Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-01-30
1983-01-04
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358905, H04N 521
Patent
active
043674895
ABSTRACT:
A ghost detection and cancellation system is provided in which the horizontal sync pulses of a first sequence of lines in the vertical retrace interval are used as training signals for the detection and verification of the presence of a ghost signal. This detection procedure results in the development of a signal which reliably indicates the time location of the ghost signal with respect to the main television signal. The location indication signal is then used to select the appropriate tap of a tapped delay line. The delayed video signal from the tapped delay line is then applied to the control amplifier of a ghost canceller for the generation of a pseudo-ghost signal during a subsequent line or lines of the vertical retrace interval. The pseudo-ghost signal is combined with the original video signal to cancel its ghost signal component. By sequentially performing ghost detection and cancellation during numerous lines of the same vertical retrace interval, ghost detection and cancellation is quickly and accurately achieved.
REFERENCES:
patent: 4053932 (1977-10-01), Yamaguti et al.
patent: 4128848 (1978-12-01), Nakagawa
Rasmussen P. J.
RCA Corporation
Richardson Robert L.
Whitacre E. M.
Yorks, Jr. W. B.
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