Signature filter system

  • US 4,944,036 A
  • Filed: 08/10/1987
  • Issued: 07/24/1990
  • Est. Priority Date: 12/28/1970
  • Status: Expired due to Term
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First Claim
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1. An acoustic filtering system comprising:

  • a plurality of signature signal generators being spaced apart, each signature signal generator generating an overlapping signature signal that is overlapping the signature signal generated by at least one of the other spaced apart signature signal generators, each signature signal having a signature that is different from the signature of the signature signal of each of the other spaced apart signature signal generators for propagating through a propagation medium anda signature signal processor being spaced apart from each of said plurality of signature signal generators and generating output signal samples in response to the overlapping signature signals propagating through said propagation medium from said plurality of signature signal generators, said signature signal processor including(a) a receiver generating single bit resolution input signature signal samples in response to the overlapping signature signals propagating through said propagation medium from said plurality of signature signal generators,(b) a plurality of single bit resolution reference signal generators each corresponding to a different one of said signature signal generators in said plurality of signature signal generators and each generating single bit resolution reference signal samples having a signature that is different from the signature of the single bit resolution reference signal samples generated by each of the other reference signal generators and each having a signature that is the same as the signature of the overlapping signature signal generated by the corresponding one of said plurality of signature signal generators, and(c) a plurality of single bit resolution filter processors each corresponding to and coupled to a different one of said single bit resolution reference signal generators in said plurality of single bit resolution reference signal generators and each coupled to said receiver and each generating output signal samples by filter processing the single bit resolution input signature signal samples in response to the single bit resolution reference signal samples generated by the corresponding one of the reference signal generators.

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