TI window compression/expansion method
US6748363B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2000 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Nov 14, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/022
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
According to the present invention, there is developed a proprietary technology for compressing the window tables of audio coders to ⅛ their original size (or less) without any loss of quality. This technology can be applied to all transform based audio coders, or any audio coder that uses a windowing stage. The novel technique for reducing storage requirements for the window tables of audio coders is based on multiple differentiation. Since the difference between any two adjacent samples in the first difference signal is small, so it is more efficient to store this difference. This technique can be carried out several more times, until the returns get smaller, and the computational requirements to “undo” the compression go up. The optimum number of times to differentiate is dependent on the particular application and the window shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.