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Portable device for monitoring local area

  • US 4,558,181 A
  • Filed: 04/27/1983
  • Issued: 12/10/1985
  • Est. Priority Date: 04/27/1983
  • Status: Expired due to Term
First Claim
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1. A portable, self-contained device for monitoring a selected local area, having a standard telephone terminal with standard external telephone lines for occurrence of any one of a plurality of preselected conditions adjacent said local area, said device comprising:

  • (a) means for setting in said device a first identification number corresponding to a telephone number for the external lines into said selected local area;

    (b) means for selectively connecting said device onto said standard external telephone lines installed at said selected local area;

    (c) means for creating in said device a distinct signal upon occurrence of one of said plurality of preselected conditions;

    (d) means for generating in said device a first synthesized voice message in response to said distinct signal;

    (e) means for amplifying and playing said first synthesized voice message at local area upon its creation;

    (f) means for creating a first telephone format dialing signal corresponding to a second identification number of a first, remote preselected telephone on said lines in response to said distinct signal;

    (g) cycling means for repeatedly creating said first dialing signal on said lines at a time interval including at least one pause period during which said device releases said lines for a call back signal indicative of an incoming call to said first indentification number;

    (h) means for creating an answer signal upon recognizing the occurrence of an answer at said first remote telephone;

    (i) means for creating a second synthesized voice signal in response to an answer signal wherein said second synthesized voice signal includes a representation of said first identification number;

    (j) switch means for directing said second synthesized voice signal as intelligence to said lines;

    (k) first termination means for terminating operation of said dialing signal creating means in response to a call on said lines only during said at least one pause; and

    ,(l) means for connecting a standard telephone set to said external lines through said device.

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