Patent ID: 6160757
Filing Date: 2000-12-12
Classification: H04R

Abstract:
A method of providing an acoustic antenna formed from M discrete acoustic transducers having output signals respectively subjected to filters processing g(f)=(g.sub.1 (f), . . . , g.sub.M (f)) wherein the method comprises:a step for maximizing a directivity factor which depends on (1) the modules A(f)-(.alpha..sub.1.sup.H (f).alpha..sub.1 (f) of the signals that are emitted by a near-field source and respectively received by said transducers, and (2) the modules d.sub.2 (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: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:g(f)a.sub.1.sup.H (f)=e.sup.-j2.pi.f.tau.where .tau. is a constant representing a pure delay.