Video equalizing circuit

Details Video equalizing circuit Video equalizing circuit

1991-08-13

1994-01-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

360 65, 358335, H04N 591

Patent

active

052765172

ABSTRACT:
An equalization circuit for a reproduced video signal detects the levels of a reference signal in two different frequency bands and, based on a comparison of the detected levels, selects an equalization curve from a memory and controls the equalization characteristic of an equalizer in the signal path based on the selected equalization curve. For a video frequency signal, low-pass and high-pass filters provide the two frequency bands for level checking and for a radio frequency signal two bandpass filters provide the frequency bands of interest located above and below the center color carrier frequency. A memory contains a number of equalization curves, one of which is selected based upon a comparison using the detected reference signal levels that is performed in a central processing unit.

REFERENCES:
patent: 4484237 (1984-11-01), Muto
patent: 4807056 (1989-02-01), Sasaki et al.
patent: 4928287 (1990-05-01), Tanaka
patent: 5067137 (1991-11-01), Kaneko
patent: 5124850 (1992-06-01), Kitu
J. F. Robinson `Videotape Recording: Theory and Practise` 1981, 3rd Edition, Focal Press, London, GB; Chapter 7, sections: "Equalisers" and The Cosine Equaliser on pp. 123-126.

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