The source filter concept in voice production

This is a review of recent work on source-filter composition of voiced sounds, describing various alternatives of defining a source function w i t h implications for a m r e profound understandinq of the acoustic processes involved an8 their mdelling in equivalent netmrks. The theoretical study is backed up by experiments with inverse fi l tering and other types of glottq-dphy. Special attention is devoted t o time-varying bandwidths within a glottal 01x33 period and the implications for defining overall effective bandwidths. The presence in the speech wave of voice source comrmnents as well as the presence of formant oscillati.on in the glottal flow are discussed. Expressions for supraand suhglottal pressure fluctuations are also derived. An earlier propsea parametric model of glottal flow and f o m t excitation is reviewed and discussed with rcspect to voice intensity and some dynamic factor in connected speech.