Spectral correlates of glottal waveform models: an analytic study

This paper deals with spectral representation of the glottal ow. The LF and the KLGLOTT88 models of the glottal ow are studied. In a rst part, we compute analytically the spectrum of the LF-model. Then, formulas are given for computing spectral tilt and amplitudes of the rst harmonics as functions of the LF-model parameters. In a second part we consider the spectrum of the KLGLOTT88 model. It is shown that this model can be modeled in the spectral domain by an all-pole third-order linear lter. Moreover, the anticausal impulse response of this lter is a good approximation of the glottal ow model. Parameter estimation seems easier in the spectral domain. Therefore our results can be used for modi cation of the (hidden) glottal ow characteristic of natural speech signals, by processing directly the spectrum, without needing time-domain parameter estimation.