Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding
A bandwidth extension (BWE) algorithm from wideband to superwideband (SWB) is proposed for a scalable speech/audio codec that uses modified discrete cosine transform (MDCT) coefficients as spectral parameters. The superwideband is first split into several subbands that are represented as gain parame...
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Wiley
2013-01-01
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| Series: | Advances in Multimedia |
| Online Access: | http://dx.doi.org/10.1155/2013/909124 |
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| author | Young Han Lee Seung Ho Choi |
| author_facet | Young Han Lee Seung Ho Choi |
| author_sort | Young Han Lee |
| collection | DOAJ |
| description | A bandwidth extension (BWE) algorithm from wideband to superwideband (SWB) is proposed for a scalable speech/audio codec that uses modified discrete cosine transform (MDCT) coefficients as spectral parameters. The superwideband is first split into several subbands that are represented as gain parameters and normalized MDCT coefficients in the proposed BWE algorithm. We then estimate normalized MDCT coefficients of the wideband to be fetched for the superwideband and quantize the fetch indices. After that, we quantize gain parameters by using relative ratios between adjacent subbands. The proposed BWE algorithm is embedded into a standard superwideband codec, the SWB extension of G.729.1 Annex E, and its bitrate and quality are compared with those of the BWE algorithm already employed in the standard superwideband codec. It is shown from the comparison that the proposed BWE algorithm relatively reduces the bitrate by around 19% with better quality, compared to the BWE algorithm in the SWB extension of G.729.1 Annex E. |
| format | Article |
| id | doaj-art-6250465e0f944d69a2e5fa3e7b44de49 |
| institution | OA Journals |
| issn | 1687-5680 1687-5699 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Multimedia |
| spelling | doaj-art-6250465e0f944d69a2e5fa3e7b44de492025-08-20T02:35:12ZengWileyAdvances in Multimedia1687-56801687-56992013-01-01201310.1155/2013/909124909124Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio CodingYoung Han Lee0Seung Ho Choi1Speech Team, Future IT Convergence Laboratory, LG Advanced Research Institute, Seoul 137-724, Republic of KoreaDepartment of Electronic and IT Media Engineering, Seoul National University of Science and Technology, Seoul 139-743, Republic of KoreaA bandwidth extension (BWE) algorithm from wideband to superwideband (SWB) is proposed for a scalable speech/audio codec that uses modified discrete cosine transform (MDCT) coefficients as spectral parameters. The superwideband is first split into several subbands that are represented as gain parameters and normalized MDCT coefficients in the proposed BWE algorithm. We then estimate normalized MDCT coefficients of the wideband to be fetched for the superwideband and quantize the fetch indices. After that, we quantize gain parameters by using relative ratios between adjacent subbands. The proposed BWE algorithm is embedded into a standard superwideband codec, the SWB extension of G.729.1 Annex E, and its bitrate and quality are compared with those of the BWE algorithm already employed in the standard superwideband codec. It is shown from the comparison that the proposed BWE algorithm relatively reduces the bitrate by around 19% with better quality, compared to the BWE algorithm in the SWB extension of G.729.1 Annex E.http://dx.doi.org/10.1155/2013/909124 |
| spellingShingle | Young Han Lee Seung Ho Choi Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding Advances in Multimedia |
| title | Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding |
| title_full | Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding |
| title_fullStr | Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding |
| title_full_unstemmed | Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding |
| title_short | Superwideband Bandwidth Extension Using Normalized MDCT Coefficients for Scalable Speech and Audio Coding |
| title_sort | superwideband bandwidth extension using normalized mdct coefficients for scalable speech and audio coding |
| url | http://dx.doi.org/10.1155/2013/909124 |
| work_keys_str_mv | AT younghanlee superwidebandbandwidthextensionusingnormalizedmdctcoefficientsforscalablespeechandaudiocoding AT seunghochoi superwidebandbandwidthextensionusingnormalizedmdctcoefficientsforscalablespeechandaudiocoding |