State determination method of an on/off modulated alternating signal in a disturbed environment

摘要

According to the invention, the method consists in comparing on reception the amplitude of the useful alternating signal with that of at least one unmodulated reference signal emitted permanently with the same amplitude and with a neighboring frequency, and undergoing the same medium. disturbed The circuit for implementing the invention comprises three bandpass filters (2, 3, 4), two operational amplifiers (5, 6), two comparators (10, 11) and an AND gate (13). Application to the punctual transmission of information in the railway sector.