Dial pulse digit detector
First Claim
1. A method for detecting and identifying dial pulse digits in a telephone signal comprises the steps of:
- detecting a series of pulses referred to as clicks which comprise one or more predetermined dial pulse digits;
analyzing the clicks of the one or more predetermined dial pulse digits to determine a predetermined set of data to provide a template, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks;
detecting a series of clicks which comprise a further dial pulse digit;
analyzing the clicks of the further dial pulse digit to determine a further predetermined set of data, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; and
comparing the further predetermined set of data with the data comprising the template to identify the further dial pulse digit.
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Accused Products
Abstract
Method and apparatus for detecting and identifying dial pulse digits in a telephone signal. An embodiment of the inventive method includes the steps of: detecting a dial pulse "0" digit; analyzing the dial pulse "0" digit to determine a predetermined set of data to provide a template which is characteristic of the dial pulse "0" digit; detecting a further dial pulse digit; analyzing the further dial pulse digit to determine a predetermined set of data which is characteristic of the further dial pulse digit; and comparing the predetermined set of data of the further dial pulse digit with the template to identify the further dial pulse digit.
25 Citations
12 Claims
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1. A method for detecting and identifying dial pulse digits in a telephone signal comprises the steps of:
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detecting a series of pulses referred to as clicks which comprise one or more predetermined dial pulse digits; analyzing the clicks of the one or more predetermined dial pulse digits to determine a predetermined set of data to provide a template, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; detecting a series of clicks which comprise a further dial pulse digit; analyzing the clicks of the further dial pulse digit to determine a further predetermined set of data, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; and comparing the further predetermined set of data with the data comprising the template to identify the further dial pulse digit. - View Dependent Claims (7, 8, 9, 11)
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2. A method for detecting dial pulse digits in a telephone signal comprises the steps of:
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detecting a series of pulses referred to as clicks which comprise a dial pulse "0" digit; analyzing the clicks of the dial pulse "0" digit to determine a predetermined set of data to provide a template, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; detecting a series of clicks which comprise a further dial pulse digit; analyzing the clicks of the further dial pulse digit to determine a further predetermined set of data, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; and comparing the further predetermined set of data with the data comprising the template to identify the further dial pulse digit. - View Dependent Claims (3, 4, 10)
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5. A method for obtaining a template for use in detecting and identifying dial pulse digits in a telephone signal comprises the steps of:
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detecting a series of pulses referred to as clicks which comprise one or more predetermined dial pulse digits; analyzing the clicks of the one or more predetermined dial pulse digits to determine a predetermined set of data to provide the template, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; and storing the template. - View Dependent Claims (12)
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6. An apparatus for detecting and identifying dial pulse digits in a telephone signal comprises:
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detection means, responsive to the telephone signal, for detecting a series of pulses referred to as clicks which comprise a dial pulse "0" digit; analysis means, responsive to output from the detection means, for analyzing clicks of the dial pulse "0" digit to determine a predetermined set of data to provide a template, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; the detection means, being responsive to a further telephone signal, for detecting a series of clicks which comprise a further dial pulse digit; the analysis means, being responsive to output from the detection means relating to the further dial pulse digit, for analyzing the clicks of the further dial pulse digit to determine a further predetermined set of data, the data comprising a measure of energy, length, and number of zero crossings for each of the clicks; and means for comparing the further predetermined set of data with the data comprising the template to identify the further dial pulse digit.
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Specification