Enhanced control for compression and decompression of sampled signals
US7791508B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2009 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Mar 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/002
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Control of signal compression is coordinated by selectively modifying control parameters affecting the bit rate, sample rate, dynamic range and compression operations. Selected control parameters are modified according to a control function. The control function can include a ratio parameter that indicates the relative or proportional amounts of change to the control parameters. Alternatively, the control function can be represented in a lookup table with values for the selected control parameters related by the control function. Downsampling the input signal samples according to a sample rate control parameter is followed by upsampling to the original sample rate. Errors are calculated between the upsampled and original signal samples. Encoding of the downsampled signal samples and the error samples is performed in accordance with a compression control parameter. The sample rate control parameter and compression control parameter are determined based on the control function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.