Slim design has emerged recently as a new form factor for the speaker system of an electronic device. However, this form factor is disadvantageous to sound performance because of the narrow space for a speaker unit. In this paper, to overcome this drawback, we designed Slit-Firing Sound Plate, which is a slim speaker system using diffraction through a slit, and developed a slim elliptical speaker that is optimized for the boundary conditions for the slit. After building and tuning a prototype, the sound performance of the prototype was assessed by measuring and examining frequency response, transient response, and directivity beam pattern. As a result, proposed novel design shows high performance that makes it suitable for the application of slim electronic devices.
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