ISO/IEC 23003-1:2007/Amd 3:2016
(Amendment)Information technology — MPEG audio technologies — Part 1: MPEG Surround — Amendment 3: MPEG Surround extension for 3D Audio
Information technology — MPEG audio technologies — Part 1: MPEG Surround — Amendment 3: MPEG Surround extension for 3D Audio
Technologies de l'information — Technologies audio MPEG — Partie 1: Ambiance MPEG — Amendement 3: Extension de l'ambiance MPEG pour audio 3D
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INTERNATIONAL ISO/IEC
STANDARD 23003-1
First edition
2007-02-15
AMENDMENT 3
2016-12-15
Information technology — MPEG
audio technologies —
Part 1:
MPEG Surround
AMENDMENT 3: MPEG Surround
extension for 3D Audio
Technologies de l’information — Technologies audio MPEG —
Partie 1: Ambiance MPEG
AMENDEMENT 3: Extension de l’ambiance MPEG pour audio 3D
Reference number
ISO/IEC 23003-1:2007/Amd.3:2016(E)
©
ISO/IEC 2016
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
Foreword
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ISO/IEC JTC 1.
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The committee responsible for this document is ISO/IEC JTC 1, Information technology, SC 29, Coding of
audio, picture, multimedia and hypermedia information.
© ISO/IEC 2016 – All rights reserved iii
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
Information technology — MPEG audio technologies —
Part 1:
MPEG Surround
AMENDMENT 3: MPEG Surround extension for 3D Audio
Page 3, 3.1
Add the following after 3.1.12:
3.1.13
N-N/2-N configuration
configuration of MPEG Surround coding system that recreated N channels from half of N downmixed
channels with the corresponding spatial parameters
Pages 3 and 4, 3.1
Renumber the terms 3.1.13 to 3.1.26 as 3.1.14 to 3.1.27.
Page 6, 3.5
Add the following variables:
I is unity matrix and subscript index indicate matrix dimension, e.g. N by N
N
unity matrix.
O is null matrix and subscript index indicate matrix dimension, e.g. N by N null matrix.
N
Add a new Clause 10
10 Outline
10.1 General
The decoding process for N-N/2-N is described in the following clause.
10.2 Syntax
10.2.1 Payloads for N-N/2-N Extension
Table 10.1 — Syntax of SpatialSpecificConfig()
Syntax No. of bits Mnemonic
SpatialSpecificConfig()
{
bsSamplingFrequencyIndex;
4 uimsbf
if (bsSamplingFrequencyIndex == 0xf ) {
NOTE 1 SpeakerConfig3d() is defined in ISO/IEC 23008-3:2015, Table 5.
NOTE 2 numOttBoxes and numTttBoxes are defined by Table 10.2 dependent on bsTreeConfig.
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
Table 10.1 (continued)
Syntax No. of bits Mnemonic
bsSamplingFrequency;
24 uimsbf
}
bsFrameLength;
7 uimsbf
bsFreqRes;
3 uimsbf
bsTreeConfig; 4 uimsbf
if (bsTreeConfig == ‘0111’) {
bsNumInCh;
4 uimsbf
bsNumLFE
2 uimsbf
bsHasSpeakerConfig
1 uimsbf
if (bsHasSpeakerConfig == 1 ) {
audioChannelLayout = SpeakerConfig3d();
Note 1
}
}
bsQuantMode;
2 uimsbf
bsOneIcc;
1 uimsbf
bsArbitraryDownmix; 1 uimsbf
bsFixedGainSur;
3 uimsbf
bsFixedGainLFE;
3 uimsbf
bsFixedGainDMX;
3 uimsbf
bsMatrixMode;
1 uimsbf
bsTempShapeConfig;
2 uimsbf
bsDecorrConfig; 2 uimsbf
bs3DaudioMode;
1 uimsbf
if ( bsTreeConfig == ‘0111’ ) {
for (i=0; i< NumInCh - NumLfe; i++) {
defaultCld[i] = 1;
ottModelfe[i] = 0;
}
for (i= NumInCh - NumLfe; i< NumInCh; i++) {
defaultCld[i] = 1;
ottModelfe[i] = 1;
}
}
for (i=0; i
Note 2
OttConfig(i);
}
for (i=0; i
Note 2
TttConfig(i);
}
NOTE 1 SpeakerConfig3d() is defined in ISO/IEC 23008-3:2015, Table 5.
