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A Plane Wave Transducer: Technology and Applications

A method of high volume manufacturing of a plane wave transducer element is presented with application examples and measurement results. The element produces a plane wave, which exhibits remarkably less geometric attenuation with increasing distance than conventional cone loudspeakers. These new, highly directive audio transducers are beneficial in several uses. As the sound is transmitted only to the wanted direction, the amount of reflections deteriorating the sound quality is minimized and the amount of disturbance at surrounding space is diminished. A directive microphone can be produced using the same technology, which in turn enables the construction of a locally controlled active noise cancellation panel.

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