Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-04-09
1998-11-24
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375265, 371 437, 348426, G06F 1110, H03M 1312
Patent
active
058418199
ABSTRACT:
An adaptive trellis decoder seamlessly switches between multiple input signal formats. The trellis decoder employs a code sequence detection system, described in the context of an exemplary Viterbi decoding system, that detects codes in an input interleaved packet data signal. The code sequence detection system also reduces the delay (latency) between the input of encoded data and the output of decoded data. The code sequence detection system provides branch metric values in response to the input interleaved packet data signal which exhibits one of a plurality of signal formats, e.g., partial response and normal formats. A Viterbi decoder decodes the packet data signal to produce a decoded output in response to the branch metric values which include a substantially replicated value associated with one of the formats. The Viterbi decoder includes a comparison network that provides decision data in response to branch metric values associated with the trellis encoded data packets. The decision data is organized by trellis state and by data packet and is associated with trellis state transitions. A traceback network provides decoded data in response to the organized decision data.
REFERENCES:
patent: 5604541 (1997-02-01), Kim et al.
patent: 5666170 (1997-09-01), Stewart
Digital Television Standard for HDTV Transmission, of Apr. 12, 1995 (HDTV Standard), prepared by the US Advanced Television Systems Committee (ATSC), Containing Sections 4.2.4-4.2.6, 10.2.3.8-10.2.3.10, 4.2.6-4.2.7, 10.2.3.9-10.2.3.13, 10.3.2-10.3.3.3 and 10.2.3.9.
TCM In The HDTV Transceiver, by J. Kim et al. of the University of California, Los Angeles.
VSB Modulation Used For Terrestrial And Cable Broadcasts, by G. Sgrignoli et al., published in the I.E.E.E.Transactions on Consumer Electronics, vol. 41, No. 3, Aug. 1995.
Architectural Tradeoffs For Survivor Sequence Memory Management In Viterbi Decoders by G. Feygin et al., published in the I.E.E.E. Transactions on Communications, vol. 41, No. 3, Mar. 1993.
Co-pending U.S. application No. 08/501,334, by J. S. Stewart filed Jul. 12, 1995, entitled "Apparatus For Decoding Video Signals Encoded In Different Formats" (Art Group 2602).
Co-Pending U.S. application, Serial No. 08/501,361, by J. S. Stewart, filed Jul. 12, 1995, entitled "Apparatus For Demodulating And Decoding Video Signals In Different Formats" (Art Group 2614).
Co-pending U.S. application, Serial No. 08/501,752, by J. S. Stewart, filed Jul. 12, 1995, entitled "Apparatus For Demodulating And Decoding Satellite, Terrestrial And Cable Transmitted Digital Television Data" (Art Group 2614).
Caldwell Maurice David
Hu Keren
Lin William Wei-Lian
Burke Alexander J.
Chin Stephen
Gluck Jeffrey W.
Kurdyla Ronald H.
Thomson Multimedia S.A.
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