Scan converter apparatus

Details Scan converter apparatus Scan converter apparatus

1987-10-21

1989-05-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 11, 358 12, 358141, H04N 1106, H04N 1120, H04N 701, H04N 704

Patent

active

048314412

ABSTRACT:
A scan converter apparatus, for converting an input video signal having a line frequency f.sub.H1 into an output video signal having a line frequency of substantially f.sub.H2, has means for generating a signal with a line frequency m
times the horizontal synchronizing signal of the input video signal by approximating a line frequency ratio of f.sub.H1 /f.sub.H2 to n/m, where m and n are both integers, and controlling the reading operation from a memory in synchronism with the resultant line frequency signal to thereby produce the output video signal, so that even when the line frequency f.sub.H2 is not an integer multiple of the line frequency f.sub.H1, it is possible to satisfactorily obtain the output video signal of which the horizontal line frequency is f.sub.H2.

REFERENCES:
patent: 4075656 (1978-02-01), Beaulier
patent: 4426661 (1984-01-01), Okada et al.
patent: 4583113 (1986-04-01), Pritchard
patent: 4651209 (1987-03-01), Okada et al.
patent: 4658293 (1987-04-01), Arai et al.
patent: 4673981 (1987-06-01), Lippman et al.

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