Progressive scan television receiver for non-standard signals

Details Progressive scan television receiver for non-standard signals Progressive scan television receiver for non-standard signals

H - Electricity

04

N

350/36, 352/18.3

H04N 7/01 (2006.01) H04N 5/44 (2006.01)

Patent

CA 1231171

ABSTRACT PROGRESSIVE SCAN TELEVISION APPARATUS Phase detectors (202,204) in a progressively scanned television receiver measure the phase of the receiver video speed-up memory read (8fsc) and write (4fsc) clocks with respect to the double line-rate horizontal sweep signal (FB) of the display. Delay means (34,36) are provided for delaying the video signal recovered from the memory (30,32) as a function of the difference (224) between the read and write clock phase measurements each time the memory is read. The delay is effective for minimizing visible-artifacts which otherwise may tend to occur when displaying "non-standard" video signals wherein the ratio of the color-subcarrier frequency to the line-frequency of the incoming video signal differs from a given broadcasting standard.

482633

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