NTSC interference detectors using comb filters that suppress HDT

Details NTSC interference detectors using comb filters that suppress HDT NTSC interference detectors using comb filters that suppress HDT

1996-10-02

1998-08-25

Kostak, Victor R.

Television

Receiver circuitry

Demodulator

348 21, 348607, H04N 538

Patent

active

057988030

ABSTRACT:
Post-coder selection circuitry uses an NTSC interference detector for controlling the selection of whether post-coding is to precede trellis decoding in an HDTV receiver. The NTSC interference detector includes an NTSC extracting filter for supplying an NTSC extracting filter response that separates accompanying co-channel interfering NTSC signal component from the received I-channel baseband signal including its direct bias component. The NTSC interference detector includes a comparing portion for periodically integrating the NTSC extracting filter response and deciding whether the co-channel interfering NTSC signal component from the I-channel baseband signal is above a first reference value or not. The NTSC interference detector also includes a control signal generator for accumulating the signal supplied from the comparing portion for each integration period, deciding the presence or absence of the co-channel interfering NTSC signal components according to a second reference value, and supplying a control signal having first or second condition according to the presence or absence respectively of the co-channel interfering NTSC signal component. A post-coder for the received I-channel signal is enabled in response to the first condition of the control signal and disabled in response to the second condition of the control signal.

REFERENCES:
patent: 5260793 (1993-11-01), Citta et al.
patent: 5479449 (1995-12-01), Patel et al.
patent: 5512957 (1996-04-01), Hulyalkar
patent: 5546132 (1996-08-01), Kim et al.
patent: 5594496 (1997-01-01), Nielsen et al.
patent: 5602602 (1997-02-01), Hulyalkar

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