Patent ID: 8107642
Filing Date: 2012-01-31
Classification: G10L

Abstract:
1. A noise reduction system comprising: a microphone array comprising a first microphone, a second microphone, and a third microphone, wherein each microphone has a known position and a known directivity pattern; an instantaneous direction-of-arrival (IDOA) module that determines a first phase difference quantity and a second phase difference quantity, wherein the first phase difference quantity is based on phase differences between non-repetitive pairs of input signals received by the first microphone and the second microphone, and wherein the second phase difference quantity is based on phase differences between non-repetitive pairs of input signals received by the first microphone and the third microphone; and a spatial noise reduction module that computes an estimate of a desired signal based on an a priori spatial signal-to-noise ratio and an a posteriori spatial signal-to-noise ratio, wherein the a priori spatial signal-to-noise ratio and the a posteriori signal-to-noise ratio are each based on the first and second phase difference quantities.