Dialing pulse signature recognizing method and device
First Claim
1. A method for recognizing a signature of dialing signal present in a communication signal, comprising the steps of:
- storing a statistic model of said signature previously obtained from a large number of dialing signal signatures present in communication signals;
isolating said signature from said communication signal; and
correlating said isolated signature with said statistic model to determine whether said isolated signature corresponds to said dialing signal, 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.
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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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Citations
15 Claims
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1. A method for recognizing a signature of dialing signal present in a communication signal, comprising the steps of:
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storing a statistic model of said signature previously obtained from a large number of dialing signal signatures present in communication signals; isolating said signature from said communication signal; and correlating said isolated signature with said statistic model to determine whether said isolated signature corresponds to said dialing signal, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for recognizing a signature of dialing signal present in a communication signal, comprising:
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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. - View Dependent Claims (11, 12, 13)
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14. 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:
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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.
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15. 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:
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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.
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Specification