Publications – Details
Wideband Extension of Telephone Speech Using a Hidden Markov Model
- Autoren:
- Peter Jax und Peter Vary
- Buchtitel:
- Proceedings of IEEE Workshop on Speech Coding (SCW)
- Veranstaltungsort:
- Delavan, Wisconsin, USA
- Veröffentlich.datum:
- Sep. 2000
- Sprache:
- Englisch
Kurzfassung
In this paper we propose an algorithm to recover wideband speech from lowpass-bandlimited 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, and minimizes a mean squared error criterion. The new algorithm needs only one single wideband codebook and inherently guarantees the transparency of the system in the base-band. The enhanced speech exhibits a significantly larger bandwidth than the input speech without introducing objectionable artifacts.
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