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Integrated speaker supervision and alarm system

  • US 5,345,510 A
  • Filed: 07/13/1992
  • Issued: 09/06/1994
  • Est. Priority Date: 07/13/1992
  • Status: Expired due to Term
First Claim
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1. A supervision circuit for monitoring the path integrity in an audio system, in which the audio system is of the type having a central switching location driving at least one speaker via a wire pair connecting the central switching location to the speaker, the supervision circuit comprising, in combination:

  • a source at the central switching location for injecting a distinctive signal onto the wire pair which drives the speaker, such that the signal passes through the speaker without disconnecting the wire pair and speaker from the audio system;

    a detector at the central switching location for responding to the signal on the same wire pair and evaluating the path integrity based on the condition of the signal; and

    a controller responsive to the status of the integrity of the connected wire pair and the speaker for indicating the nature of the signal detected.

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