Supervisory audio tone detection in a radio channel

Details Supervisory audio tone detection in a radio channel Supervisory audio tone detection in a radio channel

H - Electricity

04

B

325/122

H04B 1/16 (2006.01) H04Q 1/442 (2006.01)

Patent

CA 1250024

- 18 - SUPERVISORY AUDIO TONE DETECTION IN A RADIO CHANNEL Abstract Supervisory audio tones received from a mobile telephone unit are converted from analog to digital form. The tone is then converted to a complex number by bifurcating the tone path and multiplying one path by a sine function and the other path by a cosine function. The complex numbers are accumulated and the frequencies where significant power exists is found using the discrete Fourier transform. If the power at an assigned frequency exceeds a threshold, the corresponding supervisory audio tone is declared to have been detected.

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