Soft mute circuit

Details Soft mute circuit Soft mute circuit

2005-08-16

2005-08-16

Tran, Sinh (Department: 2644)

Telephonic communications

Terminal

Having muting

C379S419000, C379S420010, C379S420020, C379S420030, C379S420040, C381S094500, C084S627000, C084S633000, C084S663000, C084S665000, C084S702000, C084S711000

Reexamination Certificate

active

06931124

ABSTRACT:
A soft mute circuit includes a programmable amplifier controlled by a register. Data is stored in the register from an adder that combines the current data in the register with a second number for increasing or decreasing the gain of the amplifier. A summation circuit includes a plurality of inputs coupled by gates to a summation node and the summation node is coupled to an input of the programmable amplifier. The gates are controlled by suitable logic for selecting input signals in any combination. A control loop maintains the gain of the amplifier at a predetermined level.

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