Automatic low frequency gain limited circuit for eliminating sig

Details Automatic low frequency gain limited circuit for eliminating sig Automatic low frequency gain limited circuit for eliminating sig

1975-06-16

1976-08-17

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178 73R, H04N 520, H04N 552

Patent

active

039755860

ABSTRACT:
A means of eliminating signal suppression in an A-C coupled video process system by an automatic low frequency gain limiting circuit means. The low frequency gain limiting circuit means comprises a summing amplifier that simultaneously sums the original video pulses and inverted pulses of the low frequency pedestal portion of the video pulses with the detail information removed therefrom. The resulting gain limited output video voltage from the summing amplifier is confined within the linear dynamic range of the video processing system and comprises a compressed pedestal height that nevertheless has all the detail information thereon. The gain limited output video voltage is applied to a display driver.

REFERENCES:
patent: 3396236 (1968-08-01), Foster
patent: 3458652 (1969-07-01), McMann, Jr.

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