Liljencrants-Fant model

The Liljencrants-Fant model (brief: LF model)is a voice source model. It has four parameters to give a parametric representation of glottal flow. Inverse filtering is used to remove the filtering influences of the vocal tract such that the original source sound is recovered. One of the LF parameters corresponds to the overall amplitude of the source, while the three other parameters concern the spectral content of the pulse.

Link
Utrecht Lexicon of Linguistics