Title:
衛星伝送と、地上伝送と、ケーブル伝送されたディジタルTVデータを復調し復号化する装置
Document Type and Number:
Japanese Patent JP4780683
Kind Code:
B2
Abstract:
A branch metric computer for the Viterbi decoder of a convolutional decoder primarily intended for use in a multi-channel compressed-digital television receiver capable of receiving FEC data transmitted over satellite, terrestrial and transmission channels. The branch metric computer employs a RAM, having an effective depth of 2x storage locations and an effective storage-location width of 16 m, which is preloaded with two selectively programmed I and two selectively programmed Q lookup tables, wherein each table entry is made up of four m-bit values,. The RAM is designed to operate with either QPSK punctured-coded I and Q signal inputs or any one of a plurality of different PAM or QAM higher alphabet or an 8-PSK pragmatic trellis-coded 2x-bit I and 2x-bit Q signal inputs to the convolutional decoder that are forwarded as signal inputs to the RAM for controlling the particular I and Q lookup-table entries read out from the RAM. The branch metric computer further comprises (1) a group of eight Manhattan-distance metric computing summers organized into first and second sets of four summers for adding certain combinations of the four m-bit I and Q lookup-table entries read out from the RAM and (2) a network including four comparators with each of them forwarding to the Viterbi decoder the lesser sum output from corresponding ones of the summers of the first and second sets.
Inventors:
Kumar Ramas Wami
John Sydney Stewart
John Sydney Stewart
Application Number:
JP2009008104A
Publication Date:
September 28, 2011
Filing Date:
January 16, 2009
Export Citation:
Assignee:
THOMSON CONSUMER ELECTRONICS,INCORPORATED
International Classes:
H04L1/00; H03M13/23; H03M13/41; H04B1/16; H04L27/00; H04L27/18; H04L27/38; H04N5/44; H04N5/455; H04N5/46; H04N7/173; H04N21/2383; H04N21/438
Domestic Patent References:
| JP6232922A |
Other References:
NHK放送技術研究所編,マルチメディア時代のディジタル放送技術事典,日本,丸善株式会社,1994年 6月10日,初版,p.264-271
沖田茂他,符号化変調方式を用いた重み付け伝送方式とその特性,テレビジョン学会技術報告,日本,社団法人テレビジョン学会,1994年 9月30日,第18巻,第52号,p.13-18
A.Morello,FLASH-TV: a flexible bit-rate transmission system for digital HDTV outside broadcasting by satellite,Proceedings of the Global Telecommunications Conference 1993 (GLOBECOM '93),米国,IEEE,1993年11月29日,Vol.3,p.1622-1627
沖田茂他,符号化変調方式を用いた重み付け伝送方式とその特性,テレビジョン学会技術報告,日本,社団法人テレビジョン学会,1994年 9月30日,第18巻,第52号,p.13-18
A.Morello,FLASH-TV: a flexible bit-rate transmission system for digital HDTV outside broadcasting by satellite,Proceedings of the Global Telecommunications Conference 1993 (GLOBECOM '93),米国,IEEE,1993年11月29日,Vol.3,p.1622-1627
Attorney, Agent or Firm:
Riki Kikoshi
Takashi Ishii
Takashi Ishii