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Acoustic communication system

  • US 5,661,699 A
  • Filed: 02/13/1996
  • Issued: 08/26/1997
  • Est. Priority Date: 02/13/1996
  • Status: Expired due to Fees
First Claim
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1. An acoustic communication system, comprising:

  • a voice processing circuit which transforms a voice message into a first signal;

    a noise sensor channel which generates a second signal in response to detecting background noise in an environment;

    a microcomputer which receives said first and second signals, and provides a third signal to an m number of n output ports, where m and n are integers, 0≦

    m≦

    n, and n≧

    2, said third signal having amplitude characteristics functionally related to said second signal;

    an ultrasonic output channel coupled to a first one of said output ports and which generates an ultrasonic output signal representing said voice message in response to receiving said third signal; and

    a pubic address channel coupled to a second one of said output ports which generates an audible signal representing said voice message in response to receiving said third signal.

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