Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1984-03-12
1986-12-09
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 576, H04N 9493
Patent
active
046283692
ABSTRACT:
A video signal dropout compensation circuit is provided in a reproducing apparatus which reproduces a recorded signal from a recording medium recorded with a time-division-multiplexed signal which has been frequency modulated. The apparatus frequency-demodulates a reproduced frequency modulated time-division-multiplexed signal in a demodulator, and time base expands a time base compressed line-sequential color difference signal and a time base compressed luminance signal within a reproduced time-division-mulitplexed signal back to an original time base to obtain a reproduced line-sequential color difference signal and a reproduced luminance signal. The compensation circuit comprises a detecting circuit for producing a dropout detection signal when the reproduced frequency modulated time-division-multiplexed signal assumes a level smaller than a preset level, a switching circuit controlled in response to an output signal of the detecting circuit, and a delay circuit for delaying an output signal of the switching circuit by a delay time of two horizontal scanning periods. The switching circuit selectively supplies to the demodulator and the delay circuit the reproduced frequency modulated time-division-multiplexed signal while the dropout detection signal is not produced from the detecting circuit, and the output signal of the delay circuit while the detecting circuit produces the dropout detection signal.
REFERENCES:
patent: 3586762 (1971-06-01), Hodge et al.
patent: 3781463 (1973-12-01), Bussche
patent: 4199780 (1980-04-01), Taylor
patent: 4245235 (1981-01-01), Poetsch
Ichinoi Yutaka
Nishimoto Naomichi
Richardson Robert L.
Victor Company of Japan Ltd.
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