Audio decoding apparatus and decoding method and program
US7941319B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 26, 2009 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Aug 30, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/032
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An energy corrector (105) for correcting a target energy for high-frequency components and a corrective coefficient calculator (106) for calculating an energy corrective coefficient from low-frequency subband signals are newly provided. These processors perform a process for correcting a target energy that is required when a band expanding process is performed on a real number only. Thus, a real subband combining filter and a real band expander which require a smaller amount of calculations can be used instead of a complex subband combining filter and a complex band expander, while maintaining a high sound-quality level, and the required amount of calculations and the apparatus scale can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.