Line spectral frequencies are poles and zeros of the glottal driving- point impedance of a discrete matched-impedance vocal tract model

This correspondence demonstrates that the line spectral frequencies (LSFs) are the pole and zero frequencies of the glottal driving-point impedance of a discrete matched-impedance vocal-tract model. Several well- known characteristics of the LSFs, including the interlacing of pole and zero frequencies, are shown to follow naturally from this proof. (C) 2000 Acoustical Society of America.