Method and system for automatic gain control with adaptive...

Details Method and system for automatic gain control with adaptive... Method and system for automatic gain control with adaptive...

2005-10-25

2005-10-25

Harold, Jefferey (Department: 2644)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S390010, C379S390030

Reexamination Certificate

active

06959082

ABSTRACT:
A method and system for automatic gain control is provided. The automatic gain control may be used, for example, with a microphone and voice codec of a speakerphone telephone. In an exemplary embodiment, an amplification gain lookup table stores the gain values. The power of the input signal is estimated and the appropriate gain value is selected as a function of the estimated power of the input signal. The gain value is applied to the input signal to provide an automatic gain controlled output signal. In another embodiment, the gain lookup table may be adapted to compensate for the non-linearity of the microphone and voice codec of the speakerphone. In this alternate embodiment, the output power of the automatic gain controlled signal is estimated and compared to a reference signal to generate an error signal. The error signal may be scaled and used to update and dynamically adapt the gain values in the gain lookup table.

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patent: 5617060 (1997-04-01), Wilson et al.
patent: 5666384 (1997-09-01), Kuban et al.

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