Amplitude adaptive filter
US5488576A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1994 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | Feb 22, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0286
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital filter transfer function is implemented using at least two implementing filters, one of which has a transfer function which guarantees an output which is unconditionally within a predefined output compliance range, and the other of which has a transfer function equal to the difference between the overall desired transfer function and the transfer function of the first implementing filter. Typically, the output samples produced by the two implementing filters are summed to provide an overall output sample. However, if the sum of an output sample from one of the implementing filters and the corresponding output sample from the other implementing filter falls either above or below predetermined threshold values, then the output of the first implementing filter, instead of the summed output, is provided as the sample output of the overall filter. Transient undershoots and overshoots are thus prevented, while the response of the filter is degraded only when necessary to avoid compliance range violation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.