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1、ICS 35.040 Ref. No. ISO/IEC 14496-4:2004/Amd.8:2005/Cor.1:2008(E) ISO/IEC 2008 All rights reserved Published in Switzerland INTERNATIONAL STANDARD ISO/IEC 14496-4:2004/Amd.8:2005 TECHNICAL CORRIGENDUM 1 Published 2008-06-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE D
2、E NORMALISATION INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALE Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDEMENT 8: High Efficiency Advanced Audio Coding, audio BIFS, and structured audio conformance TECHNICAL CORRIGENDU
3、M 1 Technologies de linformation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 8: Codage sonore avanc haute efficacit, BIFS sonore et conformit sonore structure RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to ISO/IEC 14496-4:2004/Amd.8:2005 was prepared by Joint Technica
4、l Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. In the electronic attachment, replace the correspondingly named test sequences in SBR_CONFORMANCE_1 with those provided (which have filenames suffixed “new”). ISO/I
5、EC 14496-4:2004/Amd.8:2005/Cor.1:2008(E) 2 ISO/IEC 2008 All rights reserved Page 16, replace Table AMD8-3, SBR Test sequences, with the following table (where the changes are highlighted in grey): file base name content bitrate (kbit/s) QMF Identification QMF Accuracy Envelope Adjuster Accuracy Grid
6、 control tests Header Change Tests Inverse Filtering Tests Additional Sines Tests CRC Diff max RMS max (linear value) test procedure al_sbr_twi none 24 y y - - - - y - - - - al_sbr_qmf Sine Sweep 24 - Y - - - - - - 5 1.4 maxDiff/RMS al_sbr_e rectangle * 10Hz sine 24/48 - - y - - - - y (Note 1) 90 2.
7、0 maxDiff/RMS al_sbr_gh rectangle * 10Hz sine 24/48 - - - y y - - - 51 1.5 maxDiff/RMS al_sbr_i (Note 2) rectangle + noise 24/48 - - - - - y - y (Note 1) 36 3.4 maxDiff/RMS al_sbr_s noise 24 - - - - - - y - 120 1.9 maxDiff/RMS al_sbr_cm (Note 2) music 24-128 - - - - - - - - - - - al_sbr_sig (Note 2)
8、 music 48 - - - - - - - - - - - al_sbr_sr music 24-56 - - - - - - - - - - - Note 1: CRC enabled for 32 kHz testvectors Note 2: The following bitstreams also exist with the suffix _new: al_sbr_i_32_1, al_sbr_i_44_1, al_sbr_i_48_1, al_sbr_cm_48_5.1, al_sbr_sig_24_2_fsaac24_sig1. These are preferred for conformance testing while the ones without this suffix are deprecated. -,-,-