Publications – Details
Robust Wideband Enhancement of Speech by Combined Coding and Artificial Bandwidth Extension
- Authors:
- Bernd Geiser, Peter Jax, and Peter Vary
- Book Title:
- Proceedings of International Workshop on Acoustic Echo and Noise Control (IWAENC)
- Venue:
- Eindhoven, The Netherlands
- Date:
- Sept. 2005
- Pages:
- 21–24
- Language:
- English
Abstract
Techniques for artificial bandwidth extension (BWE) of speech aim at the reconstruction of the complete wideband spectrum (i.e., an acoustic bandwidth of for instance 50 Hz - 7 kHz) from the knowledge of the narrowband speech signal, which is often limited in bandwidth by a “telephone bandpass” (300 Hz - 3.4 kHz). This (still blind) reconstruction can be achieved by the estimation of parameters
of a source model for speech production given the knowledge of the narrowband signal. The performance of this estimation can be shown to be theoretically bounded due to insufficient mutual information between the lower and the upper subbands (refer to [1] and [2]). Nevertheless, a significantly better wideband speech quality can be accomplished with the additional transmission of side information which can then be taken into account in the respective estimation rules. This leads to a new estimation scheme which tolerates side information transmission over channels of rather low capacity and is closely related to “softbit source decoding” [3].
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