Digital sample rate conversion
US5602762A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1994 |
| Grant date | Feb 11, 1997 |
| Priority date | — |
| Expiry date | Aug 26, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rate converter for digitally converting the sample rate of a signal, has a first digital filter for deriving an intermediate signal at increased sample rate and a second digital filter for deriving an output signal at a decreased sample rate relative to that of the intermediate signal. The first filter is of relatively high order serving to double the frequency. Because the frequency change is a power of two, the aperture characteristic is straightforward and implementation is simple even at high order. The second filter is of relatively low order so that implementation is simple even with a time-varying aperture characteristic. The low order of the second filter does not however degrade the overall frequency characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.