Transmission line signal sensing circuit employing means for...

Details Transmission line signal sensing circuit employing means for... Transmission line signal sensing circuit employing means for...

H - Electricity

04

M

328/177

H04M 3/26 (2006.01) H04B 3/46 (2006.01) H04M 3/30 (2006.01)

Patent

CA 1250909

ABSTRACT OF THE DISCLOSURE An apparatus and method for sensing a predetermined tone signal transmitted on a transmission line, such as a telephone transmission line, and for generating a signal indicating the presence of the tone signal. The apparatus comprises a tone detector circuit including an amplifier, bandpass filter and comparator, a power supply for generating power for the detector circuit from a voltage present on the transmission line and logic circuitry for gating pulses of power from the power supply to the detector circuit on a periodic basis thereby to enable the detector circuit to check for the presence of the tone signal during the durations of the power pulses.

521067

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