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.
Hasegawa-Johnson
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D006801:Humans; D007830:Larynx / Q000502:physiology*; D010700:Phonetics; D013060:Speech / Q000502:physiology*; D013068:Speech Production Measurement