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Email: tian@dr.com http://www.digia
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H.261 1.1 H.261 1.2 H.261 1.3 H.261
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1.2 H.261
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1.3 H.261 625 PAL 525NTSC CIF(Com
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CCIR601 ISO/MPEG-1 CCITT H.261 PAL
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CIFQCIF ISDN DCT 4 DCT
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• P=12 QCIF 64kbps 40kbps 16kb
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1.5 H.261
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8*8DCT DCT DCT
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DCT VLC DCT 31
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0-255
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1
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• BCH
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ITU-T SG151990 "ATM " B- ISDN ATM
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DCT " " "
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MPEG ( Moving Picture Expert Group
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2.1 MPEG-1 MPEG-1 MPEG-1 MP
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MPEG-1 SIF VHS CD MPEG-1 1/100-1
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MPEG-1 MPEG 1. VCD 0K 2.
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JPEG H261
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MPEG-1 1. MPEG-1 2. MPEG-1 3.
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MPEG SIF H.261 MPEG 16*16 8*8 DC
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MPEG-1 MPEG-1 Intra pictures
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IBBPBBPBBPBBPBBIBBPBBPBBPBBPBB M
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B 3. B B
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MPEG MPEG MPEG (interpel) (
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( ) DPCM MPEG ( DPCM/DCT )
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MPEG YUV ( ) Y:U:V ( MPEG-2 4:1:1
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(MPEG-lMPEG-2 1616 ) MPEG
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(NN ) 88 (DCT) DCT DCT VLSI
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DCT DPCM DCT DCT MPEG
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MPEG-1 MPEG-l(MPEG-2) MPEG-1 (I
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DCT 88 DCT 64DCT (Q) DCT (DC )
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(SZ) N (VB) (VLD) (QDCT-1 )
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MPEG MPEG MPEG
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MPEG 32kHz44.1kHz48kHz CDDAT PC
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MPEG / MPEG MPEG MPEG
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MPEG MPEG 96kbps CD MPEG-1
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Audio Layer I —— 32 Audio La
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MPEG-1
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Layer III;
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PCM MPEG-1
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2 12 1111 1111 1111 1 MPEG-1
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MPEG-1 MPEG-1
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" " MPEG-1 III III SMR III SMR
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