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

1985-02-04

1987-10-06

Harcom, Gary V.

Boots, shoes, and leggings

364726, G06F 738

Patent

active

046987690

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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