Multi-frequency tone detector

Details Multi-frequency tone detector Multi-frequency tone detector

H - Electricity

04

Q

H04Q 1/45 (2006.01) H04Q 1/46 (2006.01)

Patent

CA 2342467

A multi-frequency tone detector with analysis window (i.e. filter size) chosen such that spectral nulls are located at adjacent frequencies of interest. The decision logic block of the tone detector uses the roll-off characteristics of the filter in conjunction with background noise to determine a threshold pass/fail for any tone that has deviated excessively from its nominal value. The foregoing aspects of the invention result in simple filter design (i.e. reduced order) relative to prior art tone detectors.

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