Method and apparatus for detecting a supervisory audio tone

Details Method and apparatus for detecting a supervisory audio tone Method and apparatus for detecting a supervisory audio tone

H - Electricity

04

M

H04M 3/22 (2006.01) H04B 7/26 (2006.01) H04B 17/00 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2101501

- 10- METHOD AND APPARATUS FOR DETECTING A SUPERVISORY AUDIO TONE Abstract The presence of a supervisory audio tone signal (SAT), superimposed on a voice/data signal transmitted in a cellular telephone system, is carried out by first deleting the voice/data signal, leaving only the SAT signal. Thereafter, the SAT signal power and noise power are determined. During intervals when the SAT signal rises and falls, the SAT noise power and signal power move in opposite directions. By comparing the SAT noise power to the SAT signal power, a fast, accurate determination can be made as to whether the SAT signal is present.

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