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A Noise Reduction Preprocessor for Mobile Voice Communication
EURASIP Journal on Advances in Signal Processing volume 2004, Article number: 147306 (2004)
Abstract
We describe a speech enhancement algorithm which leads to significant quality and intelligibility improvements when used as a preprocessor to a low bit rate speech coder. This algorithm was developed in conjunction with the mixed excitation linear prediction (MELP) coder which, by itself, is highly susceptible to environmental noise. The paper presents novel as well as known speech and noise estimation techniques and combines them into a highly effective speech enhancement system. The algorithm is based on short-time spectral amplitude estimation, soft-decision gain modification, tracking of the a priori probability of speech absence, and minimum statistics noise power estimation. Special emphasis is placed on enhancing the performance of the preprocessor in nonstationary noise environments.
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Martin, R., Malah, D., Cox, R.V. et al. A Noise Reduction Preprocessor for Mobile Voice Communication. EURASIP J. Adv. Signal Process. 2004, 147306 (2004). https://doi.org/10.1155/S1110865704312138
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DOI: https://doi.org/10.1155/S1110865704312138
Keywords and phrases
- speech enhancement
- noise reduction
- speech coding
- spectral analysis-synthesis
- minimum statistics