Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-02-28
1981-06-23
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358184, H04N 544
Patent
active
042754194
ABSTRACT:
A video amplifier, for use with a synchronous detector, employs a first differential amplifier stage, coupled through a level-shifting circuit to the synchronous detector output. A noise-responsive second differential amplifier stage has its output cross connected with the first differential amplifier and is biased to be normally unresponsive. In the event of an inverted noise impulse at the detector output, the second differential amplifier is turned on and its cross-connected output cancels the output of the first differential amplifier, thus canceling the noise impulse. If the noise is strong enough, the output will go into the black video region. This avoids the excess white video noise which results in very undesirable spot blooming.
REFERENCES:
patent: 3624288 (1971-11-01), Hofmann
National Semiconductor Corporation
Richardson Robert L.
Sheridan James A.
Woodward Gail W.
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