Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1976-12-02
1978-07-18
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
179 1VL, 330 86, 330134, 330145, 330282, 330284, H03G 102
Patent
active
041018435
ABSTRACT:
A sensitivity control circuit is described for use with a sound movie camera having an automatic sound level control circuit. In one embodiment, the automatic sound level control circuit includes a pair of cascaded amplifiers whose overall gain is controlled by the conduction of an active control element. The active control element has an input terminal which receives a control signal representative of the amplitude of the signal output of the cascaded amplifiers. To desensitize the automatic sound level control circuit to background noise, a voltage source and a variable impedance element are serially coupled to the control terminal of the active control element to provide a control current for selectably varying the conduction of the active control element. The gain of the cascaded amplifiers is thereby selectively controlled and the sensitivity of the automatic sound level control circuit is reduced.
REFERENCES:
patent: 3098199 (1963-07-01), Carney et al.
patent: 3416094 (1968-12-01), Nakamura
patent: 3665332 (1972-05-01), Campbell
patent: 3725800 (1973-04-01), Papay
Fitz-Gerald Roger M.
Moore John H.
Mullins James B.
Nihon Beru-Haueru Kabushiki Kaisha
Passman Aaron
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