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

1983-06-27

1985-08-06

Safourek, Benedict V.

Pulse or digital communications

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Direct sequence

34082548, 364724, G06F 1531, H04M 150

Patent

active

045340439

ABSTRACT:
The presence of a predetermined pure sinusoidal 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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