Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent
1996-12-26
2000-02-22
Weaver, Scott
Telephonic communications
Supervisory or control line signaling
Signal receiver
379 9309, 379350, H04M 908
Patent
active
060289279
ABSTRACT:
The present invention proposes a method and a device for detecting, amongst a set of signals, the presence of a periodic signal of period of occurrence T, in which a signal discriminating the said signal in the said set of signals is delivered. According to the invention, the discrimination signal is sampled in ln samples over more than one period T, a state value B(i) representing its level, and a true correlation value SR is calculated, by cumulating, for pairs of samples i and i+Z, the instantaneous value of correlation between the state value B(i) and the state value B(i+Z), the samples i and i+Z being located at instants shifted by a period T. Then, for said pairs od samples, the rate r of samples having the said signal over the total number of samples is measured, at least one so-called "theoretical correlation average" value is determined, and the true correlation value SR is compared with each theoretical correlation average value and from this the presence or absence of the signal to be detected is deduced.
REFERENCES:
patent: 4312074 (1982-01-01), Pautler et al.
patent: 4490831 (1984-12-01), Poston et al.
patent: 5185783 (1993-02-01), Takahashi et al.
patent: 5343420 (1994-08-01), Marata et al.
patent: 5390244 (1995-02-01), Hinman et al.
Delumeau Fran.cedilla.ois
Piret Philippe
Canon Research Centre-France S.A.
Weaver Scott
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