FM Demodulator with variable bandpass filter
US4458207A · kind A · utility
37Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1981 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Sep 16, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The demodulator combines a conventional frequency discriminator with a bandpass filter for removing the noise which is present from the band occupied at a given instant by the modulated signal. The center frequency of the bandpass filter is controlled in dependence on the instantaneous frequency of the modulated signal and its bandwidth b.sub.u is controlled in dependence on the instantaneous width of the band occupied by the modulated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.