HDTV transmission system with reduced NTSC co-channel interferen

Details HDTV transmission system with reduced NTSC co-channel interferen HDTV transmission system with reduced NTSC co-channel interferen

1991-12-04

1993-11-02

Shepperd, John

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, H04N 521, H04N 700

Patent

active

052588386

ABSTRACT:
A precoded N-level HDTV digital video signal characterized by a sampling rate fs substantially equal to 3/2 the NTSC color subcarrier frequency is modulated for transmission on a carrier signal having a frequency substantially mid-way between the picture carrier and color subcarrier of an NTSC co-channel. The received signal is detected by a synchronous detector in response to a regenerated carrier signal and interfering NTSC beat components in the output of the detector are attenuated by a comb filter having a notch at fs/3. The output of the comb filter comprises an M-level signal, where M is greater than N, which is converted to an N-level signal corresponding to the demodulated video signal.

REFERENCES:
patent: 4343019 (1982-08-01), Lagoni
patent: 5029002 (1991-07-01), Citta et al.
patent: 5121203 (1992-06-01), Citta

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