Artificial Bandwidth Extension of Speech Supported by Watermark-Transmitted Side Information

Authors:

Geiser, B. ,  Jax, P. ,  Vary, P.

Book Title:

Proceedings of European Conference on Speech Communication and Technology (INTERSPEECH)

Pages:

p.p. 1497-1500

Address:

Lisbon, Portugal

Date:

Sep. 2005

Language:

English

Abstract

In recent years research the area of artificial bandwidth extension (BWE) of speech signals has made significant progress. The intention of BWE is to produce wideband speech with a cut-off frequency of for instance 7 kHz from a narrowband version (e.g., with telephone bandwidth, i.e., 300Hz − 3.4 kHz). The respective algorithms are based on the estimation of parameters of a source model for speech production given the knowledge of the narrowband signal. A theoretical performance bound on this estimation has been formulated in [1]. In order to overcome this boundary we propose the transmission of (compact) side information which can support the parameter estimation. Since a common additional channel would conflict with the requirement of backwards compatibility in narrowband communication systems, the side information is embedded as digital watermark into the narrowband speech.

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