Automatic low frequency gain limiting by addition method in vide

Details Automatic low frequency gain limiting by addition method in vide Automatic low frequency gain limiting by addition method in vide

1976-01-19

1977-07-26

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

178 6, 178 71, H04N 514

Patent

active

040386880

ABSTRACT:
A low frequency gain limiting circuit for an AC coupled video processing tem wherein if the low frequency portion of video signals exceed a certain level, the low frequency pedestal is clipped and fed directly to a summing amplifier while simultaneously the low frequency pedestal is differentially compared in a differential amplifier with the original video signals and the resulting short pedestal with the high frequency detail remaining thereon is passed through a high pass filter before application of the high frequency detail only at a second input to the summing amplifier. The addition of the high frequency detail back onto the low frequency pedestal within the summing amplifier provides the gain limited video signal. A video signal comprising low frequency pedestals with amplitudes within the certain level are fed directly through the summing amplifier but no signal will be present at the output of the differential amplifier since both signals cancel.

REFERENCES:
patent: 3591713 (1971-07-01), Olsson et al.
patent: 3813486 (1974-05-01), Knowles
patent: 3935382 (1976-01-01), Hunt
patent: 3936598 (1976-02-01), Newitt

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