Method and apparatus for speech enhancement in a speech communication system

摘要

A speech communication system comprises a receiving unit 14 which receives speech data and uses that data to output speech 15. The characteristics of the received speech data are altered by a processing unit 10 to make the speech more intelligible by altering line spectral pair data representing the speech to alter the frequency of a component in the speech spectrum. For example, an automatic examination of background noise amplitudes around the frequency of a formant of the speech might reveal that shifting the formant frequency upwards or downwards by 10% may improve intelligibility. If this is likely (perhaps because the noise amplitude reduces at a frequency 10% lower than the formant frequency), then the processing unit shifts the appropriate line spectral pair data by the corresponding amount.