Abstract
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. >
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