Circuit for accurately extracting the synchronization informatio

Details Circuit for accurately extracting the synchronization informatio Circuit for accurately extracting the synchronization informatio

1976-09-07

1978-04-11

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 508

Patent

active

040841871

ABSTRACT:
A circuit for accurately extracting the synchronization information contained within a composite video waveform includes a means for establishing the back porch level of the waveform to a first voltage through a first feedback loop, a means for establishing the sync tip level of the waveform to a second voltage through a second feedback loop, a means for providing the extracted synchronization information at a time determined midway between the first and second voltages, and a system which achieves these ends. An automatic gain control amplifier is included as a portion of the circuit within the system and whose gain is linearly proportional to the logarithm of the AGC voltage and wherein changes in AGC voltage do not interrupt the DC potentials within the amplifier nor do DC changes change the gain of the amplifier.

REFERENCES:
patent: 3699256 (1972-10-01), Roth
patent: 3706847 (1972-12-01), Smeulers

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