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Hybrid analog and digital comb filter for clutter cancellation

  • US 3,894,219 A
  • Filed: 01/16/1974
  • Issued: 07/08/1975
  • Est. Priority Date: 01/16/1974
  • Status: Expired due to Term
First Claim
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1. A system for cancelling clutter from an analog input signal and producing a digital output signal, comprising:

  • a first summer receiving the analog input signal and producing an output, an analog to digital converter receiving the output of said first summer and producing a corresponding digital output comprising the digital output signal of the system, a filter receiving the digital output of said analog to digital converter and producing as an output a filtered signal having a predetermined mathematical relationship to the output signal of the analog to digital converter, a digital to analog converter receiving the output of said filter and producing as an output an equivalent analog signal wherein, said first summer receives and sums said filtered signal in subtractive relationship with the analog input signal.

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