EP 0065904 B1 19850807 - STATE DETERMINATION METHOD OF AN ON/OFF MODULATED ALTERNATING SIGNAL IN A DISTURBED ENVIRONMENT
Title (en)
STATE DETERMINATION METHOD OF AN ON/OFF MODULATED ALTERNATING SIGNAL IN A DISTURBED ENVIRONMENT
Publication
Application
Priority
FR 8109919 A 19810519
Abstract (en)
[origin: US4555791A] The state of an all-or-none modulated useful signal subjected to a perturbed environment is determined, on reception, through the use of non-modulated reference signals subjected to the same environment. The reference signals have respective frequencies neighboring that of the useful signal and the same initial amplitude so that all of the signals are attenuated in the same manner by environmental perturbations. By comparing against a threshold reference value the differences between the respective amplitudes of the received reference signals and the amplitude of the received useful signal, the "all" and "none" states of the useful signal are accurately determined irrespective of the effect of perturbed environment on the amplitude of the useful signal.
IPC 1-7
IPC 8 full level
B61L 3/24 (2006.01)
CPC (source: EP US)
B61L 3/243 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0065904 A1 19821201; EP 0065904 B1 19850807; AU 553426 B2 19860717; AU 8353582 A 19821125; BR 8202530 A 19830419; CA 1189917 A 19850702; DE 3265208 D1 19850912; FR 2506544 A1 19821126; FR 2506544 B1 19831028; US 4555791 A 19851126; ZA 823474 B 19830330
DOCDB simple family (application)
EP 82400854 A 19820510; AU 8353582 A 19820510; BR 8202530 A 19820503; CA 402024 A 19820430; DE 3265208 T 19820510; FR 8109919 A 19810519; US 37780382 A 19820513; ZA 823474 A 19820519