In speech enhancement, the decision-directed (DD) approach to compute the a priori SNR is often used to reduce the musical tones. However, the constant DD weighting factor very close to one results in more speech distortion during transitional speech segments. Contrarily, a time-varying weighting factor gives less speech distortion but with more residual noise in speech pause. In this contribution we present a new a posteriori SNR computation to relax the dependence on the decision-directed weighting factor. By computing the a posteriori SNR with a time-varying weighting factor, we actually derive a correction factor to the time-varying DD weighting factor resulting in less speech distortion during transitions, as well as less residual noise in speech pause.
Cite as: Suhadi, S., Fingscheidt, T. (2007) Speech enhancement with improved a posteriori SNR computation. Proc. Interspeech 2007, 962-965, doi: 10.21437/Interspeech.2007-343
@inproceedings{suhadi07_interspeech,
author={Suhadi Suhadi and Tim Fingscheidt},
title={{Speech enhancement with improved a posteriori SNR computation}},
year=2007,
booktitle={Proc. Interspeech 2007},
pages={962--965},
doi={10.21437/Interspeech.2007-343}
}