Digital resonant shelf filter
US7831645B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2005 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Apr 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0211
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and system for designing a discrete-time filter having a transfer function which approximates that of an analog shelf filter is disclosed. Prior art methods include applying the bilinear transform to the analog filter, which has the drawback of warping high-frequency features of the desired transfer function. In an embodiment of the present invention, an analog filter is designed which anticipates the warping imposed by the bilinear transform. For filters whose features approach the Nyquist limit, the inventive method provides a closer approximation to the analog response than direct application of the bilinear transform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.