Hierarchical audio frequency encoding and decoding method and system, hierarchical frequency encoding and decoding method for transient signal
US8874450B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2011 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Oct 16, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/025
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Hierarchical audio coding and decoding method and system and hierarchical audio coding and decoding method for transient signals are provided. In the present invention, by introducing a processing method for transient signal frames in the hierarchical audio coding and decoding methods, a segmented time-frequency transform is performed on the transient signal frames, and then the frequency-domain coefficients obtained by transformation are rearranged respectively within the core layer and within the extended layer, so as to perform the same subsequent coding processes, such as bit allocation, frequency-domain coefficient coding, etc., as those on the steady-state signal frames, thus enhancing the coding efficiency of the transient signal frames and improving the quality of the hierarchical audio coding and decoding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.