1、 INTERNATIONAL STANDARD ISO/IEC 23003-3:2012 TECHNICAL CORRIGENDUM 4 Published 2015-09-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALEInformation technology MPEG audio t
2、echnologies Part 3: Unified speech and audio coding TECHNICAL CORRIGENDUM 4 Technologies de linformation - Technologies audio MPEG Partie 3: Discours unifi et codage audio RECTIFICATIF TECHNIQUE 4 Technical Corrigendum 4 to ISO/IEC 23003-3:2012 was prepared by Joint Technical Committee ISO/IEC JTC 1
3、, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. ICS 35.040 Ref. No. ISO/IEC 23003-3:2012/Cor.4:2015(E) ISO/IEC 2015 All rights reserved Published in Switzerland ISO/IEC 23003-3:2012/Cor.4:2015(E) 2 ISO/IEC 2015 All rights reservedIn 4.5.
4、2 replace: Table 1 Summary of the Location of and Normative Reference to the Definitions of all AAC, HE-AAC and USAC Coding Tools as employed in the Extended High Efficiency AAC profile Tool / Module defined in ISO/IEC sub- claus e USAC AAC LC SBR PS block switching 14496-3 4.6.11 X X window shapes
5、AAC based 14496-3 4.6.11 X X additional USAC 23003-3 X filter bank standard 14496-3 4.6.11 X X time-warped 23003-3 X TNS 14496-3 4.6.9 X X intensity 14496-3 4.6.8.2 NOTE 1 X coupling 14496-3 4.6.8.3 X perceptual noise synthesis PNS 14496-3 4.6.13 NOTE 2 X noise filling 23003-3 X MS basic mid/side co
6、ding 14496-3 4.6.8.1 X X MDCT based complex prediction 23003-3 X quantization non-uniform 14496-3 4.6.1 X X uniform 23003-3 X entropy coding Huffman 14496-3 4.6.3 NOTE 3 X context adaptive arithmetic coding 23003-3 X SBR base 14496-3 4.6.18 X X X enhanced 23003-3 X parametric stereo extension Parame
7、tric Stereo 14496-3 8.6.4 / 8.A NOTE 4 X MPEG Surround 2-1-2 (incl. residual coding) 23003-3 X ACELP 23003-3 X frequency domain noise shaping scale factor based 14496-3 4.6.2 X X LPC based 23003-3 X NOTE 1: Functionality of the AAC LC intensity tool is fully provided by the MDCT based complex predic
8、tion tool of USAC NOTE 2: Functionality of the PNS tool is largely provided by the noise filling tool of USAC NOTE 3: Functionality of the AAC LC Huffman coding tool is fully provided by the context adaptive arithmetic coding tool of USAC NOTE 4: Functionality of the Parametric Stereo tool is fully
9、provided by the MPEG Surround 2-1-2 tool of USACwith: ISO/IEC 23003-3:2012/Cor.4:2015(E) ISO/IEC 2015 All rights reserved 3Table 2 Summary of the Location of and Normative Reference to the Definitions of all AAC, HE-AAC and USAC Coding Tools as employed in the Extended High Efficiency AAC profile Mo
10、dule Tool defined in ISO/IEC sub- claus e USAC AAC LC SBR PS block switching block switching 14496-3 4.6.11 X X window shapes AAC based 14496-3 4.6.11 X X additional USAC 23003-3 6.2.9.3 X filter bank AAC based 14496-3 4.6.11 X X additional USAC 23003-3 7.9 X TNS TNS 14496-3 4.6.9 X X intensity / co
11、upling intensity 14496-3 4.6.8.2 NOTE 1 X coupling 14496-3 4.6.8.3 X perceptual noise synthesis PNS 14496-3 4.6.13 NOTE 2 X noise filling 23003-3 7.2 X MS basic mid/side coding 14496-3 4.6.8.1 X X MDCT based complex prediction 23003-3 7.7.2 X quantization non-uniform 14496-3 4.6.1 X X uniform 23003-
12、3 7.1 X spectral noiseless coding Huffman 14496-3 4.6.3 NOTE 3 X context adaptive arithmetic coding 23003-3 7.4 X SBR base 14496-3 4.6.18 X X X enhanced 23003-3 7.5 X parametric stereo extension Parametric Stereo 14496-3 8.6.4 / 8.A NOTE 4 X MPEG Surround 2-1-2 (incl. residual coding) 23003-3 6.2.13
13、 X ACELP ACELP 23003-3 7.14 X frequency domain noise shaping scale factor based 14496-3 4.6.2 X X LPC based (as part of MDCT based TCX) 23003-3 7.15 X NOTE 1: Functionality of the AAC LC intensity tool is fully provided by the MDCT based complex prediction tool of USAC NOTE 2: Functionality of the P
14、NS tool is largely provided by the noise filling tool of USAC NOTE 3: Functionality of the AAC LC Huffman coding tool is fully provided by the context adaptive arithmetic coding tool of USAC NOTE 4: Functionality of the Parametric Stereo tool is fully provided by the MPEG Surround 2-1-2 tool of USAC
15、In 4.2. replace: The spectral noiseless decoding tool takes information from the bitstream payload demultiplexer, parses that information, decodes the arithmetically coded data, and reconstructs the quantized spectra.The input to this noiseless decoding tool is: with: The context adaptive arithmetic
16、 decoding tool performs the spectral noiseless decoding step. It takes information from the bitstream payload demultiplexer, parses that information, decodes the context ISO/IEC 23003-3:2012/Cor.4:2015(E) 4 ISO/IEC 2015 All rights reservedadaptive arithmetically coded data, and reconstructs the quan
17、tized spectra. The input to this noiseless decoding tool is: In 4.2 remove the following sentence: The use of the noise filling tool is optional. At the end of the first paragraph of 4.5.4 add: Note that for some tools specific restrictions apply, as outlined in the following. In the same subclause
18、replace: All levels include Level 2 of the Baseline USAC profile. with: All levels must support all tools required by the Baseline USAC profile. Support for additional tools is optional. Following the heading “7.11.2.5 All-Pass Decorrelator“ insert a new subclause heading: 7.11.2.5.1 General Followi
19、ng Table 139 insert a new heading: 7.11.2.5.2 Fractional Delay Decorrelator In 6.2.11.1 replace: Spectral coefficients from both the “linear prediction-domain” coded signal and the “frequency- domain” coded signal are scalar quantized and then noiselessly coded by an adaptive context dependent arith
20、metic coder. with: Spectral coefficients from both the “linear prediction-domain” coded signal and the “frequency- domain” coded signal are scalar quantized and then noiselessly coded by a context adaptive arithmetic coder. Also, modify all similar mention of the arithmetic coder accordingly to say
21、“context adaptive arithmetic coder“. In 7.15.1 replace: LPC based frequency-domain noise shaping is then applied to the resulting spectral coefficients and an inverse MDCT transformation is performed to obtain the time-domain synthesis signal. ISO/IEC 23003-3:2012/Cor.4:2015(E) ISO/IEC 2015 All rights reserved 5with: LPC based frequency-domain noise shaping (FDNS) is then applied to the resulting spectral coefficients and an inverse MDCT transformation is performed to obtain the time-domain synthesis signal.
