Patent ID: 8249862
Filing Date: 2012-08-21
Classification: G10L

Abstract:
1. An audio processing apparatus in a system, comprising: a signal generator outputting a first processed signal and a second processed signal, wherein the signal generator comprising: a beamformer receiving a plurality of input signals from a microphone array and processing the input signals to generate the first processed signal, wherein the input signals comprise at least one of a source signal and interference; a blocking matrix receiving the input signals and operating to cancel the source signal from the input signals to generate the second processed signal; a characteristic analyzer coupled to a first adaptive filter for analyzing characteristics of a plurality of first filter coefficients; and a controller coupled between the characteristic analyzer and a second adaptive filter and generating a control signal according to the characteristics of the first filter coefficients; the first adaptive filter coupled to the signal generator and having the first filter coefficients that are adaptable, wherein the first adaptive filter generates a first filtered signal according to the first and second processed signals and adapts the first filter coefficients according to the first filtered signal and the first processed signal; and the second adaptive filter coupled to the signal generator and having a plurality of second filter coefficients that are adaptable, wherein the second adaptive filter generates a second filtered signal approximating the interference according to the first and second processed signals and selectively adapts the second filter coefficients according to the first filter coefficients and an output signal generated according to the second filtered signal and the first processed signal, and wherein the second adaptive filter changes an adaptation step size of the second filter coefficients according to the control signal.