INTERSPEECH 2013

This paper addresses the sourcefilter separation problem in the context of causal/anticausal linear filter model of voice production. An algorithm based on standard signal processing tools is proposed for the class of quasiperiodic signals (voiced sounds with quasistationary pitch). At first, a oneperiod frame of an equivalent stationary infinitely periodic signal is built. A particular attention is given to the problems of windowing and temporal aliasing. Secondly, an exact pole decomposition of this signal is computed within the class of T_{0}periodic signals. Finally, the glottal closure instant (GCI) and the causalanticausal factorization of the initial frame are jointly estimated from the latter decomposition. The performance of this algorithm on synthetic signals is demonstrated and the performance on real speech is discussed. In conclusion, application of this new algorithm in a complete voice analysissynthesis system is discussed.
Bibliographic reference. Hézard, Thomas / Hélie, Thomas / Doval, Boris (2013): "A sourcefilter separation algorithm for voiced sounds based on an exact anticausal/causal pole decomposition for the class of periodic signals", In INTERSPEECH2013, 5458.