Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-09-21
1992-06-16
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 35, H04N 978
Patent
active
051228670
ABSTRACT:
This invention discloses a video signal processing circuit of a comb filter arrangement for separating and extracting a luminance signal and a chrominance signal from an input video signal including the luminance signal and the chrominance signal. The input video signal is delayed by a delay circuit by a 1H period, and a 1H-delayed signal is supplied to a band-pass filter. The signal having passed through the band-pass filter is added to the original input video signal by an adding circuit. An output from the adding circuit is supplied to a trap circuit and chrominance signal components are eliminated. Meanwhile, the signal having passed through the band-pass filter is eliminated from the input video signal by a subtracting circuit, and an amplitude of an output from the subtracting circuit is attenuated by an attenuating circuit. A signal corresponding to a period corresponding to an amplitude difference in the chrominance signal between the signal having passed through the band-pass filter and the original input video signal before delay is generated by a switching signal generating circuit. A first switching circuit switches the outputs from the adding circuit and the trap circuit, and a second switching circuit switches the original input video signal and an output from the attenuating circuit.
REFERENCES:
patent: 3872498 (1975-03-01), Pritchard
patent: 4050084 (1977-09-01), Rossi
Groody James J.
Kabushiki Kaisha Toshiba
Vu Kim Yen
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