Shape and scale parameters for extended-band frequency coding
US7953604B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2006 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Mar 21, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/038
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.