Control circuit for voltage controlled attenuator for speakerpho

Details Control circuit for voltage controlled attenuator for speakerpho Control circuit for voltage controlled attenuator for speakerpho

1993-06-17

1994-06-07

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379388, 379390, 379347, 330254, H04M 910, H04M 119, H03F 345

Patent

active

053197046

ABSTRACT:
An integrated control circuit for generating a regulated control voltage for voltage-controlled attenuators used in speakerphone circuits. The circuit provides separate transmit and receive voltage regulation to provide accurate gain settings for the voltage-controlled attenuators. The circuit eliminates the need for absolute value external components or external signal feedback between the voltage-controlled attenuators and the control circuit.

REFERENCES:
patent: 4490582 (1984-12-01), Munson
patent: 4720856 (1988-01-01), Pace et al.
patent: 4724540 (1988-02-01), Pace et al.
patent: 4944002 (1990-07-01), Bader

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