Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-11-06
1985-09-10
Murray, Richard
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 9491
Patent
active
045410186
ABSTRACT:
A dropout compensation circuit for a reproduced video signal in a reproducing apparatus for reproducing a composite color video signal recorded in a recording medium, wherein the composite color video signal consists of a luminance signal occupying a predetermined frequency band and a carrier chrominance signal multiplexed with a common frequency band at a high frequency part of the luminance signal, comprises an amplitude modulator for amplitude-modulating a carrier by a reproduced composite color video signal, a delay circuit having a frequency band for passing a part excluding a higher frequency part of an upper side band and a lower frequency part of a lower side band of an output amplitude-modulated signal of the amplitude modulator, and delaying the signal by a predetermined delay time, a demodulating circuit for demodulating an output amplitude-modulated signal of the delay circuit, a detection circuit for detecting dropout within the reproduced composite color video signal, a switching circuit switched over by an output of the detection circuit, for passing and supplying the reproduced composite color video signal when dropout is not detected, and passing and supplying an output signal of the demodulating circuit when dropout is detected, and a circuit for obtaining a luminance signal compensated of the dropout from the signal passed through the switching circuit.
REFERENCES:
patent: 3463874 (1969-08-01), Hodge et al.
patent: 3969757 (1976-07-01), Amery
patent: 4032966 (1977-06-01), Kenney et al.
patent: 4218696 (1980-08-01), Ushio et al.
Bernat Louis
Murray Richard
Victor Company of Japan Ltd.
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