GOST R 54712-2011 Digital Sound Broadcasting Sound broadcasting signals- coding with redundancy reduction for digital communication MPEG-2 a part III (MPEG-2 audio)《数字声音广播 数字通信冗余度压.pdf

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1、 5471220112014 MPEG-2 III (MPEG-2 audIo)ISO/IEC 13818=3:1998(NEQ ) 5471220111 - - - ( )2 480 3 - 13 2011 . 873-4 / 13818-3:1998 . - . III. (ISO/IEC 138183:1998 Information technology Generic coding of moving pictures and associated audio information Part III. Audio) 15 1.02012 ( 8). ( 1 ) , -. () nu

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4、G-2 audIo)Digital sound broadcasting.Coding of sound broadcasting signals with redundancy reduction for transfer on digital communication channels. MPEG-2 part III (MPEG-2 audio) 201307011 ( 64 / ), , 2, I, II III 54711 (Fs): 16 , 22,05 24 . 7,5 , 10,3 11,25 , - ( 52742 53537)., 54711 , , - . , MPEG

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8、 x, x 0;Sign (x) = 0, x = 0;Sign (x) = -1, x = . . 4) / 5slen2 = (scalefac_compress 4) % 5slen3 = (scalefac_compress % 16) 2slen4 = scalefac_compress % 4preflag = 0block_type mixed_block_flag nr_of_sfb1 nr_of_sfb2 nr_of_sfb3 nr_of_sfb400,01,11 x 6 5 5 510 0 9 9 9 910 1 6 9 9 9if (400 2) / 5slen2 = (

9、scalefac_compress400) 2) % 5slen3 = (scalefac_compress400) % 4slen4 = 0preflag = 0block_type mixed_block_flag nr_of_sfb1 nr_of_sfb2 nr_of_sfb3 nr_of_sfb400,01,11 x 6 5 7 310 0 9 9 12 610 1 6 9 12 6if (500 1if (int_scalefac_compress 4slen2 = (int_scalefac_compress180) % 16) 2slen3 = (int_scalefac_compress180) % 4slen4 = 0preflag = 0 54712201113block_type mixed_block_flag nr_of_sfb1 nr_of_sfb2 nr_of_sfb3 nr_of_sfb400,01,11 x 6 6 6 310 0 12 9 9 610 1 6 12 9 6if (244 = int_scalefac_compress) - (CRC), 16 , ( );- , II (BAL), - (SCFSI), (SCF) ;- , - , .

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