Publications-Detail

On Artificial Bandwidth Extension of Telephone Speech

Authors:
Jax, P.Vary, P.
Journal:
(SIGPRO)
Volume:
83
Page(s):
1707-1719
number:
8
Date:
Aug. 2003
Language:
English

Abstract

We present a signal processing algorithm to convert speech signals with “standard telephone” quality into 7 kHz wideband speech. A statistical approach based on a hidden Markov model (HMM) is used, which takes into account several features of the band-limited speech. The narrowband input signal is classified into a limited number of speech sounds (HMM states) for which the wideband spectral envelope is estimated using the pre-trained model. The enhanced speech exhibits a signicantly improved quality without objectionable artifacts.

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