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Pacemaker telemetry system

  • US 5,350,411 A
  • Filed: 06/28/1993
  • Issued: 09/27/1994
  • Est. Priority Date: 06/28/1993
  • Status: Expired due to Term
First Claim
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1. A telemetry system for communicating digital information via a radio-frequency signal, comprising:

  • an antenna, adapted to receive said radio-frequency signal;

    an RF detect circuit, coupled to said antenna and responsive to said radiofrequency signal to convert said radio-frequency signal into a digital pulse stream;

    a clock, responsive to assertion of a clock activation signal to produce a clock signal at a clock output terminal thereof;

    a clock activation circuit, coupled to said RF detect circuit to receive said digital pulse stream, and coupled to said clock, said clock activation circuit responsive to a first predetermined characteristic of said digital pulse stream to assert said clock activation signal, and responsive to a second predetermined characteristic of said digital pulse stream to deassert said clock activation signal;

    a counter, coupled to said clock output terminal and adapted to present a plurality of count value output signals representing said counter'"'"'s count value at a plurality of output terminals thereof, said counter responsive to a cycle of said clock signal to increment said count value;

    a logic array, coupled to said counter output terminals to receive said count value output signals, and coupled to said RF detect circuit to receive said digital pulse stream, said logic array responsive to a first predetermined combination of said counter value output signals and said digital pulse stream to assert a first output signal indicative of a digital "1" encoded into said radio-frequency signal, said logic array responsive to a second predetermined combination of said counter value output signals and said digital pulse stream to assert a second output signal indicative of a digital "0" encoded into said radio-frequency signal.

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