Tunable bandpass filter system and filtering method
US5136267A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1990 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Dec 26, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tunable bandpass filter system and filtering method wherein the bandwidth of a tunable bandpass filter is adjusted as a function of the fundamental frequency of an input signal. Either a constant bandwidth or a constant quality factor tunable bandpass filter may be used. The center frequency of the tunable bandpass filter is adjusted in direct proportion to the product of the fundamental frequency and the number of a selected harmonic thereof. In the case of a constant bandwidth filter the bandwidth is adjusted in direct proportion to the quotient of the fundamental frequency divided by a selected filter quality factor. In the case of a constant quality factor filter, the bandwidth is indirectly controlled by adjusting the center frequency while adjusting the quality factor in inverse proportion to the harmonic number. The output amplitude of the filter is measured to determine the amount of distortion in the input signal. The fundamental frequency may be determined by measuring the input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.