Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-08-17
1992-06-02
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358147, H04N 514
Patent
active
051191946
ABSTRACT:
A distortion compensation circuit of a VTR detects distortion of an input ramp signal during a blanking period of a reproduced video signal and compensates the distortion of the entire reproduced video signal. The input ramp signal included in the digital reproduced video signal is compared with a comparison ramp signal equal to a ramp signal to be recorded and the difference thereof can be obtained as a compensation data signal. During the blanking period of the reproduced video signal, the compensation data signal is stored in a compensating memory, using the input ramp signal as an address signal, and during a non-blanking period, the contents of the compensating memory are read out, using the reproduced video signal itself as an address signal. The read compensation data signal is added to the reproduced video signal, whereby distortion of the reproduced video signal is compensated.
REFERENCES:
patent: 4408233 (1983-10-01), Nahon
patent: 4503547 (1985-03-01), Summers
patent: 4757392 (1988-07-01), Awamoto
patent: 4991021 (1991-02-01), Nikoh
"Characteristics and Operation of A DLC", National Technical Report, vol. 32, No. 4, issued Aug. 1986, pp. 425-427 (with English translation).
National Technical Report, vol. 32, Aug. 1986 "VTR for High Definition TV of Band Reduction System."
Sagawa Satoru
Yamaguchi Takayoshi
Chin Tommy P.
Conlin David G.
O'Connell Robert F.
Sharp Kabushiki Kaisha
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