Low power signal detection
First Claim
1. A detector for detecting a signal at a signaling frequency on a transmission line carrying a communication signal comprising signaling frequencies and noise, said detector comprising:
- a resonator having an input configured for coupling to the transmission line to receive the communication signal, an output for outputting a resonated signal, and a control used to configure said resonator;
a controller coupled to said control of said resonator for configuring said resonator in a first state corresponding to the signaling frequency and in a second state corresponding to a reference frequency; and
a comparator coupled to the output of said resonator for comparing a first value of said resonated signal at the output of said resonator configured in said first state to a second value of said resonated signal at the output of said resonator configured in said second state, said comparator generating an indicator based on the comparison.
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Abstract
The present invention provides a low power method and apparatus for detecting a signaling tone. The apparatus comprises a resonator which can be configured to resonate at a specified frequency, a controller for configuring the resonator, and a comparator for comparing the output of the resonator as configured by the controller. The method comprises configuring the resonator to resonate at a first frequency to generate an output, configuring the resonator to resonate at a second frequency to generate an output, comparing the outputs, and indicating the presence of a signal if the output of the resonator configured to resonate at a first frequency exceeds the output of the resonator configured to resonate at a second frequency by a predefined amount.
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Citations
23 Claims
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1. A detector for detecting a signal at a signaling frequency on a transmission line carrying a communication signal comprising signaling frequencies and noise, said detector comprising:
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a resonator having an input configured for coupling to the transmission line to receive the communication signal, an output for outputting a resonated signal, and a control used to configure said resonator;
a controller coupled to said control of said resonator for configuring said resonator in a first state corresponding to the signaling frequency and in a second state corresponding to a reference frequency; and
a comparator coupled to the output of said resonator for comparing a first value of said resonated signal at the output of said resonator configured in said first state to a second value of said resonated signal at the output of said resonator configured in said second state, said comparator generating an indicator based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A tone detector for detecting the presence of a signaling tone on one of a plurality of potential signaling tone frequencies on a telephone line carrying a communication signal, said tone detector comprising:
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a resonator having an input configured for receiving the communication signal, a control for configuring the resonator, and an output for outputting a resonated signal which is partially dependent on the configuration of said resonator; and
a state machine coupled to said resonator for configuring said resonator and processing said resonated signal generated by said resonator to produce an indicator. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23)
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17. A method for detecting the presence of a signaling tone on one of a plurality of potential signaling tone frequencies in a communication signal on a transmission line comprising the steps of:
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(1) receiving the communication signal at a resonator;
(2) configuring said resonator to resonate at one of the potential signaling tone frequencies;
(3) capturing and storing a first value output by said resonator configured to resonate at said one of the potential signaling tone frequencies;
(4) configuring said resonator to resonate at a reference frequency;
(5) capturing and storing a second value output by said resonator configured to resonate at said reference frequency;
(6) comparing said first value to said second value; and
(7) generating an indicator indicating whether said first value exceeds said second value by a predefined amount.
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Specification