Publications-Detail

Acoustic Tube Interpolation for Spectral Envelope Estimation in Artificial Bandwidth Extension

Authors:
Schlien, T.Jax, P.Vary, P.
Book Title:
ITG-Fachtagung Sprachkommunikation
Organization:
VDE
Publisher:
VDE Verlag GmbH
Date:
Oct. 2018
ISBN:
978-3-80074-767-2
Language:
English

Abstract

For historical reasons, today’s telephony frequencies are mostly
still restricted to a narrowband of 3.4 kHz. Meanwhile wideband
speech coding, also called HD voice, with a bandwidth of 7 kHz,
is increasingly on the move into the networks and terminals.

In the transition phase quite often a wideband terminal is receiving a narrowband signal. In order to achieve speech quality
as close as possible to HD voice, artificial bandwidth extension
(ABWE) has been developed as add-on for wideband equipment.
State-of-the-art ABWE algorithms estimate and reconstruct missing frequency components with the help of the source-filter model
of speech production.

In this paper, a new method for estimating the model filter is
presented, which is based on geometrical interpolation of the well
known acoustical lossless tube model of speech production. Objective evaluation and subjective listening tests prove similar or even
better quality compared to traditional more complex approaches.

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