Compressor and expander circuits for compander system

Details Compressor and expander circuits for compander system Compressor and expander circuits for compander system

1975-06-20

1976-06-22

Gensler, Paul L.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

328171, 330 30D, 330136, 330145, 333 14, H03G 706

Patent

active

039654362

ABSTRACT:
The compressor part of a compander uses a differential amplifier to receive voice signals. Diode attenuator circuits are connected to the differential amplifier output and attenuate the differential amplifier output signals as a function of a rectified signal derived from the compressor output. The expander part of the compander also uses a differential amplifier to receive voice signals. The differential amplifier is interconnected by a diode attenuator circuit which varies the gain of the differential amplifier as a function of a rectified signal derived from the expander input. The compander thus requires no inductors and uses components which are relatively small and compact.

REFERENCES:
patent: 3303428 (1967-02-01), Zentmaier et al.
patent: 3435359 (1969-03-01), Sennhenn
patent: 3497823 (1970-02-01), Kriss et al.
patent: 3624491 (1971-11-01), Fidi et al.
patent: 3731215 (1973-05-01), Peil et al.
patent: 3757254 (1973-09-01), Takahashi et al.
patent: 3805177 (1974-04-01), Risley

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