Publications – Details
Enhancement of Bandlimited Speech Signals
- Authors:
- Peter Jax and Peter Vary
- Book Title:
- Proceedings of Aachen Symposium on Signal Theory
- Venue:
- Aachen, Germany
- Date:
- Sept. 2001
- 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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