ISO/IEC TR 13818-5:1997/Amd 1:1999/Cor 1:2003

TECHNICAL REPORT ISO/IEC TR 13818-5:1997/Amd.1:1999
TECHNICAL CORRIGENDUM 1
Published 2003-11-01

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
INTERNATIONAL ELECTROTECHNICAL COMMISSION • МЕЖДУНАРОДНАЯ ЭЛЕКТРОТЕХНИЧЕСКАЯ КОМИССИЯ • COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE


Information technology — Generic coding of moving pictures
and associated audio information —
Part 5:
Software simulation
AMENDMENT 1: Advanced Audio Coding (AAC)
TECHNICAL CORRIGENDUM 1
Technologies de l'information — Codage générique des images animées et des informations sonores
associées —
Partie 5: Simulation de logiciel
AMENDEMENT 1: Codage audio avancé (AAC)
RECTIFICATIF TECHNIQUE 1
Technical Corrigendum 1 to ISO/IEC TR 13818-5:1997/Amd.1:1999 was prepared by Joint Technical
Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia
and hypermedia information.

ICS 35.040 Ref. No. ISO/IEC TR 13818-5:1997/Amd.1:1999/Cor.1:2003(E)
©  ISO/IEC 2003 – All rights reserved
Published in Switzerland

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ISO/IEC TR 13818-5:1997/Amd.1:1999/Cor.1:2003(E)
Replace items 2), 3), 4) and 5) with
“
2) Replace all of Clause 5 (Audio simulation) with:
“
5 Audio simulation
5.1 Layer 1, Layer 2 and Layer 3
This technical report contains the implementation of an ISO/IEC 13818-3 codec. The components of the audio
codec software (distribution 10) are:
• full layer 2 multichannel decoder
• near-full layer 2 multichannel encoder (omits prediction with non-zero delay)
• full layers 1-3 low-sampling frequency encoder and decoder
More details are listed in the Tables 5-1 and 5-2.
5.1.1 Verification of the simulation software
All features which are supported by the multichannel and low sampling frequency encoders have been tested
against the decoders for internal consistency.
Where possible, the test criterion was comparison of the decoder output with an external decoder, otherwise
by informal listening in an audio test environment. The decoder was deemed to have passed when the
decoded PCM samples differed from the reference output by at most one LSB.

2 ©  ISO/IEC 2003 – All rights reserved

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ISO/IEC TR 13818-5:1997/Amd.1:1999/Cor.1:2003(E)
Table 5-1: Summary of audio simulation features for low bitrate coding of multichannel audio

Feature Encoder Decoder
layer 1 no no
layer 2 yes yes
bit rates all all
sample rates 32, 44.1, 48 32, 44.1, 48
16, 22.05, 24 16, 22.05, 24
psychoacoustic model 1 not applicable
multilingual/commentary channels yes yes
lower sampling frequency commentary channels yes yes
low frequency enhancement channel yes yes
channel configurations 3/2, 3/1, 2/0, 3/2, 3/1, 3/0,
2/1, 3+2, 2+2, 2/1, 3+2, 2+2,
2/0, 1/0, 1+1 2/0, 1/0, 1+1
transmission channel allocations 0-7 0-7
dematrix procedures 0-3 0-3
dynamic crosstalk yes yes
prediction non-zero delay yes
phantom coding of centre channel yes yes
extension bitstream yes yes
ancillary data yes yes
CRC yes yes
predistortion yes not applicable
layer 3 no no
compilation environment Unix Unix

©  ISO/IEC 2003 – All rights reserved 3

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ISO/IEC TR 13818-5:1997/Amd.1:1999/Cor.1:2003(E)
Table 5-2: Summary of audio simulation features for extension to lower sampling frequencies

Feature Encoder Decoder
layers 1,2,3 1,2,3
bit rates all all
sample rates 16, 22.05, 24, 16, 22.05, 24,
32, 44.1, 48 32, 44.1, 48
psychoacoustic model 1 not applicable
channel configurations 2/0, 1/0, 1+1 2/0, 1/0, 1+1
joint stereo yes yes
ancillary data no no
CRC yes yes
compilation environment Unix Unix
5.1.2 Software listings
The ISO/IEC TR 13818-5 software for layer 1, layer 2 and layer 3 is included in electronic format with this
document as dist10.tar.gz. It consists of the following parts:
• documentation
• low sampling frequency encoder
• low sampling frequency decoder
• multichannel encoder
• multichannel decoder
• tools
5.2 AAC
This technical report contains the implementation of an ISO/IEC 13
...