1980-07-01
1983-03-29
Popek, Joseph A.
179 1P, 179 81B, H04M 160
Patent
active
043784674
ABSTRACT:
An amplifier for use in an audio communication circuit between a dynamic microphone and an output line. The amplifier produces a signal at the output having characteristics similar to those of a signal from a carbon microphone, i.e., noise is suppressed in the output line when no speech signal is present. The amplifier includes a main channel including two stages coupled through two arms of a T-pad. In the absence of a voice signaal from the microphone, the third arm of the T-pad is effectively grounded through a saturated transistor and thereby holds the main channel in a low gain condition. A signal integrator responds to the output of the first stage and integrates excursions of the voice signal above a predetermined level. As the integrated signal increases, it shifts the transistor gradually away from its saturated condition, thereby gradually increasing the gain of the main channel in response to initiation of a voice signal at the microphone. Similarly, the gain of the main channel is gradually decreased upon termination of a voice signal at the microphone. All parts of the amplifier circuit are energized from the output line.
REFERENCES:
patent: 3691311 (1972-09-01), Wilson
Popek Joseph A.
Roanwell Corporation
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