Encoding apparatus and encoding method
US9472200B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2016 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Mar 24, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/06
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A threshold amplitude is calculated for each subband obtained by splitting an extension band. For each subband, an amplitude of transform coefficients is compared with the threshold amplitude to extract a transform coefficient having an amplitude larger than the threshold amplitude as a representative transform coefficient. When a number of the extracted representative transform coefficients is less than a predetermined number, the threshold amplitude is updated in accordance with an amount by which the number of the representative transform coefficients is less than the predetermined number. A transform coefficient is extracted again using the updated threshold amplitude. For each of the subbands, a value of correlation is calculated between the representative transform coefficient and a normalized core encoded low-band transform coefficient. A subband having a largest value of correlation is selected when the number of the extracted representative transform coefficients reaches the predetermined number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.