Patent ID: 8620650
Filing Date: 2013-12-31
Classification: G10L,H04R

Abstract:
1. An apparatus for combining signals comprising: a first microphone generating a first input signal having a first voice component and a first noise component; a second microphone generating a second input signal having a second voice component and a second noise component; a mixing circuit configured to: an adaptive filter configured to compute an updated value of α to minimize the energy of the summed signal based on the summed signal, the first input signal and the second input signal, and to provide the updated value of α to the mixing circuit, wherein the adaptive filter is configured to apply a least-mean-squared algorithm to compute the updated value of α, and the adaptive filter is implemented in a digital signal processor programmed to compute a difference between the first and second signals, multiply the summed signal by the difference and by a pre-determined step size value, and subtract the product from the current value of α to produce the updated value of α.