Artificial Bandwidth Extension of Wideband Speech by Pitch-Scaling of Higher Frequencies

Authors:

Geiser, B. ,  Vary, P.

Editors:

Horbach, M.

Book Title:

Workshop Audiosignal- und Sprachverarbeitung (WASP)

Organization:

Gesellschaft für Informatik e.V. (GI)

Series:

Lecture Notes in Informatics (LNI)

Volume:

220

Pages:

p.p. 2892-2901

Date:

Sep. 2013

Note:

Workshop im Rahmen der 43. Jahrestagung der Gesellschaft für Informatik

ISBN:

978-3-88579-614-5

ISSN:

1617-5468

Language:

English

Abstract

In this paper, a simple DFT-domain pitch-scaling technique is used to extend the audio bandwidth of wideband speech (50 Hz - 7 kHz) to the super-wideband range (50 Hz - 12 kHz). Therefore, the higher frequencies of the wideband signal (6 - 7 kHz) are pitch-scaled with a scaling factor of four and the resulting, scaled signal is inserted into the 8 - 12 kHz band. A subjective listening test has been conducted wherein it could be shown that the new proposal clearly outperforms a previous method for artificial bandwidth extension which is based on statistical estimation techniques.

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