Patent ID: 7953596
Filing Date: 2011-05-31
Classification: G10L

Abstract:
1. 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: 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.