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ELECTROCARDIOGRAPH TELEMETRY SYSTEM HAVING CIRCUITRY FOR INDICATING INOPERATIVE CONDITIONS

  • US 3,768,017 A
  • Filed: 12/14/1971
  • Issued: 10/23/1973
  • Est. Priority Date: 12/14/1971
  • Status: Expired due to Term
First Claim
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1. A system for wireless transmission of electrical signals, comprising:

  • an input circuit having an electrode for receiving an input signal applied thereto;

    transmitter means including frequency-control means connected to said input circuit for radiating an output signal that is modulated by a subcarrier signal means which is modulated within a preselected band of frequencies by an input signal applied to said electrode, and means for radiating said output signal modulated by a said subcarrier signal having a signal frequency outside the limits of said band in response to an open-circuit electrode of the input circuit;

    reception means including a demodulator adapted to receive the radiated output signal for producing said subcarrier signal therefrom; and

    detector means connected to said reception means for producing a first output indicative of reception of the radiated output signal modulated by said signal frequency.

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