Patent ID: 9275629
Filing Date: 2016-03-01
CPC Classification: B63B,G10K

Claim Text:
1. An acoustic projector with an operating frequency having a minimum wavelength under operating conditions, comprising: an enclosure formed from a substantially acoustically-impervious exterior wall, wherein the exterior wall defines an acoustically transparent aperture smaller than one-third the minimum wavelength; an array of acoustic transducers within the enclosure; a drive circuit for driving each acoustic transducer in the array with a respective drive signal; and a controller to determine the respective drive signals, wherein the controller includes a calibration routine which, when executed, determines a mutual impedance matrix that characterizes the mutual coupling among the acoustic transducers, solves an eigenvalue problem of the mutual impedance matrix to identify a set of eigenvalues, selects one of the eigenvalues that maximizes an expression for radiated power, and determines the respective driving signals from the selected one of the eigenvalues.