JOINT SOLUTIONS FOR FORMANT AND PITCH PREDICTORS IN SPEECH PROCESSING.

Jointly optimized solutions for formant and pitch predictors are discussed. The filters are implemented in transversal form with the formant filter always preceding the pitch (F-P cascade). The jointly optimized methods are further subdivided into a combined solution and an iterative sequential solution. Both yield higher prediction gains than their conventional sequentially determined counterpart. A practical version of the iterated sequential approach, in which the filters are constrained to be minimum phase, generates decoded speech of high perceptual quality when applied in a coding environment.