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Wireless audible indication system with low power signal processing

  • US 5,568,122 A
  • Filed: 10/21/1994
  • Issued: 10/22/1996
  • Est. Priority Date: 10/21/1994
  • Status: Expired due to Fees
First Claim
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1. A receiver for use in an audible indication system with a corresponding transmitter capable of transmitting a radio frequency signal, the receiver comprising:

  • a radio frequency detector which produces a first intermediate signal upon receiving the radio frequency signal from the corresponding transmitter;

    a signal processing circuit, coupled to the radio frequency detector, which produces a second intermediate signal in dependence upon the first intermediate signal, the signal processing circuit having a series of one or more cascaded stages which includes a peak detector stage; and

    a sound generator, coupled to the signal processing circuit, which generates an audible indication in dependence upon the second intermediate signal;

    wherein the peak detector stage includes a transistor having an emitter, a collector, and a base, wherein the emitter is coupled to a first supply voltage by a parallel combination of a resistor and a capacitor, wherein the collector is coupled to a second supply voltage, and wherein the peak detector stage is operative to peak detect a signal applied at the base to produce a peak detected signal at the emitter.

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