Adaptive time segmentation for improved speech enhancement

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Single-channel enhancement algorithms are widely used to overcome the degradation of noisy speech signals. Speech enhancement gain functions are typically computed from two quantities, namely, an estimate of the noise power spectrum and of the noisy speech power spectrum. The variance of these power spectral estimates degrades the quality of the enhanced signal and smoothing techniques are, therefore, often used to decrease the variance. In this paper, we present a method to determine the noisy speech power spectrum based on an adaptive time segmentation. More specifically, the proposed algorithm determines for each noisy frame which of the surrounding frames should contribute to the corresponding noisy power spectral estimate. Further, we demonstrate the potential of our adaptive segmentation in both maximum likelihood and decision direction-based speech enhancement methods by making a better estimate of the a priori signal-to-noise ratio (SNR)$xi$. Objective and subjective experiments show that an adaptive time segmentation leads to significant performance improvements in comparison to the conventionally used fixed segmentations, particularly in transitional regions, where we observe local SNR improvements in the order of 5 dB.
Original languageUndefined/Unknown
Pages (from-to)2064-2074
Number of pages11
JournalIEEE Transactions on Audio, Speech and Language Processing
Issue number6
Publication statusPublished - 2006

Bibliographical note

volgens mij heette dit journal eerst IEEE.... on speech and audio proc..... en daarvan was de weegfactor 0,96, die heb ik dus maar aangehouden want voor dit journal staat "onbekend"


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