Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-04-28
1991-11-19
Envall, Jr., Roy N.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358310, 358314, 358330, H04N 521, H04N 980
Patent
active
050670263
ABSTRACT:
In a recorder system for recording a video signal, the video signal is modulated by a sine wave FM modulator and is then fed to a delay equalizer for successively rotating a phase of the modulated video signal so that a phase of high order side band components of the modulated video signal is shifted by 180 degrees relative to each other, and is then recorded on a video tape having a characteristic as a limiter. Hence, a moire component can be reduced. In a reproducing system, a reproduced video signal is fed to a filter circuit having a serially-connectred limiter and high-pass filter, a low-pass filter connected parallelly to the limiter, and an adder for adding an output signal of the high-pass filter and an output signal of the low-pass filter. A plurality of the filter circuits are serially connected so that the signal-to-noise ratio (S/N ratio) can be improved.
REFERENCES:
patent: 4007483 (1977-02-01), Pham van Lang
patent: 4345222 (1982-08-01), Cunningham
patent: 4477837 (1984-10-01), Asada
patent: 4510530 (1985-04-01), Miura et al.
Beeching, Steve, "Domestic Videocassette Recorders" Butterworth E. G., 1983, pp. 30-31.
Envall Jr. Roy N.
Frommer William S.
Nguyen Huy
Sinderbrand Alvin
Sony Corporation
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