Publications-Detail

Enhancement of Band-Limited Speech Signals

Authors:
Jax, P.Vary, P.
Book Title:
Proceedings of International ITG Conference on Source and Channel Coding (SCC)
Pages:
p.p. 347-352
Address:
Berlin, Germany
Date:
Jan. 2002
Language:
English

Abstract

In this contribution we present an algorithm to produce wideband speech from bandlimited "telephone speech". The narrowband input signal is classified into a limited number of speech sounds for which the information about the wideband spectral envelope is taken from a pre-trained codebook. For the codebook search algorithm a statistical approach based on a hidden Markov model is used, which takes different features of the bandlimited speech into account. Several estimators are presented which take various amounts of a priori knowledge into consideration. The algorithmic approach inherently guarantees the transparency of the system in the base-band. The enhanced speech exhibits a significantly larger quality and transparency than the input speech without introducing objectionable artifacts.

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