Scalable superwideband extension for wideband coding

Authors:
Mikko Tammi;Lasse Laaksonen;Anssi Ramo;Henri Toukomaa
Affiliations:
Nokia Research Center, Tampere, Finland;Nokia Research Center, Tampere, Finland;Nokia Research Center, Tampere, Finland;Nokia Research Center, Tampere, Finland
Venue:
ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
Year:
2009

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Abstract

Recent trends in speech and audio codec standardization include scalability and extending the signal bandwidth beyond wideband (WB) to superwideband (SWB). In this paper we introduce a SWB extension for the ITU-T G.718 WB codec. In the SWB extension the high frequency content is generated utilizing the quantized MDCT domain coefficients of the WB core, which enables low additional delay. The proposed implementation is scalable with 4 kbps layers. In the first layer two different coding modes are used depending on the input signal type. The proposed SWB extension is evaluated with listening tests and complexity analysis.