NOTE 2 numOttBoxes and numTttBoxes are defined by Table 10.2 dependent on bsTreeConfig.
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
Table 10.1 (continued)
Syntax No. of bits Mnemonic
if (bsTempShapeConfig == 2) {
bsEnvQuantMode
1 uimsbf
}
if (bs3DaudioMode) {
bs3DaudioHRTFset; 2 uimsbf
if (bs3DaudioHRTFset==0) {
ParamHRTFset();
}
}
ByteAlign();
SpatialExtensionConfig();
}
NOTE 1 SpeakerConfig3d() is defined in ISO/IEC 23008-3:2015, Table 5.
NOTE 2 numOttBoxes and numTttBoxes are defined by Table 10.2 dependent on bsTreeConfig.
Table 10.2 — bsTreeConfig
bsTreeConfig Meaning
0,1,2,3,4,5,6 Identical meaning in ISO/IEC 20003-1:2007, Table 40
7 N-N/2-N configuration
numOttBoxes = NumInCh
numTttBoxes = 0
numInChan = NumInCh
numOutChan = NumOutCh
output channel ordering is according to Table 10.5
8…15 Reserved
bsNumInCh Defines number of input DMX channels for N-N/2-N configuration according to:
Table 10.3 — bsNumInCh
bsNumInCh NumInCh NumOutCh
0 12 24
1 7 14
2 5 10
3 6 12
4 8 16
5 9 18
6 10 20
7 11 22
8 13 26
9 14 28
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
Table 10.3 (continued)
bsNumInCh NumInCh NumOutCh
10 15 30
11 16 32
12,…,15 Reserved Reserved
bsNumLfe
Defines number N of output Lfe channels for N-N/2-N configuration
LFE
Table 10.4 — bsNumLFE
bsNumLFE NumLfe
0 0
1 1
2 2
3 Reserved
Table 10.5 — Output channel ordering for N-N/2-N configuration
NumOutCh NumLfe Output channel ordering
24 2 Rv,Rb,Lv,Lb,Rs,Rvr,Lsr,Lvr,Rss,Rvss,Lss,Lvss,Rc,R,
Lc,L,Ts,Cs,Cb,Cvr, C,LFE,Cv,LFE2,
14 0 L,Ls,R,Rs,Lbs,Lvs,Rbs,Rvs,Lv,Rv, Cv,Ts, C,LFE
12 1 L,Lv,R,Rv,Lsr,Lvr,Rsr,Rvr,Lss,Rss,C,LFE
12 2 L,Lv,R,Rv,Ls,Lss,Rs,Rss,C,LFE,Cvr,LFE2
10 1 L,Lv,R,Rv,Lsr,Lvr,Rsr,Rvr,C,LFE
NOTE 1 All of Names and layouts of loudspeaker follows the naming and position in
ISO/IEC 23001-8:2013/FDAM1, Table 8.
NOTE 2 Output channel ordering for the case of 16, 20, 22, 26, 30 and 32 is following the
arbitrary order from 1 to N without any specific naming of speaker layouts.
NOTE 3 Output channel ordering for the case when bsHasSpeakerConfig == 1 follows
the order from 1 to N with associated naming of speaker layouts as specified in
ISO/IEC 23008-3:2015, Table 94.
bsHasSpeakerConfig This flag indicates whether the output channels have a different layout than
the output channel ordering specified in Table 10.5. If present (bsHasSpeaker-
Config == 1), the loudspeaker layout of the output configuration “audioChan-
nelLayout” can be used for rendering if the N-N/2-N system is used together
with other MPEG standards (e.g. ISO/IEC 23008-3:2015).
audioChannelLayout This structure describes the loudspeaker layout of the output configuration.
