Method and system for noise reduction

摘要

The method involves converting noisy acoustic signal in time domain into noisy signal in frequency domain, and estimating a noise component in the signal from a square modulus by a minima controlled recursive averaging algorithm. Frequential band is cut into frequential subbands based on mutiband decomposition of the modulus and the component. A square modulus of a noiseless component of each subband is estimated. Noiseless output signal is determined from the estimated modulus using a determination module (36). The noiseless signal is converted into noiseless voice signal in time domain. The conversion of the noiseless signal is carried out by computing sampled output signal for time frames by applying inverse Fourier transform of the noiseless output signal and performing temporal reconstruction of noiseless output voice signal from the sampled signal. An independent claim is also included for a system for reducing noise in noisy acoustic signal obtained from a microphone operating in noisy environment.