Scalable superwideband extension for wideband coding

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...

Full description

Saved in:
Bibliographic Details
Main Authors: Tammi, M., Laaksonen, L., Ramo, A., Toukomaa, H.
Format: Conference Proceeding
Language:English
Subjects:
Audio coding
Bandwidth
Delay
Frequency
Scalability
Speech codecs
Speech coding
Standardization
Streaming media
superwideband extension
Wideband
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1520-6149
2379-190X
DOI:10.1109/ICASSP.2009.4959545