Modulation Spectrum in Speech Processing

Abstract

CiteSeerX - Document Details (Isaac Councill, Lee Giles): The work questions adequacy of the short-term spectral envelope as the dominant carrier of the phonetic identity of a given speech instant and suggests temporal dynamics of components of the spectral envelopes as more reliable means for carrying the linguistic context of the speech message. It summarizes some research which employs processing of the so called modulation spectrum of speech. In argues that dominant linguistic information bearing components of modulation spectrum are found in the vicinity of 4 Hz and demonstrates that suppressing slow and fast components of trajectories of spectral envelopes can be useful in alleviating effects of acoustic environment in processing of speech. 1.1 Short-Term Spectral Envelope in Speech Processing Spectral analysis of sufficiently short segment of speech signal yields a short-term spectrum of speech, each spectral vector describing about 10 ms of the speech signal. The short-term analysis dominates speech processing for more than half cent...