Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-07-27
1986-10-21
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358166, 358340, H04N 5213
Patent
active
046188932
ABSTRACT:
A noise reducing system for a video signal, comprises a vertical pre-emphasis circuit supplied with an input video signal which is to be transmitted, for pre-emphasizing the input video signal and transmitting a pre-emphasized video signal to a transmitting system, and a vertical de-emphasis circuit supplied with a pre-emphasized video signal which is pre-emphasized by the vertical pre-emphasis circuit and is transmitted through the transmitting system, for de-emphasizing the pre-emphasized video signal. The vertical pre-emphasis circuit has a non-linear pre-emphasis characteristic for relatively emphasizing a high-frequency component of the input video signal in a vertical spatial frequency of a picture compared to a low-frequency component of the input video signal, with the degree of emphasis being reduced as the level of the input video signal increases. The vertical de-emphasis circuit has a non-linear de-emphasis characteristic for relatively attenuating a high-frequency component of the pre-emphasized video signal in a vertical spatial frequency of the picture compared to a low-frequency component of the pre-emphasized video signal, with the degree of attenuation being reduced as the level of the pre-emphasized video signal increases.
REFERENCES:
patent: 4007483 (1977-02-01), Phan Van Cang
patent: 4200889 (1980-04-01), Strobele
patent: 4281346 (1981-07-01), Strobele
patent: 4451746 (1984-05-01), Hirose
patent: 4481547 (1984-11-01), Sato
Hirota Akira
Tsushima Takuya
Chin Tommy P.
Meller Michael N.
Victor Company of Japan Ltd.
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