Transmission line signal sensing circuit employing means for con

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

1985-12-02

1987-08-11

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

379399, 379 29, H04M 326, H04B 346

Patent

active

046866965

ABSTRACT:
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.

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