Efficient alternatives to the Ephraim and Malah suppression rule for audio signal enhancement
Godsill, Simon John
EURASIP Journal on Applied Signal Processing
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Wolfe, P., & Godsill, S. J. (2003). Efficient alternatives to the Ephraim and Malah suppression rule for audio signal enhancement. EURASIP Journal on Applied Signal Processing, 10 (1), 1043-1051.
Audio signal enhancement often involves the application of a time-varying filter, or suppression rule, to the frequency-domain transform of a corrupted signal. Here we address suppression rules derived under a Gaussian model and interpret them as spectral estimators in a Bayesian statistical framework. With regard to the optimal spectral amplitude estimator of Ephraim and Malah, we show that under the same modelling assumptions, alternative methods of Bayesian estimation lead to much simpler suppression rules exhibiting similarly effective behaviour. We derive three of such rules and demonstrate that, in addition to permitting a more straightforward implementation, they yield a more intuitive interpretation of the Ephraim and Malah solution.
This record's URL: http://www.dspace.cam.ac.uk/handle/1810/240739
Rights Holder: et al.; licensee BioMed Central Ltd.