Efficient scalefactor estimation in advanced audio coding and MP3 encoder
US8548816B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2009 |
| Grant date | Oct 1, 2013 |
| Priority date | — |
| Expiry date | May 26, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/035
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An efficient approach for estimating scalefactors for use in the quantization of audio signal spectrum values is described. The scalefactor estimation approach can be implemented in multiple stages. A first stage estimates a distortion level for a selected scalefactor band spectrum value based on a received maximum tolerant distortion threshold and the spectrum values in the scalefactor band. A second stage determines an interim process value based on the previously estimated distortion level and generates a scalefactor for a selected scalefactor band spectrum value based on the generated interim process value and a statistically predetermined fraction. A third stage generates a scalefactor that applies to the whole scalefactor band based on the scalefactor generated for the selected scalefactor band spectrum value. The approach provides a performance gain of 40% over previous techniques, thereby reducing device power requirements and audio encoder bottlenecks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.