Method and system for detection of onset of near-end signal in an echo cancellation system

摘要

A method, a system and a computer program product for fast detection of the onset of a near-end signal is provided. An Acoustic Echo Canceller (AEC) attenuates an acoustic echo present in a tele-communication network. The AEC includes an adaptive filter that estimates the acoustic echo and generates an error signal. The error signal is the difference between the acoustic echo and the estimate of acoustic echo plus a near-end signal, if present. The method comprises computing an onset indicator parameter from the error signal and the estimate of acoustic echo. Several other parameters are subsequently calculated by using the onset indicator parameter, the error signal and the estimate of acoustic echo.

主权项

1. A method for use in Acoustic Echo Cancellation comprising:
indicating onset of a near end speech signal at a near end of a two-way communication channel, responsive to at least one of (1) detecting, at a near end, a time in which an angle between a microphone output signal and an estimate of acoustic echo present at the near end is greater than a first threshold, and (2) detecting that a average onset indicator parameter at time instant n is greater than an onset detection threshold parameter from a previous time instant, and that the average onset indicator parameter is greater than a second threshold, wherein the onset indicator parameter at a time instant n is computed from an error signal produced from the microphone output signal at time instant n, and the estimate of acoustic echo at the time instant n, and an average onset indicator parameter at time instant n is computed from the onset indicator parameter.