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Antenna formed of a plurality of acoustic pick-ups

  • US 6,160,757 A
  • Filed: 08/20/1998
  • Issued: 12/12/2000
  • Est. Priority Date: 09/10/1997
  • Status: Expired due to Term
First Claim
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1. A method of providing an acoustic antenna formed from M discrete acoustic transducers having output signals respectively subjected to filters processing g(f)=(g1 (f), . . . , gM (f)) wherein the method comprises:

  • a step for maximizing a directivity factor which depends on (1) the modules A(f)-(α

    1H (f)α

    1 (f) of the signals that are emitted by a near-field source and respectively received by said transducers, and (2) the modules d2 (f) of signals that are emitted by a perturbing source and respectively received by said transducers, said directivity factor being given by;

    ##EQU25## where A(f) is a matrix equal to;

    
    
    space="preserve" listing-type="equation">A(f)=a.sub.1.sup.H (f)a.sub.1 (f)and, where D(f) is equal to;

    ##EQU26## said maximizing step comprising a linear unit gain for the signal emitted by the near field source given by the following relation;

    
    
    space="preserve" listing-type="equation">g(f)a.sub.1.sup.H (f)=e.sup.-j2π



    where τ

    is a constant representing a pure delay.

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