Modulation Spectral Transforms -Application to Speech Separation and Modification-
Les Atlas · 聴覚研究会資料 = Proceedings of the auditory research meeting · 2003
Recent auditory physiological evidence points to a frequency dimension in the auditory cortex. This dimension exists jointly with the tonotopic acoustic frequency dimension. Thus, audition can be considered as a relatively slowly-varying two-dimensional representation, the modulation spectrum, where the first dimension is the well-known acoustic frequency and the second dimension is frequency. We have recently developed a fully invertible analysis/synthesis approach for this spectral transform. A general application of this approach is removal or modification of different frequencies in audio or speech signals, which, for example, causes major changes in perceived dynamic character. A specific application of this modification is single-channel multiple-talker separation. Keyword Digital Signal Processing , Speech Processing , Modulation Spectrum , Audio Coding