ECE 797: Speech and Audio Processing - McMaster …ibruce/courses/ECE797_lecture8.pdfx[n] O ©1989, Figure 6.3 Canonical formulation of a homomorphic system. SOURCE: A. V. Oppenheim

ECE 797:Speech and Audio

ProcessingHand-out for Lecture #8

Thursday, March 11, 2004

Distorts convolutionalmodel

Distortion from values outside the window

Effects of windowing

Length of lifterNumber of polesModel order

Aliasing problemsAliasing problemsEffects of pitch

“Natural” but “muffled”

“Crisper” but more “mechanical”

Speech synthesis

Mixed-phaseMinimum-phasePhase properties

Pole-zero modelAll-pole modelRational function representation

Wider, spurious resonances

Sharp, smooth resonances

Parametric vsnon-parametric

Homomorphic Filtering

Linear Prediction