Saturday, March 15, 2008

Table of terrestrial HDTV transmission systems

Main characteristics of three DTTV systems
Systems ATSC DVB-T ISDB-T
Source coding
Video Main Profile syntax of ISO/IEC 13818-2 (MPEG-2 – Video)
Audio ATSC Standard A/52 (Dolby AC-3) As defined in ETSI DVB TS 101 154 - as H.264 AVC and/or ISO/IEC 13818-2 (MPEG-2 – Layer II Audio) and/or Dolby AC-3 ISO/IEC 13818-7 (MPEG-2 – AAC Audio)
Transmission system
Channel coding
Outer coding R-S (207, 187, t = 10) R-S (204, 188, t = 8)
Outer interleaver 52 R-S block convolutional (I=12, M=17, J=1) 12 R-S block
Inner coding rate 2/3 Trellis code PCC: rate 1/2, 2/3, 3/4, 5/6, 7/8; constraint length = 7, Polynomials (octal) = 171, 133
Inner interleaver 12 to 1 Trellis code bit-wise, frequency, selectable time
Data randomization 16-bit PRBS
Modulation 8VSB (Only used for over the air transmission)
16VSB (Designed for cable, but rejected by the cable industry, cable TV uses 64QAM or 256QAM modulation as a de facto standard)		 COFDM
QPSK, 16QAM and 64QAM
Hierarchical modulation: multi-resolution constellation (16QAM and 64QAM)
Guard interval: 1/32, 1/16, 1/8 & 1/4 of OFDM symbol
Two modes: 2k and 8k FFT		 BST-COFDM with 13 frequency segments
DQPSK, QPSK, 16QAM and 64QAM
Hierarchical modulation: choice of three different modulations on each segment
Guard interval: 1/32, 1/16, 1/8 & 1/4 of OFDM symbol
Three modes: 2k, 4k and 8k FFT

TV resolution

Posted by Futuristics at 10:32 PM

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