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Method and system for detecting encoded radio signals

  • US 4,783,658 A
  • Filed: 08/11/1986
  • Issued: 11/08/1988
  • Est. Priority Date: 08/12/1985
  • Status: Expired due to Fees
First Claim
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1. An encoded radio signal detecting system comprising:

  • first means for receiving an encoded radio signal and producing an analog signal having a signal amplitude varying with the amplitude of the received signal;

    second means for detecting the amplitudes of a signal component and of a noise component in said analog signal and deriving the difference between the amplitudes of said signal component and said noise component;

    third means for deriving a threshold amplitude based on said difference and outputting a threshold indicative signal; and

    fourth means for comparing said analog signal value with said threshold indicative signal value to detect the presence and absence of said encoded radio signal.

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