Denoising by Time - Frequency Block Thresholding
نویسندگان
چکیده
Abstract— For audio denoising, diagonal thresholding estimators of spectrogram coefficients produce a “musical noise” that degrades audio perception. We introduce a block thresholding which produces hardly any musical noise and improves the SNR compared to diagonal thresholdings or Ephraim and Malah estimators. Spectrogram coefficients are grouped into blocks to compute attenuation factors. This block grouping regularizes the estimation which removes musical noises. The block size is adapted to the signal properties by minimizing a Stein unbiased estimator of the block thresholding risk.
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