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Smart noise generator

  • US 4,247,946 A
  • Filed: 12/19/1979
  • Issued: 01/27/1981
  • Est. Priority Date: 12/19/1979
  • Status: Expired due to Term
First Claim
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1. A system for generating a relatively long duration output RF signal at the same frequency as a received relatively short duration input Rf signal having a leading edge and lasting at least until time T thereafter, comprising in combination:

  • first means responsive to said input signal for generating a first output signal of amplitude corresponding to the frequency of said input RF signal;

    second means responsive to said first means first output signal for producing a first output signal corresponding to the amplitude of said first means first output signal until a time t after receipt by said first means of said input RF signal leading edge and for thereafter producing a second output signal corresponding to the amplitude of said first means first output signal at time t, where t≦

    T;

    third means responsive to said first and second signals produced by said second means for producing said output RF signal, the frequency of which is ideally identical to the frequency of said input RF signal but, due to system tolerance, is usually not identical thereto;

    fourth means responsive to said output RF signal from said third means after time, t, for applying said output frequency signal, rather than said input frequency signal, to said first means for causing it to produce a second output signal the amplitude of which corresponds to the frequency of said output RF signal; and

    error correcting means responsive to first means second output signal and second means second output signal for producing a difference signal and wherein said third means is responsive to said difference signal for correcting the frequency of said output RF signal to the frequency of said input RF signal.

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