Microphone assembly for speech recording using noise-adaptive ou

Details Microphone assembly for speech recording using noise-adaptive ou Microphone assembly for speech recording using noise-adaptive ou

1979-06-21

1981-09-01

Smith, Jerry

179 1VL, H04R 2700

Patent

active

042873916

ABSTRACT:
A microphone which uses noise-adaptive automatic output level control in speech recording. An input amplifier cooperates with a voltage doubler to form an automatic gain control. A diode and capacitor circuit provides for envelope detection of the signal which is then differentiated, amplified and detected to result in a DC control signal. This control signal is applied to an output amplifier which functions as a three pole Chebyshev filter in which a reduction of gain dampens one pole of the filter causing the response to drop off, so that the signal appearing at the output of the microphone has a substantially high speech-to-noise ratio. The output signal appears at a constant level where it may then be acted upon by the automatic gain control of an associated tape recorder connected to the microphone.

REFERENCES:
patent: 3538253 (1970-11-01), Braun
patent: 3803357 (1974-04-01), Sacks
patent: 4025721 (1977-05-01), Graupe et al.
patent: 4207543 (1980-06-01), Izakson et al.

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