Dialing pulse signature recognizing method and device

A device for recognizing a signature of dialing signal present in a communication signal, comprising:

• means for storing a statistic model of said signature previously obtained from a large number of dialing signal signatures present in communication signals;
• means for isolating said signature from said communication signal;
• and
• means for correlating the isolated signature with said statistic model to determine whether said isolated signature corresponds to said dialing signal, said correlating means comprising means for calculating a first complex function representative of said isolated signature and means for correlating said first function with a second complex function representative of the statistic model.

A method of converting into a tone frequency signal a series of dialing pulse signatures present in a communication signal and corresponding to a dialed digit, comprising the steps of:

• storing a statistic model of said dialing pulse signatures previously obtained from a large number of dialing pulse signatures present in communication signals;
• isolating each pulse signature from said communication signal;
• correlating each isolated signature with said statistic model to determine whether said isolated signature is effectively a dialing pulse signature, said correlating step comprising calculating a first complex function representative of said isolated signature and correlating said first function with a second complex function representative of the statistic model;
• counting each isolated signature recognized as being effectively a dialing pulse signature to determine the number of signatures in the series;
• and
• generating a tone frequency signal having a frequency which is function of the number of pulse signatures in the series.

A device for converting into a tone frequency signal a series of dialing pulse signatures present in a communication signal and corresponding to a dialed digit, comprising:

• means for storing a statistic model of said dialing pulse signatures previously obtained from a large number of dialing pulse signatures present in communication signals;
• means for isolating each pulse signature from said communication signal;
• means for correlating each isolated signature with said statistic model to determine whether said isolated signature is effectively a dialing pulse signature, said correlating means comprising means for calculating a first complex function representative of said isolated signature and correlating said first function with a second complex function representative of the statistic model;
• means for counting each isolated signature recognized as being effectively a dialing pulse signature to determine the number of pulse signatures in the series;
• and
• means for generating a tone frequency signal having a frequency which is function of the number of pulse signatures in the series.