Patent ID: 6978009

Claim:
A speakerphone, comprising: a base unit; and a portable handset communicatively coupled to the base unit via a wireless channel, including a microphone; a speaker; a first speech path to the speaker; a second speech path to the microphone; a first programmable digital level-adjustor adapted to be controlled to provide a gain adjustment along the first speech path; a second programmable digital level-adjustor adapted to be controlled to provide a gain adjustment along the second speech path; a logic decision circuit, coupled to the first and second programmable digital level-adjustors, adapted to alternately receive speech signals in the respective speech paths and determine regularly the respective peak amplitudes of signals in the first and second speech paths, and, in response, controlling the gains of the respective first and second speech paths during full duplex operation by controlling the first and second programmable digital level-adjustors and is further adapted to operate in a plurality of full duplex substates, each substate defining a different relationship between respective gains of the first and second speech paths.