Super-Wideband Bandwidth Extension for Wideband Audio Codecs Using Switched Spectral Replication and Pitch Synthesis

Authors:

Geiser, B. ,  Krüger, H. ,  Vary, P.

Book Title:

Proceedings of German Annual Conference on Acoustics (DAGA)

Organization:

DEGA

Pages:

p.p. 663-664

Address:

Berlin, Germany

Date:

Mar. 2010

Language:

English

Abstract

This paper describes a new bandwidth extension algorithm which is targeted at high quality audio communication over IP networks. The algorithm is also part of the Huawei/ETRI candidate for the ITU-T superwideband (SWB) extensions of Rec. G.729.1 and G.718. In the codec, the 7-14 kHz frequency band of speech and audio signals is represented in terms of temporal and spectral envelopes. This description is encoded and transmitted to the decoder. In addition, the input signal's fine structure is analyzed and compactly encoded. From this compact information, the decoder can regenerate the 7-14 kHz fine structure either by spectral replication or by pitch synthesis. Then, an adaptive envelope restoration procedure is employed. The algorithm operates in the MDCT domain to allow subsequent refinement coding by vector quantization of spectral coefficients. In the paper, relevant listening test results for the G.729.1-SWB candidate codec that have been obtained during the ITU-T standardization process are summarized. Good audio quality could be shown for both speech and music signals.

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