If the output configuration contains LFE channels, the LFE channels shall be
ordered such that each LFE channel is processed together with one non-LFE
channel using one OTT box and shall be positioned at the end of the channel
list (e.g. L, Lv, R, Rv, Ls, Lss, Rs, Rss, C, LFE, Cvr, LFE2).
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
10.3 The N-N/2-N configuration
10.3.1 Introduction
In the following subclauses, the general structure for the N-N/2-N system is outlined. For this
configuration, N/2 is identical to the number of downmix signals (NumInCh = N/2), denoted x to
0
x . Therefore, the number of output signals (i.e. N) should be an even number in order to
NumInCh−1
process N/2 downmix signals, since the number of OTT boxes is equal to N/2.
nk,
The input vector to be multiplied by M is a vector containing the N/2 downmix channels. A maximum
1
number of N/2 decorrelators can be used when LFE channels are not included in output channels.
However, if the number of output channels exceeds twenty channels, the de-correlation filters are
reused according to 10.7. Some of the decorrelator indices are repeated because the number of available
decorrelators that ensure orthogonal decorrelated output signals is limited to 10, as defined in
ISO/IEC 23003-1:2007. Therefore, the recommended number of output channels for the N-N/2-N
configuration is less than 20 (or 24 with two Lfe channels).
The outputs of the decorrelators can be replaced by residual signals for certain frequency regions,
depending on the bitstream. No decorrelation is used for the case of OTT based upmix when a LFE
channel is one output of the OTT box. No residual signal can be inserted for these OTT boxes.
Figure 10.1 — Matrix view of the spatial audio processing for the N-N/2-N configuration
The decorrelators, decorrelated signals and residual signals in Figure 10.1 (labelled “1” to “M (i.e.
NumInCh-NumLfe)”) correspond to different OTT boxes depending on configuration.
The multi-channel reconstruction for the N-N/2-N configuration can also be visualized by means of a
tree-structure. This is outlined in Figure 10.2. In Figure 10.2, every OTT box re-creates two channels
based on one input channel, the corresponding CLD and ICC parameters, and residual signal. The
OTT boxes and the corresponding data are numbered corresponding to the order they appear in the
bitstream.
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
Figure 10.2 — Tree structure view of the spatial audio processing for the N-N/2-N
configurations
nk,
The definitions of the vectors and matrices for N-N/2-N configuration are used. The matrixes M and
1
nk,
M are defined accordingly in 10.5 and 10.6, while the vectors to be multiplied with the matrices in
2
order to form the output are defined in the following subclauses.
10.4 Vector definitions for the N-N/2-N configuration
10.4.1 Operation without temporal shaping tools
nk,
For the N-N/2-N configuration, the input signals to the decorrelators are defined by v , which is
nk, nk,
derived from the input vector x and the matrix M having N rows and 1 column, according to:
1
nk,
x
nk,
M v
0
M
nk,
0
x
nk,
M
1
v
M
...
1
nk,
...
x
M
NumInCh-1
nk,,nk nk,,nk nk,
vM==xM nk,
= v
11 x
M
ArtDmmx
NumInCh−1
res
0 nk,
v
nk,
0
x
n,,k
ArtDmx
v
res
1 1
... ...
nk, nk,
x v
NumInChN−−umLfe 1
ArtDmx
res
NumInCh-1
nk,
The subscripts for the different elements in the v vector indicate which OTT box decorrelator the
nk, nk,
signal is input to, with the exception from v tov , which is the direct signal.
M M
0 NumInChN−−umLfe 1
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ISO/IEC 23003-1:2007/Amd.3:2016(E)
nk,
The vector w holding the direct signal, decorrelated signals, and the residual signals is defined
according to:
nk,
v
M
0
nk,
v
M
1
...
nk,
...
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