Communication system

Details Communication system Communication system

2008-02-20

2011-12-27

Jamal, Alexander (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Disable or inhibit function

Reexamination Certificate

active

08085930

ABSTRACT:
A method for removing an echo component in a first signal received at an audio input device, said method comprising the steps of outputting a second signal from an audio output device, receiving at the audio input device the first signal wherein the echo component in the first signal is the result of the second signal traversing an echo path having a frequency response which defines the relationship between the echo component and the second signal; determining an echo path model indicating an estimate of the frequency response of the echo path; removing an estimate of the echo component from the first signal using the echo path model; detecting if the first signal is overloaded; and wherein if it is detected that the first signal is overloaded the step of determining an echo path model comprises determining an overload echo path model such that the estimate of the frequency response indicated by the overload echo path model is only allowed to increase over time regardless of whether the frequency response of the echo path is decreasing over time.

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