Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-10-12
1992-08-04
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358166, 358 36, 358 37, H04N 5213
Patent
active
051363860
ABSTRACT:
A noise canceller circuit is connected in a stage succeeding a picture quality control circuit to which the video signal is input. A noise cancel amount for the video signal can be controlled so as to correspond to the gain in the frequency characteristic at the same time when the adjustment of the frequency characteristic of the video signal is performed in the picture quality control circuit. As a result, the noise cancel amount in the nosie canceller circuit can be controlled correspondingly to the level of the noise component even if a level of the noise component in the video signal is changed when the gain in a certain bandwidth of the video signal is adjusted in the picture quality control circuit. Therefore, the noise component can be cancelled effectively.
REFERENCES:
patent: 3932819 (1976-01-01), Spencer
patent: 4007485 (1977-02-01), Sato
patent: 4667225 (1987-05-01), Kanda
patent: 4768094 (1988-08-01), Ichinoi
Patent Abstracts of Japan, vol. 8, No. 17 (E-223), Jan 25, 1984.
Patent Abstracts of Japan, vol. 12, No. 291 (E-644), Aug. 9, 1988.
Okada Teruo
Shimizu Masato
Britton Howard W.
Hsia Sherrie
Kabushiki Kaisha Toshiba
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