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Communications systems

  • US 4,672,674 A
  • Filed: 01/27/1983
  • Issued: 06/09/1987
  • Est. Priority Date: 01/27/1982
  • Status: Expired due to Term
First Claim
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1. Apparatus for improving the signal to noise ratio of a communication system, comprising(a) a first microphone having a first field of response for receiving speech signals in a first near field, said first microphone having a poor response to signals in the far field beyond said first field;

  • (b) at least one second microphone arranged adjacent said first microphone and having a second field of response different from said first field of response for receiving signals other than said speech signals in a second near field, said second microphone having a poor response to signals in the far field beyond said second field;

    (c) sampling means connected with said first and second microphones for sampling the speech and other signals at constant discrete intervals of time, the speech signals representing information and noise and the other signals representing noise; and

    (d) processing means connected with said sampling means for processing a plurality of sampled signals in batches of N-2n where n is an integer, said processing means producing an output signal having an enhanced signal to noise ratio.

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