Digital television signal processing system including a co-chann

Details Digital television signal processing system including a co-chann Digital television signal processing system including a co-chann

1994-11-25

1996-08-27

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348471, 348726, 375233, H04N 5445, H04N 5213

Patent

active

055505961

ABSTRACT:
A digital signal proces sing system for receiving and processing a high definition television signal, eg., in a Pulse Amplitude Modulation (PAM) format, includes a filter for rejecting interferer signals such as a narrowband continuous wave NTSC co-channel interferer. In an illustrated embodiment the rejection filter is a digital FIR filter (18) located after a (de)rotator (16) in a carrier recovery network (16, 20, 24, 26, 28). The filter exhibits a zero throughput delay bandpass response with attenuation notches for rejecting NTSC co-channel picture and chrominance baseband carrier frequencies.

REFERENCES:
patent: 5087975 (1992-02-01), Citta et al.
patent: 5132797 (1992-07-01), Citta
patent: 5134464 (1992-07-01), Basile et al.
patent: 5325188 (1994-06-01), Scarpa
patent: 5345476 (1994-09-01), Tsujimoto
patent: 5367536 (1994-11-01), Tsujimoto
patent: 5386239 (1995-01-01), Wang et al.
"VSB Transmission System", Zenith Corporation, Dec. 1993, pp. 1-25.
Digital Communication, by Lee and Messerschmitt, Kluwer Academic Publishers, Copyright 1988, pp. 184-186.
1994 Proceedings of the National Association of Broadcasters, 48th Annual Engineering Conference Proceedings, Mar. 20-24, 1994 contains Grand Alliance HDTV System Specification Draft.
Performance of Equalization Techniques in a Radio Interference Environment, by Niger et al., IEEE Transactions on Communications vol. 39, No. 3, Mar. 1991.

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