Estimation of amplitude features of the glottal flow by inverse filtering speech pressure signals

In this study a new scaling technique is presented which makes it possible to estimate the voice source including its amplitude values by inverse filtering the speech pressure waveform without applying a flow mask. The new technique is based on adjusting the DC-gain of the vocal tract model in inverse filtering to unity. The performance of the new method is tested by analysing correlation between the minimum peak amplitude of the differentiated glottal flow given by the new technique and the sound pressure level of speech. The results show that the new method yields reliable information of the amplitude values of the glottal source without applying a flow mask. (C) 1998 Elsevier Science B.V. All rights reserved.