Detection of co-channel interference in digital television signa

Details Detection of co-channel interference in digital television signa Detection of co-channel interference in digital television signa

1995-06-07

1997-01-14

Kostak, Victor R.

Television

Plural transmitter system considerations

348607, 348470, H04N 538

Patent

active

055944965

ABSTRACT:
A receiver receives an ATV (e.g. HDTV) signal in an area that is subject to NTSC co-channel and other interference. The received signal is precoded at the transmitter for enabling reduction of NTSC co-channel interference in the received signal. The received signal includes field sync signals that are successively field combed to produce a subtraction signal. The subtraction signal is comb filtered to reduce NTSC co-channel interference and applied to a comparator along with the unfiltered subtraction signal. The comparator determines whether the level of NTSC co-channel interference is sufficiently great to subject the received ATV signal to comb filtering for reducing the NTSC co-channel interference.

REFERENCES:
patent: 5040063 (1991-08-01), Citta et al.
patent: 5086340 (1992-02-01), Citta et al.
patent: 5452015 (1995-09-01), Hulyalkar
patent: 5512957 (1996-04-01), Hulyalkar

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