Audio Denoising by Time-Frequency Block Thresholding |
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Authors: | Guoshen Yu Mallat S Bacry E |
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Affiliation: | Ecole Polytech., Palaiseau; |
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Abstract: | Removing noise from audio signals requires a nondiagonal processing of time-frequency coefficients to avoid producing ldquomusical noise.rdquo State of the art algorithms perform a parameterized filtering of spectrogram coefficients with empirically fixed parameters. A block thresholding estimation procedure is introduced, which adjusts all parameters adaptively to signal property by minimizing a Stein estimation of the risk. Numerical experiments demonstrate the performance and robustness of this procedure through objective and subjective evaluations. |
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