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Noise generator circuit for a security system

  • US 4,064,507 A
  • Filed: 05/29/1975
  • Issued: 12/20/1977
  • Est. Priority Date: 05/29/1975
  • Status: Expired due to Term
First Claim
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1. In a solid state security system having input circuits adapted to receive input signals from security sensors monitoring two or more alarm conditions and generating a separate digital output signal in response to the occurrence of each alarm condition, the combination of, a digital noise generator circuit means responsive to said digital output signal by initiating a digitally modulated, frequency modulated digital audio waveform uniquely indicative of the alarm condition represented by said digital output signal, each of said digitally modulated, frequency modulated digital audio waveforms conisting of a periodic repetition of a predetermined pattern of frequency versus time waveform segments, and audio means for audibly manifesting said frequency modulated digital audio waveform.

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