EFFECTS OF BANDWIDTH ON GLOTTAL AIR-FLOW WAVE-FORMS ESTIMATED BY INVERSE FILTERING - COMMENTS

In the subject paper [Alku and Vilkman, J. Acoust. Sec. Am. 98, 763-76 7 (1995); hence AV], AV describe the results of their research on the effect of bandwidth on estimated voice source parameters. They found t hat reducing the bandwidth (by low-pass filtering the glottal flow sig nals) leads to a distortion of the estimated parameters. Although I do agree that low-pass filtering influences the estimate of the voice so urce parameters, I do not agree with some of their conclusions, explan ations, and recommendations. Furthermore, the method they used does no t seem to be optimal for the purpose of their research. These matters are discussed in this Letter. (C) 1996 Acoustical Society of America.