S. Hayashi and M. Suguimoto (Japan)
: Signal Processing, Speech Enhancement, Multi-resolution, Wavelet transformation
This paper describes a quality enhancement of band limited speech signals. In regular telephone communication, the quality of the received speech signal is degraded by band limitation. We propose an effective but a simple scheme for narrow band speech signals where the frequency components are to be estimated from their band limited signals. The method utilizes aliasing components in the inverse dis crete wavelet transform and filtering for spectrum shap ing. The results of enhancement have been verified by applying the method to diverse speeches via telephone lines to obtain great improvement in their speech quality.
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