Television ghost cancellation system with phase-controlled remod

Details Television ghost cancellation system with phase-controlled remod Television ghost cancellation system with phase-controlled remod

1981-06-16

1982-12-14

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 531

Patent

active

043640931

ABSTRACT:
A television ghost signal cancellation system is provided which compensates for the phase of the ghost carrier signal. A video signal containing a ghost signal component is applied to a variable delay line, which delays the video signal by an amount of time equal to the difference in time between the appearance of the direct video signal and its corresponding ghost signal components. The delayed video signal is modulated by a carrier signal and demodulated by a phase-shifted version of the carrier signal. The carrier signal is phase-shifted for the demodulator by an amount which compensates for the phase difference between the picture carriers of the direct and ghost signals. The demodulated signal is inverted and its amplitude adjusted to produce a pseudo-ghost signal which is substantially equal in amplitude but opposite in polarity to the ghost signal components. The pseudo-ghost signal is summed with the original video signal to cancel the ghost signal components, thereby producing a deghosted video signal.

REFERENCES:
patent: 4047224 (1977-09-01), Yamaguti
patent: 4128848 (1978-12-01), Nakagawa
patent: 4285006 (1981-08-01), Kurahashi et al.
An Article, "A Tutorial on Ghost Cancelling in Television Systems" by W. Ciciora et al., Published in IEEE Trans. CE-25, Feb. 1979, pp. 11 and 12 and FIG. 14.

Affiliated with

Also associated with

Rating

Television ghost cancellation system with phase-controlled remod does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Television ghost cancellation system with phase-controlled remod, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television ghost cancellation system with phase-controlled remod will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1203878