Digital scan converter

Details Digital scan converter Digital scan converter

1985-12-03

1987-05-26

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358150, 358153, H04N 964

Patent

active

046689745

ABSTRACT:
A digital scan converter having an oscillator providing a clock signal used to scan-convert an input video signal to thereby produce a scan-converted output video signal, an automatic frequency control for controlling the oscillator in synchronism with a synchronizing signal separated from the input video signal and a counter for frequency-dividing the clock signal from the oscillator to thereby form a control signal used for controlling blanking of the input video signal. The counter also provides an address signal for a memory in which the video signal is temporarily stored during the scan converting operation. Since a composite blanking pulse for the input video signal is formed in synchronism with the address signal for the memory, it is possible to prevent appearance of a jitter of the composite blanking pulse on a display screen.

REFERENCES:
patent: 4127873 (1978-11-01), Katagi
patent: 4567521 (1986-01-01), de la Guardia
patent: 4623913 (1986-11-01), Fling

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