Switch-tuned filters
US4389683A · kind A · utility
3Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1980 |
| Grant date | Jun 21, 1983 |
| Priority date | — |
| Expiry date | Oct 20, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/035
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A switch-tuned filter comprises a capacitive filter and a resonant filter both receiving an input signal to be filtered. The resonant filter comprises a gyrator the frequency response of which depends on circuit parameters in two circuit paths therein. A tuning switch is arranged to select the values of the parameters in each of these circuit paths. The output signals of the gyrator and the capacitive filter are combined to form the filtered output signal. The circuit can be used as an equalizer in a magnetic tape recorder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.