| 摘要 |
<p>A plane-shaped transducer body for detecting an acoustic signal in the presence of noise, the transducer body comprising an array of transducer elements having a non-uniform spatial filter response across its working aperture to attenuate the response to noise lying outside the spatial spectrum of a wave to be detected by the elements, with primary elements (2) mainly for detecting the required acoustic signal and secondary elements (3, 4) mainly for sensing noise in the signal, the elements (2, 3, 4) being spaced apart from one another over the area of the body (1) in a linear arangement such that the body will act as a rejector of noise pressure waves incident from a given direction (6) but as a receptor to signals or noise from an alternative direction (7).</p> |
