H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/38
H04N 9/00 (2006.01)
Patent
CA 1097795
IMPROVED VIDEO SIGNAL PROCESSOR ABSTRACT OF THE DISCLOSURE An improved video signal processor capable of removing time base errors from video input signals down to a lower range of about 4 nano-seconds and producing color video output signals having an improved signal-to-noise ratio. The processor produces broadcast quality monochro- matic or color video signals from monochromatic, or direct or processed input color video signals reproduced by a V- LOCK signal source. The processor produces monochromatic or color video signals having a substantially reduced time base error from monochromatic or color video signals reproduced by a LINE LOCK video signal source. The processor produces from processed color video signals supplied by a LINE LOCK source color video signals, termed quasi-direct color signals, which are properly phased so that they may be dubbed up to a quadraplex video tape recorder or a capstan servo video tape recorder and reproduced a second time as broadcast quality direct color video signals. An input color processor upstream of an input video amplifier modi- fies input color video signals of the processed color type of synchronize the color components of each incoming line of video information with the input clock reference signal train generated by a voltage controlled oscillator in an input phase lock loop circuit. The input color processor comprises means for separating the incoming processed video signals into chroma and luminance portions, means for converting the chroma signals into equivalent chroma signals which are phase locked to the input clock reference signal -1- train, means for delaying the separated luminance portion by a period equivalent to the delay of the chroma portion of the corresponding line in passing through the converting means, and means for combining the delayed luminance portion with the phase locked chroma signals. The converting means includes means for mixing the separated chroma portions where a first modulation signal train derived from the variable rate input cross reference signals at a first multiple thereof. The converting means also includes a second means for mixing a reference signal train derived from the first portion of successive lines of the incoming color video signals with the second modulation signal train also derived from the variable rate input cross reference signals at a different multiple thereof. A third means for mixing the intermediate signals produced by the first and second mixing means is included to generate chroma signals containing the original chroma information phase locked to the variable rate input clock reference signals. -1a-
251006
Fetherstonhaugh & Co.
Harris Video Systems Inc.
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