US 2002/0159584 A1 · Low power signal detection

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.

Claims23

Dependent claims

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.

1 more element

Dependencies are inferred from the claim text.

Low power signal detection

Life of this patent

Low power signal detection

Life of this patent

Abstract

Claims23