Video signal processing circuit

Details Video signal processing circuit Video signal processing circuit

1987-09-16

1989-08-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 514

Patent

active

048537837

ABSTRACT:
A video signal processing circuit for aperture correction or picture restoration having a high frequency range emphasis filter which provides a signal whose high frequency range emphasized, a plurality of delay circuits connected serially which output signals having different delay times and a selector which effects level comparison among the input signal the output signals with delays and which supplies the maximum or minimum of them to a first limiter as its threshold level and the minimum or maximum of them to a second limiter as its threshold level. The first limiter limits the high frequency range emphasized signal and the second limiter limits the output signal of the first limiter. A high frequency component extraction circuit and a noise suppressor which suppress noise in high frequency component and adder which adds together the output of the second limiter and the output of the noise suppressor may be used.

REFERENCES:
patent: 3878323 (1975-04-01), Fisher
patent: 4541014 (1985-09-01), Yagi

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