AUDIO SIGNAL NOISE ATTENUATION

摘要

A noise attenuation apparatus receives an audio signal comprising a desired and a noise signal component. Two codebooks (109, 111) comprise respectively desired signal candidates representing a possible desired signal component and noise signal contribution candidates representing possible noise contributions. A segmenter (103) segments the audio signal into time segments and for each time segment a noise attenuator (105) generates estimated signal candidates by for each of the desired signal candidates generating an estimated signal candidate as a combination of a scaled version of the desired signal candidate and a weighted combination of the noise signal contribution candidates. The noise attenuator (105) minimizes a cost function indicative of a difference between the estimated signal candidate and the audio signal in the time segment. A signal candidate is then determined for the time segment from the estimated signal candidates and the audio signal is noise compensated based on this signal candidate.

主权项

1. A noise attenuation apparatus comprising:
a receiver for receiving an audio signal comprising a desired signal component and a noise signal component; a first codebook comprising a plurality of desired signal candidates for the desired signal component, each desired signal candidate representing a possible desired signal component; a second codebook comprising a plurality of noise signal contribution candidates, each noise signal contribution candidate representing a possible noise contribution for the noise signal component; a segmenter for segmenting the audio signal into time segments; and a noise attenuator configured to, for each time segment:
generate a plurality of estimated signal candidates by for each of the desired signal candidates of the first codebook generating an estimated signal candidate as a combination of a scaled version of the desired signal candidate and a weighted combination of the noise signal contribution candidates, the scaling of the desired signal candidate and weights of the weighted combination being determined to minimize a cost function indicative of a difference between the estimated signal candidate and the audio signal in the time segment,generate a signal candidate for the audio signal in the time segment from the estimated signal candidates, andattenuate noise of the audio signal in the time segment in response to the signal candidate.