Analog-to-digital conversion apparatus for video signal

Details Analog-to-digital conversion apparatus for video signal Analog-to-digital conversion apparatus for video signal

1986-09-19

1988-09-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 13, 358141, 358158, 341155, H04N 713, H04N 504

Patent

active

047745770

ABSTRACT:
An analog-to-digital conversion circuit for converting an input analog video signal to a digital video signal includes a sync separator for deriving from the analog video signal a horizontal synchronizing signal, and a voltage controlled oscillator (VCO) for producing a clock signal. An A/D converter converts the input analog signal to digital video based on the timing of the clock signal. The VCO, which produces the clock signal, is controlled by a circuit which compares the phase of the horizontal synchronizing signal extracted from the digital video signal to the phase of the clock signal. The clock signal is therefore highly stable and free of any adverse effects generated by drifts of the synchronizing signal separator and adverse effects produced by a lowpass filter employed in the circuit.

REFERENCES:
patent: 4647968 (1987-03-01), Willis
patent: 4672447 (1987-06-01), Moring et al.

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