Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-06-27
1991-07-09
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 26, H04N 970
Patent
active
050310313
ABSTRACT:
A video signal processing apparatus for processing a video signal including SYNC pulses, a time-compressed color difference and luminance signals, compression factors of those signals being different from each other, the color difference signal and luminance signals being transmitted sequentially for one horizontal line for simultaneously outputting time-reproduced color difference and luminance signals comprises: first and second time-expansion circuits for producing the time-reproduced luminance and color difference signals in response to first and second clocks respectively; a switching circuit for selectively outputting the time-reproduced color difference signal in response to a control signal; a PLL responsive to the video signal including a frequency dividing circuit for producing the first and second clocks, and a synthesized SYNC pulse; and a phase detecting circuit for detecting a phase relation between the video signal and the synthesized SYNC pulse to produce the control signal. When the PLL is out of phase with the SYNC pulse, i.e., not locked, the switch does not transfer the color difference signal from the second time-expansion circuit, preventing time-reproduced signals from producing a double image on a display.
REFERENCES:
Funkschau 6/1987, Munich, Herbert Noll "Alles auf einem Chip", pp. 24-26.
Rundfunktechnische Mitteilungen RTM 1/85, Hamburg, Christoph Dosch, "C-Mac/Paket-Normvorschlag der europaischen Rundfunkunion fur den Satellitenrundfunk", pp. 23-35.
Chin Tommy P.
Harvey David E.
Matsushita Electric - Industrial Co., Ltd.
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