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Telephone monitoring and alarm device

  • US 5,923,731 A
  • Filed: 06/30/1997
  • Issued: 07/13/1999
  • Est. Priority Date: 06/30/1997
  • Status: Expired due to Fees
First Claim
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1. A telephone monitoring and alarm apparatus which monitors a telephone line entering a user'"'"'s location and other alarms for recognition of conditions predetermined by the user and initiates a programmable response, the monitoring and alarm apparatus comprising;

  • a) telephone line sensing means for sensing the voltage upon a telephone line and determining whether the telephone line is busy or cut and providing an output indicative thereof;

    b) a second sensing means for detecting the occurrence of a predetermined event;

    c) a signal reception means to receive signals from a remote sensing means;

    d) a processing means for processing and prioritizing inputs, retrieving information from an information storage means, and implementing programs and instructions contained in said information and transmitting alert messages;

    e) a programming means to program information to be utilized upon the occurrence of a predetermined condition by said processing means;

    f) an information storage means to store information provided by said programming means for later retrieval by said processing means;

    g) an alerting means which upon receipt of said alert messages from said processing means notifies predetermined locations or users;

    h) a system status display means which displays the operating status of said telephone monitoring and alarm apparatus as determined by said processing means;

    i) a power supply means for providing power to all components of said telephone monitoring and alarm apparatus;

    j) an attenuation means for attenuating the incoming telephone line signal so as to provide an output suitable for further processing;

    k) a polarity compensating means and voltage comparison means for comparing the signal strength on the telephone line against a predetermined reference voltage to determine whether the telephone line is busy or cut and providing an output indicative thereof; and

    l) said voltage comparison means is a voltage dividing network connected to four op amps such that a line voltage within a predetermined range indicates the telephone line is busy while a line voltage less than a predetermined value indicates the telephone line is cut, said polarity compensation means is accomplished by two op amps configured for a positive polarity telephone line signal while the remaining two op amps are configured for a negative polarity telephone line signal.

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