Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1982-02-04
1984-07-10
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330279, 330308, 330134, H03G 708, H03G 318
Patent
active
044595573
ABSTRACT:
A compressor limiter is provided for the processing of audio signals. Fundamentally, the invention includes an amplifier receiving audio input signals and including a photoresistive element in the feedback circuit thereof. The output of the amplifier is provided to a dual stage control voltage generating circuit. The first stage generates a current through a light emitting diode corresponding to the amplitude of the output signal from the amplifier. The light emitting diode sets a threshold for suppression of the output audio signal such that, as light is emitted from the diode, it effects the photoresistor in the feedback circuit of the amplifier, thus adjusting the gain. The other branch of the control voltage generating circuitry comprises a peak detector which is operative for controlling the light emitted from the diode when successive audio signals exceeding the threshold are received in rapid succession.
REFERENCES:
patent: 3379991 (1968-04-01), Clerc et al.
patent: 3620631 (1971-11-01), Stopka et al.
patent: 4030034 (1977-06-01), Ruegg
patent: 4179669 (1979-12-01), Dodson et al.
Rogers, A. C., et al., "AGC Amp. for Beam Profile Monitors", 1971, Particle Accelerator Conference, Accelerator Engn. & Tech., Mar. 1-3, 1971.
Mottola Steven J.
Mullins James B.
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