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An Information Theoretic View on Artificial Bandwidth Extension in Noisy Environments

Authors:

Thomas Esch and Peter Vary

Book Title:

Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

Venue:

Kyoto, Japan

Event Date:

25.-30.3.2012

Organization:

IEEE

Location:

Piscataway, NJ, USA

Date:

Mar. 2012

Pages:

4073–4076

Language:

English

Abstract

Artificial Bandwidth Extension (ABWE) exploits spectral dependencies of speech signals and aims at recovering missing high frequency components if only the narrowband speech signal is available. This contribution provides an information theoretic view on ABWE when used in noisy conditions. Based on the results of [1], a performance bound of ABWE is formulated if the narrowband signal is disturbed by additive noise. The performance bound is evaluated using real entropy measurements and the influence of noise suppression prior to ABWE is investigated.

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