Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-05-01
1990-05-15
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358158, 358320, 358329, 358337, 360 75, 360 361, 375120, H04N 504
Patent
active
049262602
ABSTRACT:
In order that one clock signal generator in a digital video signal processing circuit comprising a line-coupled clock signal generator and using, for example one or more field memories is sufficient for writing and reading these memories and can still process a signal from a video recorder, the control loop of the clock signal generator uses a comb filter circuit which rapidly corrects regular variations in an output signal of a phase detector of the control loop, which variations are caused by the head drum of the video recorder, without having to adapt the proportioning of a conventional loop filter circuit.
REFERENCES:
patent: Re31326 (1983-07-01), Amery et al.
patent: 4195309 (1980-03-01), Christopher et al.
patent: 4740944 (1988-04-01), Verboom
patent: 4851910 (1989-07-01), Kawai et al.
Brand Simon J.
Frencken Peter H.
Nillesen Antonius H. H. J.
Goodman Edward W.
Parker Michael D.
Shepperd John W.
U.S. Philips Corporation
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