Low power signal detection

Details Low power signal detection Low power signal detection

2005-08-30

2005-08-30

Tieu, Binh (Department: 2643)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C379S286000, C379S290000, C375S152000

Reexamination Certificate

active

06937717

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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