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Abstract

An echo canceler and method for a communications system include an echo-containing signal input for receiving a signal and an echo-causing signal source for developing an echo-causing signal. A first filter coupled to the echo-containing signal input and the echo-causing signal source filters the echo-containing signal over a predetermined time period using an existing filter coefficient set to provide a first echo-canceled output signal at a first filter output mode. A trial filter is coupled to the echo-containing signal input and the echo-causing signal source for processing the echo-containing signal over a predetermined time period using a trial filter coefficient set to provide a trial echo-cancel output signal at the trial filter output mode. A controller coupled to the echo-containing signal input, the echo-causing signal source, the first filter output mode, and the trial filter output mode periodically recalculates the trial coefficient set, calculates a first energy value of the echo-canceled output signal over the predetermined time period, calculates a trial energy value of the trial echo-canceled output signal over the predetermined time period and determines if the echo-containing signal is dominated by echo. The existing filter coefficient set is updated with the trial coefficient set where the echo-containing signal is dominated by echo and the trial energy is less than the first energy.

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First Claim