Interference pulse suppression circuit for radio receivers
US3995220A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1975 |
| Grant date | Nov 30, 1976 |
| Priority date | — |
| Expiry date | Aug 14, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/345
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Radio frequency disturbance recognition circuits having their inputs tuned to different frequency bands by resonant circuits are coupled to the antenna input of a receiver to be protected through a decoupling stage that prevents excessive coupling and AND-gates are provided so that an interference blanking circuit will be operated to produce a momentary interruption of the low-frequency signal path only when a disturbance is detected by the radio frequency recognition circuits in both of their respective operating frequency ranges and at the same time a pulse disturbance is detected in the output of the receiver demodulator by a disturbance voltage detector circuit tuned to a frequency band higher than the frequency band of the low-frequency signal to be protected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.