Patent ID: 9589572
Date: 2017-03-07
CPC Classifications: G10L

Claim:
1. A method for cancelling or reducing noise or interference component signal in speech signal enhancement processing, the method comprising: estimating the noise or interference component signal by subtracting voice component signal in an input signal from a first microphone of a cellular or mobile telephone wherein the voice component signal is evaluated as a replica voice component signal produced by passing another input signal from a second microphone of the cellular or mobile telephone through an adaptive filter; estimating a stepsize which controls adaptive update of the adaptive filter, wherein the stepsize, 0≦stepsize≦1, controls the update amount at each time index, and the stepsize is evaluated by combining an open-loop approach and a closed-loop approach, wherein the open-loop approach comprises using voice/noise/interference classification and SNR estimation in voice area, and the closed-loop approach comprises using a normalized correlation between the replica voice component signal and the input signal from the first microphone, wherein the combining of the open-loop approach and the closed-loop approach comprising generating an initial stepsize estimation for controlling the adaptive filter with the open-loop approach and limiting the estimated stepsize for controlling the adaptive filter with the closed-loop approach; obtaining a noise or interference reduced speech signal, which is from a target signal of the first microphone or the second microphone, by using the estimated noise or interference component signal; outputting the noise or interference reduced signal to a speech encoder of the cellular or mobile telephone for telecommunication application.