Method and device for detecting the presence of a periodic signal in a set of signals

摘要

Method and device for detecting the presence of a periodic signal amongst a set of signals, the said signal having a periodic repetition of a frequency during a predetermined duration (TON), the frequency, the period T and the duration (TON) being given respective predetermined tolerances (dT, dTON) . The method includes: the discrimination of the frequency in question from the other frequencies of the set of signals and the delivery of an output signal at two levels; the sampling of the latter; the detection and weighing of a series of samples Si of a level corresponding to the presence of the said frequency; the creation of a history by projecting in a future time interval a value Histo(j) equal to the weight P1 of the series Si; calculation, where applicable, of the degrees of correlation between the weight Pi calculated for the series Sj of the instant tj and the value Histo(j) corresponding to the weight Pi relating to the series located at ti, and the decision as to the presence or absence of the signal according to the said degrees of correlation. Application to the detection of the CNG. <IMAGE> <IMAGE> <IMAGE>