Noise eliminator for television synchronizing signal...

Details Noise eliminator for television synchronizing signal... Noise eliminator for television synchronizing signal...

H - Electricity

04

N

350/83

H04N 5/16 (2006.01) H04N 5/213 (2006.01)

Patent

CA 1139876

-8- NOISE ELIMINATOR FOR TELEVISION SYNCHRONIZING SIGNAL SEPARATING CIRCUITS Abstract of the Disclosure A circuit for reducing the effects of negative-going impulse noise in composite television video signals has on sync separators is disclosed. A variable output current source is used to supply rundown current to a dc restorer in a sync separator. A retriggerable monostable multivibrator is triggered by negative-going impulse spikes in the composite video signal. The output of this multivibrator is coupled to the current source to increase its output and therefore decrease the time required for the dc restorer to recover from the negative spike.

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