Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-06-16
1979-05-01
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358167, 358905, 325473, H03B 100, H04N 521, H04B 110
Patent
active
041526570
ABSTRACT:
A completely automatic suppression of an echo in a video signal is accomplished by using a multiplying circuit in the amplitude and polarity control of a correction signal which must compensate for the echo and an automatic control of the time delay of the correction signal by means of an echo polarity correction switch with which the polarity of the setting of the delay control characteristic is matched to the polarity of the echo to be suppressed.
REFERENCES:
patent: 3908896 (1975-09-01), Monrolin
patent: 3956585 (1976-05-01), Butler et al.
patent: 3968448 (1976-07-01), Stenning
patent: 4047224 (1977-09-01), Yamaguti
patent: 4053932 (1977-10-01), Yamaguti et al.
Hanneman Henri W. A. M.
Robers Klaas H. J.
Visser Bastiaan
Briody Thomas A.
Cohen Simon L.
Griffin Robert L.
Psitos Aristotelis M.
Streeter William J.
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