Fractional sampling filter
US7498958B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2007 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Jul 19, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0455
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fractional up-sampling filter is configured to convert a lower data rate to a higher data rate by using methods of interpolation to generate output digital data that corresponds to the higher data rate. For example, if the higher data rate output is 4/3 of the lower data rate input, then for every three (3) digital data values originally sampled by the fractional up-sampling filter, four (4) output digital data values are generated and output from the filter. These output digital data values are obtained by methods of interpolation. Interpolation is performed using different filter coefficients depending on the relative timing of the output digital data rate versus the original sampling rate. The fractional up-sampling filter utilizes a high frequency master clock to derive the fractional relationship between the original sampling rate to the new fractional sampling rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.