Delay circuit

Details Delay circuit Delay circuit

1983-08-08

1985-12-10

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358162, 358166, H04N 514

Patent

active

045583544

ABSTRACT:
A delay circuit, which comprises modulators for effecting contour modulation of an input video signal using a signal from a carrier oscillator as a carrier, delay circuit for delaying the modulation output of the modulators, variable phase shifter for phase shifting the carrier oscillator output signal, demodulators for effecting demodulation by synchronous detection using the output of the variable phase shifter as a synchronizing signal, adder for superimposing a reference signal on a first demodulation of signal from the demodulator corresponding to a first input signal to the modulator and supplying the resultant signal as a second input signal to the modulator, controller for controlling the amount of phase shift by the variable phase shifter according to the reference signal demodulated by the second demodulator, wherein demodulators produce a first demodulated signal delayed behind the first input signal supplied to the modulators by an amount provided by the delay circuit and a second demodulated signal delayed behind the first input signal by double the amount.

REFERENCES:
patent: 3732360 (1973-05-01), Breimer et al.
patent: 3743766 (1973-07-01), Loose et al.
patent: 3780215 (1973-12-01), Shibata
patent: 4291330 (1981-09-01), Hirai
patent: 4481537 (1984-11-01), Tanaka

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