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CARD CONTROL OF RADIO TELEPHONE

  • US 3,581,019 A
  • Filed: 07/30/1968
  • Issued: 05/25/1971
  • Est. Priority Date: 07/30/1968
  • Status: Expired due to Term
First Claim
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1. In a card controlled telephone number responding device for rendering a radiotransceiver in a radiotelephone system responsive to a received call number matching a number stored on a card, said radio transceiver including means for receiving a call signal bearing information representing the digits of a number stored on said card, means for converting said call signal to sets of dial pulses, in the sequence received digit for received digit, counter means for converting each set of said dial pulse sets to a digit corresponding to the number of said dial pulses, said counter having an output corresponding to each digit, a crossbar matrix having rows and columns of matrix crosspoints, means connecting one side of said crossbar matrix to the outputs of said counter means, digit for digit, a call number bearing control card, means guiding said control card into registry with said crossbar matrix, said control card having a plurality of matrix positions corresponding in number and position to the number and positions of said matrix cross-points, selected ones of said positions on said card having means for making a cross-point connection in said crossbar matrix, digit sequence storage means, said digit sequence storage means comprising a plurality of cascaded digit storage register circuits, each having as one input an output from said matrix and each of said trigger circuits except the first being rendered operable in sequence from the second to the last on operation of a preceding trigger and an output from said matrix at a corresponding cross-point made by said means on said card for making a cross-point connection at a selected position, respectively, an alarm device actuated on actuation of the last of said trigger circuits, means for mounting said radio transceiver on a vehicle having a key-operated ignition switch, and means connectable in circuit with said ignition switch for preventing insertion of said control card into operative relationship with said crossbar matrix unless the ignition switch has been turned on by a key therein.

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