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Patent US7953604 - Shape and scale parameters for extended-band frequency coding - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn audio encoder performs frequency extension coding that comprises determining one or more shape parameters using a displacement vector that corresponds to a displacement of an even number (e.g., an even number of sub-bands between a sub-band in a baseband frequency range and a sub-band in an extended-band...http://www.google.com/patents/US7953604?utm_source=gb-gplus-sharePatent US7953604 - Shape and scale parameters for extended-band frequency codingAdvanced Patent SearchPublication numberUS7953604 B2Publication typeGrantApplication numberUS 11/336,618Publication dateMay 31, 2011Filing dateJan 20, 2006Priority dateJan 20, 2006Also published asUS20070174063Publication number11336618, 336618, US 7953604 B2, US 7953604B2, US-B2-7953604, US7953604 B2, US7953604B2InventorsSanjeev Mehrotra, Wei-ge Chen, Kazuhito Koishida, Chao HeOriginal AssigneeMicrosoft CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (116), Non-Patent Citations (107), Referenced by (9), Classifications (7), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetShape and scale parameters for extended-band frequency codingUS 7953604 B2Abstract An audio encoder performs frequency extension coding that comprises determining one or more shape parameters using a displacement vector that corresponds to a displacement of an even number (e.g., an even number of sub-bands between a sub-band in a baseband frequency range and a sub-band in an extended-band frequency range). The shape parameters can be determined on a per-audio-block basis. Restricting a displacement to an even number (in frequency extension coding or in other signal modulation schemes) can improve the quality of reconstructed audio. An audio encoder also can perform frequency extension coding that comprises determining one or more scale parameters at one or more audio blocks, and determining one or more anchor points for interpolating the one or more scale parameters.
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