NTSC co-channel interference reduction system

Details NTSC co-channel interference reduction system NTSC co-channel interference reduction system

1995-12-19

1998-10-13

Kostak, Victor R.

Television

Plural transmitter system considerations

348470, H04N 538

Patent

active

058219889

ABSTRACT:
A digital television receiver operating in the presence of an NTSC co-channel signal includes an NTSC rejection filter that is selectively inserted in the digital television signal path to minimize interference from the NTSC co-channel signal. The energy around the NTSC picture carrier is sampled. This is compared with sampled white noise energy between the NTSC picture and color carriers, after field combing the digital television signal to eliminate the effects of static signals. The comparison is used to determine whether or not the NTSC rejection filter is inserted in the digital television signal path.

REFERENCES:
patent: 5602602 (1997-02-01), Hulyalkar
"VSB Transmission System", Zenith Electronics Corporation, Dec., 1993; pp. 1-27.

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