Dialing pulse signature recognizing method and device

Details Dialing pulse signature recognizing method and device Dialing pulse signature recognizing method and device

1990-09-21

1993-01-05

Dwyer, James L.

Telephonic communications

Repeater

With signal conversion

379102, 379283, H04M 100, H04M 342

Patent

active

051777819

ABSTRACT:
A method and device for recognizing a signature of dialing pulse present in a communication signal isolate from the latter signal the signature. The so isolated signature is correlated with a statistic model obtained from a large number of dialing pulse signatures to determine whether the isolated signature corresponds to a dialing pulse. During this correlation, a first complex function representative of the isolated signature is calculated and correlated with a second complex function representative of the statistic model. The result of the correlation is normalized and whether the isolated signature is a signature of dialing pulse is decided in function of this normalization. The method and device can be used to convert into a tone frequency signal a series of dialing pulse signatures present in the communication signal and corresponding to a dialed digit. Each recognized signature is counted in order to determine the number of signatures in the series and a tone signal having a frequency which is function of this counted number is generated.

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