Device and method in a video recorder for controlling frequency

Details Device and method in a video recorder for controlling frequency Device and method in a video recorder for controlling frequency

1990-12-31

1993-09-14

McElheny, Jr., Donald E.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 980

Patent

active

052454398

ABSTRACT:
A circuit for recording video signals includes: a luminance signal processor for separating a luminance signal from a video signal and frequency modulating the separated luminance signal; a chrominance signal processor, including a color detector, for separating a chrominance signal from a video signal, and amplitude modulating the chrominance signal so as to be distributed in a low frequency band when the chrominance signal is detected by the color detector; a mixer for mixing an output of said luminance signal processor and an output of the luminance signal processor; a recording device for recording an output of the mixer on a record medium; and a frequency characteristic controller for controlling a frequency band of an output of the luminance signal processor corresponding to whether the video signal is a black-and-white signal or a chrominance signal, the frequency characteristic controller being connected between the mixer 40 and the luminance signal processor. Thus, for a color video signal, a color balance is maintained, and for a black-and-white video signal, the frequency characteristic of a video signal is controlled to provide contour resolution.

REFERENCES:
patent: 4068257 (1978-01-01), Hirota et al.
patent: 4077047 (1978-02-01), Yamagiwa
patent: 4430674 (1984-02-01), Taguchi et al.
patent: 4524380 (1985-06-01), Shibata et al.
patent: 4796101 (1989-01-01), Kupfer

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