Patent ID: 6836243
Filing Date: 2004-12-28
Classification: G01S,H03H,H04B

Abstract:
A system for processing a signal being emitted from a target signal source (20) into a noisy environment wherein said target signal source (20) is located in a target signal source direction &phgr;s with regard to the position of a transducer array (10); the system comprising:the transducer array (10) having M transducers for receiving said signal being mixed with noise, each of the transducers generating a corresponding transducer output signal, respectively; a beamformer (30I, 30II) for receiving and filtering said M transducer output signals in order to generate at least one output signal yâ€²1(n) i=1 . . . N, said beamformer (30I, 30II) comprising adjustable filter coefficients defining a predetermined filtering characteristic; a beamformer beam shape control system (40) providing a control signal Di(n) representing at least one physically relevant parameter for said target signal source (20); and a beamformer filtering characteristic adjusting means (30Ib, 30IIb) operating in response to said control signal Di(n) such that the beamformer (30I, 30II) has a predetermined filtering characteristic; characterized in that said adjustable filter coefficients are defined by the following equation: hj,k&it;â€ƒ&it;(Di)=&Sum;t=0T&it;â€ƒ&it;at&it;â€ƒ&it;(j,k)&it;â€ƒ&it;Ft&it;â€ƒ&it;(Di),wherein the at(j,k) are fixed filter parameters, wherein Di is a vector of variable filter parameters representing said control signal Di(n); and wherein the Ft(Di) are functions of said Di.