Portable voice communication system

Details Portable voice communication system Portable voice communication system

Filed on

1979-05-21

Date issued

1982-01-19

Examiner

Konick, Bernard

Patent Class

Amplifiers

SubClass

Signal feedback

SubSubClass

Combined with control of bias voltage of signal amplifier

Other Related Categories

179 1A, 179179, 330294, H04R 144

Type

Patent

Status

active

Patent number

043118720

Description

ABSTRACT:
A throat microphone consists of a dynamic pressure transducer sealed within an airtight tympanic enclosure to be held by an elastic band on the user's throat near the voice box. The electrical signals generated by the transducer are applied as an input signal to an amplifier and speaker unit where the signal is conditioned by a preamplifier stage for further amplification by a second stage that contains a variable reactive negative feedback network that acts as a low pass filter and corrects the phase shift of the different lower frequency audio signal components while emphasizing the higher frequency components so that severe phase distortion of the signal applied to the drive speaker through an output power amplifier stage can be minimized to make the speech sounds reproduced more intelligible.

REFERENCES:
patent: 3382321 (1968-05-01), Lybarger et al.
patent: 3422225 (1969-01-01), Griese
patent: 3588359 (1971-06-01), Cribb
patent: 3732446 (1973-05-01), Bryant

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