Patent ID: 7831035
Filing Date: 2010-11-09
Classification: H04M

Abstract:
1. A method of digital signal processing at a near end of a two-way communication system for reducing echo for a remote end, the near end having a speaker for playing audio from the remote end and an array of microphones to capture near end speech, the method comprising: separately applying an acoustic echo cancellation process for canceling remote-end echo on each of a plurality of microphone channels from the microphone array; performing sound source localization and microphone array processing on the microphone channels to produce a source-localized speech channel for transmission to the remote end; performing center clipping on the source-localized speech channel, and wherein the center clipping comprises: if not, then passing the residual value for the frequency band on the source-localized speech channel unchanged, wherein said combining the leak through estimates comprises selecting a maximum of the leak through estimates of the microphone channels at the frequency band.