Noise measurement for video signals

Details Noise measurement for video signals Noise measurement for video signals

1988-12-20

1989-10-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

324 57N, 358 10, 358 36, 358167, H04N 1700, H04N 1702

Patent

active

048735744

ABSTRACT:
The present invention discloses a noise measurement method and system in a television signal receiver. In the preferred embodiment, the receiver has a noise reduction circuit and receives a composite television picture signal which contains noise, picture information, a trigger pulse (preferably the V-sync pulse), a horizontal synchronizing pulse (at least once per television scan line) and a standard signal adjacent in time to and later than the horizontal synchronizing pulse. The preferred standard signal is a back porch signal or a color burst signal. A comparator receives at least two samples of the standard signal and produces a comparison signal that is representative of the comparison of the two standard signal samples. Preferably the two standard signal samples are from two different scan lines. An accumulator circuit receives the comparison signal and generates a measured noise signal that is used to control the noise reduction circuit.

REFERENCES:
patent: 4172263 (1979-10-01), Tenten
patent: 4535353 (1985-08-01), Turner
patent: 4721997 (1988-01-01), Wittrock

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