TCM decoder of high definition television receiver and decoding

Details TCM decoder of high definition television receiver and decoding TCM decoder of high definition television receiver and decoding

1998-02-20

1999-11-23

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

348608, H04L 2302, H04N 521

Patent

active

059913410

ABSTRACT:
A trellis-coded modulation (TCM) decoder of a high-definition television (HDTV) receiver is disclosed for use in US-type terrestrial broadcasting, as is a corresponding decoding method. The TCM decoder optionally uses a NTSC-reject comb filter to remove the interference from a co-channel NTSC-type signal. When the input HDTV signal has been passed through the NTSC rejection filter, an 8-state decoding mode is appropriate and a segment sync suspension unit is used to directly connect the data before and after a twelve symbol segment sync. When the input HDTV signal has not been passed through the NTSC rejection filter, an 4-state decoding mode is appropriate and the input HDTV signal is passed unchanged (i.e., without use of the segment sync suspension unit). A field delay directly connects the data of the data segment just before the field sync segment to the data of the data segment just after the field sync segment. A Viterbi decoder decodes the output of the field delay in both an 8-state case and a 4-state case. Therefore, decoding is performed in consideration of the effects of uncoded segment sync and field sync signals, thereby achieving stable decoding.

REFERENCES:
patent: 5508752 (1996-04-01), Kim et al.
patent: 5512957 (1996-04-01), Hulyalkar
patent: 5648822 (1997-07-01), Hulyalkar
patent: 5875001 (1999-02-01), Kwak
"A VLSI Architecture of the Trellis Decoder Block for the Digital HDTV Grand Alliance System"; Dae-il Oh, et al., IEEE Trans. On Consumer Electronics, vol. 42, No. 3, Aug. 1996, pp. 346-355.

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