Disturbance signal detector for blanking circuit control
US3958181A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1975 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | May 6, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/345
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency sensitive network responsive to frequencies somewhat above the useful signal band of a demodulated radio signal is interconnected with the inputs of a differential amplifier, so that the desired signal and the portions of the interference signals unaffected by the frequency sensitive circuit cancel out and a "stripped" interference signal is obtained which is fed to a transistor circuit that produces trigger pulses for a multivibrator, regardless of which side of the differential amplifier first produces a pulse. The multivibrator provides pulses to a blanking switch and also charges a capacitor in a RC network, in which charge accumulates when the control pulses are bunched closely in time and this effect is used to produce a bias for disabling the provision of trigger pulses to the multivibrator until the capacitor charge leaks off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.