Exploration of bit reoptimization schemes in transform-based speech coding

Abstract

Transform-based speech coding is an attractive alternative to conventional (i.e. linear-predictive) speech coding schemes due to its simplicity and its flexibility with respect to particular frequency components. The classic transform-based speech coding algorithm gives a well-defined coding procedure which yields good results. However its optimal bit assignment procedure has a good degree of variability. In this work several bit reoptimization schemes are explored, and a reoptimization scheme is proposed that is proven by simulations to be beneficial.