension() element.

Annex 8.A
Replace the Annex title with:
Combination of the SBR tool with the parametric stereo tool and SBR Enhancements

8.A.1, paragraph 2
At the end of paragraph 2 add a new paragraph:
In addition, the harmonic transposers and SBR pre-processing as defined in ISO/IEC 23003-3 may
be used in combination with the SBR tool as defined in 4.6.18. The bitstream element esbr_data() as
defined in 8.A.2 conveys the information needed by these tools
...