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Speech Bandwidth Extension Based on In-Band Transmission of Higher Frequencies

Authors:

Bernd Geiser and Peter Vary

Book Title:

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

Venue:

Vancouver, BC, Canada

Event Date:

26.-31.5.2013

Organization:

IEEE

Location:

Piscataway, NJ, USA

Date:

May 2013

Language:

English

Abstract

A new method for wideband speech transmission is proposed which is fully backwards compatible with narrowband telephone systems. For this purpose, a pitch-scaled version of the higher speech frequencies (4-6.4 kHz) is inserted into the previously "unused" 3.4-4 kHz frequency range of standard telephone speech. This operation is reverted at the decoder side. A consistently good wideband speech quality can be achieved, even after transmission over common codecs and codec tandems. The quality impact on the narrowband part of the signal is insignificant.

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