Patent ID: 7953596

Claim:
In a data processing apparatus, a method of denoising an original noisy signal, said original noisy signal including a speech component and a noise component, the noise component comprising a transient noise component and a pseudo-steady noise component, the method comprising analyzing time coherence of the sampled noisy signal comprising the steps of: a) determining a reference signal by processing the original noisy signal by attenuating the speech components more strongly than the noise component, said processing comprising: a1) applying an adaptive linear prediction algorithm operating on a linear combination of a plurality of samples of the noisy signal, said samples of said noisy signals temporally taken prior to said original noisy signal, to produce a predictive signal; and a2) determining said reference signal by taking the difference, with compensation for phase offset, between the original noisy signal and the predictive signal delivered by the linear prediction algorithm; b) determining probability of speech being absent on the basis of the respective energy levels in the spectral domain of the original noisy signal and of the reference signal; and c) using said probability of the absence of speech to estimate a noise spectrum and deriving from the original noisy signal a denoised estimate of the speech signal; wherein the noisy signal is received by a single microphone.