Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-08-31
1991-09-03
Orsino, Joseph A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358443, 358409, H04N 104
Patent
active
050459511
ABSTRACT:
A video signal processing circuit for a video printer operating to sample an analog video signal, to convert the video signal into digital data, to store the data in a memory, and to read out the contents of memory to a printer for printing. The circuit includes an oscillation circuit which generates a pixel clock in response to the horizontal sync signal in the video signal, a frequency division phase shift circuit which divides the frequency of the pixel clock provided by the oscillation circuit and shifts the frequency divided clock with the pixel clock, a selection circuit which selects one of frequency divided clocks having different phases provided by the frequency division phase shift circuit, and a selection control circuit which operates on the selection circuit to alter the clock selection at each arrival of vertical sync signal, so that the sampling of the video signal is implemented in response to the clock output of the selection control circuit.
REFERENCES:
patent: 4492985 (1985-01-01), Sato et al.
patent: 4563700 (1986-01-01), Sato
patent: 4796095 (1989-01-01), Shimada
patent: 4833445 (1989-05-01), Buchele
patent: 4912564 (1990-03-01), Saitoh
Hamma Kentaro
Kimura Hiroyuki
Kobori Yasunori
Omata Takashi
Hitachi , Ltd.
Lee Thomas D.
Orsino Joseph A.
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