| Paper: | SP-P1.8 | ||
| Session: | Speech Coding for Networks / Single-Channel Speech Enhancement | ||
| Time: | Tuesday, May 18, 13:00 - 15:00 | ||
| Presentation: | Poster | ||
| Topic: | Speech Processing: Speech Enhancement | ||
| Title: | ON THE DECISION-DIRECTED ESTIMATION APPROACH OF EPHRAIM AND MALAH | ||
| Authors: | Israel Cohen; Technion-Israel Institute of Technology | ||
| Abstract: | The decision-directed approach of Ephraim and Malah is widely used for a priori SNR estimation and speech enhancement. However, it conflicts with common model assumptions. In this paper, we propose consistent recursive estimators for the a priori SNR and the speech spectral components. We introduce a novel statistical model that takes into account the time-correlation between successive speech spectral components, while keeping the resulting algorithms simple. This model provides new insight into the decision-directed approach, and enables the extension of existing speech enhancement algorithms to noncausal estimation. The causal a priori SNR estimator degenerates, as a special case, to a ''decision-directed'' estimator with a \emph{time-varying} weighting factor. The noncausal estimator is capable of discriminating between speech onsets and noise irregularities, achieving lower levels of both musical noise and speech distortion. | ||
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