Title: Automatic low frequency gain limited circuit for eliminating signal suppression in an A-C coupled video processing system

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.

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Inventors: Chow, Sen-Te (Alexandria, VA, US)
Pupich, John J. (Alexandria, VA, US)

Application Number: 587518
Filing Date: 1975-06-16
Publication_date: 1976-08-17
Assignee: The United States of America as represnted by the Secretary of the Army (Washington, DC)
Primary Class(es): 348/255 348/688
Other Classes:
US Patent Ref:

3396236	Aug, 1968	Foster	178/DIG.
3458652	Jul, 1969	McMan, Jr.	178/DIG.

Other Refs:
Primary Examiner: Griffin, Robert L.
Assistant Examiner: Saffian, Mitchell
Attorney: Edelberg; Nathan, Harwell; Max L., Gibson; Robert P.