On the Representation of Voice Source Aperiodicities in the MBE Speech Coding Model
Preeti Rao, Pushkar G. Patwardhan · 2003
We present an investigation of the representation of voice source aperiodicities in the Multi-Band Excitation (MBE) speech model for the compression of narrowband speech. The MBE model is a fixed-frame based analysis-synthesis algorithm which combines harmonic and stochastic com-ponents to reconstruct speech from estimated model pa-rameters. Pitch cycle perturbations, such as jitter and shimmer, are not captured accurately in the framewise constant parameter estimates, thus impacting the repro-duced voice quality. The actual dependence of MBE re-constructed voice quality on the voice pitch and the type of perturbation are explored through objective measure-ments and subjective listening with synthetic and natural speech. 1.