| 摘要 |
Such methods are indispensable to ensure natural voice transmission from noisy environments, such as airports or sports arenas, by means of mobile or fixed communications terminals. Noise reduction is also necessary in voice-controlled apparatus to improve the quality of voice recognition. Using a Wiener filter in the well-known spectral subtraction method for noise reduction as well as a compressor and an expander, the dynamic range of the spectral subtraction is extended considerably. By nonlinear control of the overestimation factor and the noise floor of the transfer function of the Wiener filter, in comparison with the known prior art, a qualitative improvement in speech intelligibility is achieved for widely different ratios of speech to noise.
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