Filter for digital-to-analog converters
US6337645B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 2000 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Mar 9, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0621
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An analog-to-digital converter responsive to an analog signal converts the analog signal to a digital signal. A digital decimation filter, having an associated frequency response, is responsive to the digital signal for producing a decimated digital signal. An alias correction filter attenuates the decimated digital signal to remove distortion. A digital interpolation filter, having an associated frequency response, is responsive to the alias-corrected signal for producing an interpolated digital signal which subsequently is converted to an analog signal by a digital-to-analog converter. The alias correction filter has a frequency response that attenuates the decimated digital signal in a frequency range generally corresponding to a distortion portion that is present within the combination of the digital decimation filter frequency response and the digital interpolation filter frequency response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.