An analytical spectral formulation of glottal flow

The need for accurate voice source characterisation is an established goal in speech processing research. Practical limitations prohibit the widescale use of a glottal source/vocal tract filter implementation for many speech processing applications. In coding applications, for example, the transduction of the speech signal is with non-specialist microphones under diverse and often adverse conditions. In addition the transmission path and decoding process introduces further phase distortion. In the case of synthesis the accurate recording of a phase sensitive database is not overly problematic, however the extraction of the flow waveform from such a database is still a non-trivial task and as yet no automatic inverse filtering technique is readily available. One possible solution for overcoming the problem of extracting the timing events of the glottal flow is to implement a frequency domain representation and parameterization of the glottal flow waveform. An analytical spectral formulation of an existing time domain glottal model is presented.