Using special NTSC receiver to detect when co-channel interferin

Details Using special NTSC receiver to detect when co-channel interferin Using special NTSC receiver to detect when co-channel interferin

1997-06-25

1998-12-22

Kostak, Victor R.

Television

Receiver circuitry

348 21, 348558, 348555, H04N 544

Patent

active

058524762

ABSTRACT:
A method for detecting when a digital television signal is accompanied by co-channel interfering NTSC signal of substantial amplitude is described for use in a digital television receiver. The video portion of any co-channel interfering NTSC signal is synchrodyned to baseband, for generating an in-phase demodulation result including first artifacts of the digital television signal, and for generating a quadrature-phase demodulation result including second artifacts of the digital television signal. The quadrature-phase demodulation results are phase shifted by 90.degree. at frequencies in a prescribed frequency range before being linearly combined with the in-phase quadrature-phase demodulation results, to generate a linear combining result substantially free of the first and second artifacts of the digital television signal in the prescribed frequency range. An indication that the digital television signal is accompanied by co-channel interfering NTSC signal of substantial amplitude is generated by detecting whenever the amplitude of the linear combining result exceeds a prescribed value.

REFERENCES:
patent: 5122879 (1992-06-01), Ito
patent: 5546132 (1996-08-01), Kim et al.
patent: 5606579 (1997-02-01), Pastel et al.
patent: 5646698 (1997-07-01), Yang et al.
patent: 5715012 (1998-02-01), Patel et al.

Affiliated with

Also associated with

Rating

Using special NTSC receiver to detect when co-channel interferin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Using special NTSC receiver to detect when co-channel interferin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Using special NTSC receiver to detect when co-channel interferin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2051807