Patent ID: 9510096
Filing Date: 2016-11-29
CPC Classification: H04R

Claim Text:
1. A method for cancelling or reducing noise/interference component signal in speech signal enhancement processing, the method comprising: estimating the noise/interference component signal by subtracting a voice component signal from a first microphone input signal wherein the voice component signal is evaluated as a first replica signal produced by passing a second microphone input signal through a first adaptive filter; adjusting energy variation of the noise/interference component signal based on noise stability of a target signal which comes from the first microphone input signal or the second microphone input signal, wherein the target signal contains voice area having voice component signal and noise/interference area having only noise/interference component signal, and the energy of the noise/interference component signal is reduced or smoothed in the voice area if the target signal is detected containing stable (slowly changed) background noise; outputting a noise/interference reduced signal by subtracting a second replica signal from the target signal, wherein the second replica signal is produced by passing the adjusted noise/interference component signal through a second adaptive filter.