Frequency filter
US4006437A · kind A · utility
4Cited by
5References
3Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 27, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Jun 27, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/60
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A band-pass filter comprising a plurality of coupled electromechanical filters is disclosed. Each electromechanical filter has a frequency pass-band centered about a fundamental frequency and a plurality of higher frequency pass-bands which are centered about overtones of the fundamental frequency. At least one of the electromechanical filters has a fundamental frequency that is different from the other filters and all the filters have a common overtone frequency. The band-pass filter will pass all frequencies falling within the band about the common overtone frequency, while all other frequencies will be suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.