Test tone detector apparatus and method modem using same

Details Test tone detector apparatus and method modem using same Test tone detector apparatus and method modem using same

H - Electricity

04

B

328/159, 379/5

H04B 17/00 (2006.01) H04L 1/24 (2006.01)

Patent

CA 1209731

TEST TONE DETECTOR APPARATUS AND METHOD MODEM USING SAME ABSTRACT OF THE DISCLOSURE The presence of a predetermined pure sinu- soidal signal is detected by periodically sampling the actual value of an input electrical signal and, based thereon, predicting what the expected value of the sinusoid would be at a next sampling instant if it is present. The actual and predicted future input signal values are then compared and a running average signal of the thus detected errors in predictions over plural such sampling and prediction cycles are compared to a preset threshold signal value to detect the presence of the predetermined tone. A modem receiver is turned off in the exemplary embodiment when the predetermined test tone is detected to prevent false data or "garbage" being output therefrom.

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