Tone detector and multifrequency receiver using said detector

Details Tone detector and multifrequency receiver using said detector Tone detector and multifrequency receiver using said detector

H - Electricity

04

M

379/20

H04M 1/26 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 1188015

ABSTRACT TONE DETECTOR AND MULTIFREQUENCY RECEIVER USING SAID DETECTOR The purpose of the receiver is to indicate the reception of a multifrequency signal and to iden- tify said signal. A multifrequency signal is a signal combining two predetermined pure tones, one belonging to a high-frequency range, the other to a low-frequency range. The received signal is sampled at 8 KHz and digitally converted. The signal provided by the converter is simultaneously processed by two tone detectors. Each tone detect- or comprises : a bandpass filter covering the high- or low-frequency range and supplying the components (x, y) of the filtered signal in Car- tesian coordinates; decimation means at the output of said filters; a converter converting the Car- tesian coordinates (x, y) into polar coordinates (p, .THETA.); and logic circuits analyzing the varia- tions of said p and .theta. over fixed periods of time to derive therefrom an identification of the received tone.

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