Delay circuit

Details Delay circuit Delay circuit

1975-04-14

1978-07-04

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 8, H04N 504

Patent

active

040992047

ABSTRACT:
A voltage controlled, active variable delay circuit for pulse signals, and a video signal time base corrector incorporating that variable delay circuit. The variable delay circuit includes a cascaded chain of electronic inverters, each of which has a propagation delay time dependent upon the level of an applied control voltage, and a pulse shaping circuit which regenerates substantially the input pulse waveform. The time base corrector includes a frequency modulator which converts input signals to a square wave having a period dependent upon the input signal level, a voltage controlled, active, variable delay circuit which delays the square wave to correct time base instabilities, a demodulator which converts the delayed square wave to a signal substantially reproducing the input signal waveform with time corrections, an output, and an error detection circuit for applying to the control input of the variable delay circuit a signal indicative of the time error between a reference synchronization signal and the synchronization portion of the time corrected video signals. In a preferred form of time base corrector, an incremental delay circuit is used in conjunction with the variable delay circuit to provide a broader range of available correction.

REFERENCES:
patent: 3454719 (1969-07-01), Horstmann et al.
patent: 3622809 (1971-11-01), Williams
patent: 3631269 (1971-12-01), Monahan
patent: 3644749 (1972-02-01), Wilcox
patent: 3681522 (1972-08-01), Tanabe
patent: 3758711 (1973-09-01), Crosno
patent: 3763317 (1973-10-01), Coleman, Jr. et al.

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