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Signal processing apparatus

  • US 5,490,505 A
  • Filed: 10/06/1993
  • Issued: 02/13/1996
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Term
First Claim
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1. In combination:

  • a detector responsive to a first signal which travels along a first propagation path and a second signal which travels along a second propagation path, to provide a representation of said first and said second signals on an output, a portion of said first and second propagation paths being located in the same propagation medium, wherein said representation of said first signal on said output has a primary signal portion and a secondary signal portion, said primary signal portion of said first signal being subject to attenuation along substantially the entire first propagation path and wherein said representation of said second signal on said output has a primary signal portion and a secondary signal portion, said primary signal portion of said second signal being subject to attenuation along substantially the entire second propagation path; and

    a first signal processor having inputs coupled to said detector, said first signal processor responsive to said representation of said first and second signals from said detector to combine said first and second signals to generate either a primary or secondary reference signal which is a function significantly of either of, respectively, said primary or said secondary signal portions of said first and second signals.

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