Progressive scan display system with correction for non-standard

Details Progressive scan display system with correction for non-standard Progressive scan display system with correction for non-standard

1985-07-31

1986-12-16

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, 358140, 358148, 358152, 358160, 358242, H04N 595

Patent

active

046300988

ABSTRACT:
A double scanning receiver includes a video speed-up memory with read and write clocks locked to multiples of burst. Visible artifacts tend to be produced when displaying non-standard video signals (e.g., from a VCR, game, computer, etc.) due to skew of the memory clock signals with respect to horizontal sync. Skew artifacts are corrected by delaying the output signal of the memory as a direct function of the read clock skew and as an inverse function of the write clock skew. The write clock skew is measured for each memory read and write cycle. The read clock skew for the first memory read cycle is obtained by doubling the write clock skew measured at the start of the first read cycle. The read clock skew for the second memory read cycle is obtained by adding the write clock skew measured at the start of the second read cycle to a measured half-period of the video input signal and doubling the fractional part of the sum thereof. The integer part of the sum is detected to initiate the start of the second memory read cycle.

REFERENCES:
patent: 4400719 (1983-08-01), Powers
patent: 4415931 (1983-11-01), Dischert
patent: 4573080 (1986-02-01), Maze
patent: 4587557 (1986-05-01), Doornhein
patent: 4593315 (1986-06-01), Willis
DataBook "Digit 2000 NTSC Double-Scan VLSI Digital TV System", published by ITT Intermetall Edition 1985/5, pp. 41-45, 47-72.

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