Two terminal microphone active load gain regulation circuit

Details Two terminal microphone active load gain regulation circuit Two terminal microphone active load gain regulation circuit

1984-04-02

1985-05-21

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

179 16F, 381113, H04M 160

Patent

active

045188297

ABSTRACT:
An electret microphone gain regulation circuit employing an active load for use in high quality telephone instruments or handsets where two terminal electret microphones of the current source type are employed. The circuitry provides a heavier load on short loops and a lighter load on long loops to regulate the signal level at its output.

REFERENCES:
patent: 3748400 (1973-07-01), Ritz et al.
patent: 4394542 (1983-07-01), Hara et al.

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