Progressive scan television receiver with adaptive memory addres

Details Progressive scan television receiver with adaptive memory addres Progressive scan television receiver with adaptive memory addres

1984-06-28

1986-02-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358152, 358160, 358242, H04N 568, H04N 591

Patent

active

045730806

ABSTRACT:
A video input signal is stored in a memory and read twice during a line-interval to provide a processed video output signal having a doubled line rate for display on a display device having a doubled horizontal sweep rate thereby providing a progressively scanned image having reduced visibility of line structure. The last address written in memory is used to control the starting time of the second memory read operation. This reduces the tendency of visible artifacts to occur in cases where the video input signal is "non-standard" in the sense that the ratio of the color subcarrier frequency with respect to the line rate is such that the number of color subcarrier cycles per line may be subject to variation.

REFERENCES:
patent: 4249198 (1981-02-01), Ito et al.
patent: 4364090 (1982-12-01), Wendland
patent: 4400719 (1983-08-01), Powers
patent: 4415931 (1983-11-01), Dischert
patent: 4443821 (1984-04-01), Kato
patent: 4467357 (1984-08-01), Cantou

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