Automatic DC restorer and gain control

Details Automatic DC restorer and gain control Automatic DC restorer and gain control

1974-04-24

1976-10-19

Martin, John C.

Telegraphy

Systems

Simplex-reversing periodic

178 72, 178 75DC, 178DIG26, H04N 552, H04N 516

Patent

active

039872424

ABSTRACT:
Apparatus for stabilizing the range of black to white level in a signal to a cathode ray tube, especially a signal produced by a detector in a charged particle microscope system. The stabilizing apparatus includes electronic circuitry for remembering the most negative (blackest) excursion of the signal for a predetermined time period, means for stabilizing all video input to that level and means for controlling the range of the signal (black to white) to remain within predetermined limits.

REFERENCES:
patent: 2850627 (1958-08-01), Moore et al.
patent: 3179743 (1965-04-01), Ahrons et al.
patent: 3515803 (1970-06-01), Lorang
patent: 3578908 (1971-05-01), Tompkins
patent: 3597540 (1971-08-01), MacIntyre
patent: 3804981 (1974-04-01), Avins

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