Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-06-11
1988-10-04
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358158, 358153, 307510, 307525, 328133, 375118, H04N 504
Patent
active
047758902
ABSTRACT:
A horizontal phase detector of a television apparatus receives an analog composite video signal that is sampled and digitized at a rate determined in accordance with a clock signal. The leading edge of a simulated sync pulse signal is computed from the digitized signal using interpolation. The phase detector also receives a second signal that is indicative of a transition edge of a horizontal oscillator signal. The timing of the transition edge is contained in first and second signal parts. The first part is a periodic signal having a transition edge coincident with that of the clock signal, and the second part is a skew signal that represents a fraction of the period of the clock signal. The leading edge of the computed sync pulse signal is phase-compared with the oscillator transition edge to generate a phase difference signal for synchronizing horizontal oscillator operation.
REFERENCES:
patent: 4264866 (1981-04-01), Benes
patent: 4277754 (1981-07-01), Minakuchi
patent: 4333055 (1982-06-01), Crackel
patent: 4636861 (1987-01-01), Willis
patent: 4639780 (1987-01-01), Willis
A data sheet dated May 1985, entitled Digit 2000 NTSC Double-Scan VLSI TV System that includes a chapter entitled DPU 2532 Deflection Processor Unit, published by ITT Corporation Intermetall Division, pp. 48-72 being included.
A data sheet dated Jun. 1985 entitled Digit 2000 VLSI Digital TV System that includes a chapter entitled DPU 2500 Deflection Processor Unit, published by ITT Corporation, Intermetall Semiconductor Division, West Germany, pp. 111-134 included.
Balaban Alvin R.
Steckler Steven A.
Groody James J.
Henig Sammy S.
Laks Joseph J.
Parker Michael D.
RCA Licensing Corporation
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