Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-10-17
1992-06-09
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, H04N 514
Patent
active
051212072
ABSTRACT:
In a digital circuit arrangement for processing an analog video signal, which operates at a fixed system clock not coupled to the video signal, in which the video signal is sampled and which comprises a correction memory (4) and an interpolator with decimator (14) which are used for converting the digital video signal to a synchronizing signal raster predetermined by the system clock, there is provided that the correction memory (4) has a predetermined number of memory sections (5, 6, 7, 8) arranged for storing each the sample values of one picture line which sample values are written or read out at the system clock, that each horizontal synchronizing pulse of the still unconverted video signal triggers a writing process of the subsequent picture line into a memory section (5, 6, 7, 8) and that each horizontal synchronizing pulse derived from the system clock triggers a reading process of the picture line that follows the previously read picture line.
REFERENCES:
patent: 4065787 (1977-12-01), Owen et al.
patent: 4623922 (1986-11-01), Wischermann
patent: 4672447 (1987-06-01), Moring et al.
Goodman Edward W.
Kostak Victor R.
U.S. Philips Corporation
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