Patent ID: 8364479

Claim:
A method for providing an estimate of a spectral noise power density of an audio signal, comprising: providing a first estimate of the spectral noise power density of the audio signal {tilde over (S)} bb ; determining a time dependent correction term based, at least in part, on a spectral noise power density estimation error of the spectral noise power density E n ; summing the first estimate {tilde over (S)} bb and the correction term to obtain a second estimate of the spectral noise power density of the audio signal Ŝ bb ; where the correction term is determined so that the spectral noise power density estimation error E n is reduced, and where E n is determined by at least one of E n =S bb −{tilde over (S)} bb and E n =S bb −Ŝ bb ,where S bb corresponds to the spectral noise power density of the audio signal, where the audio signal comprises a wanted signal component and a noise component, and where the correction term is based on: an expectation value of the squared difference of the spectral noise power density and the first estimate of the spectral noise power density of the audio signal Ŝ bb , and an expectation value of the squared spectral power density of the wanted signal component.