Audio agc amplifier

Details Audio agc amplifier Audio agc amplifier

H - Electricity

04

R

179/41

H04R 3/00 (2006.01) H03G 3/30 (2006.01)

Patent

CA 1045044

TITLE AUDIO AGC AMPLIFIER ABSTRACT An automatic gain control circuit for limiting the acoustical power to the receiver portion of a telephone opera- tor's headset. The circuit provides means whereby the maximum level of acoustic energy output a telephone operator is sub- jected to is controlled to levels well below those where damage to the ear can occur. Features of the invention include the use of diodes in the feedback path of the amplifier whereby DC currents control the conductivity of the diodes to control the amplifier gain, and a pair of such circuits in phase op- position serve to cancel control current effects on the signal path.

254606

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