Acoustic lens system for loudspeakers

Abstract

An acoustic lens may improve the directional audio performance of a loudspeaker. Application of the improved directional audio performance to a sound system in a listening area may improve the performance of the audio system. The acoustic lens (or phase plug) may be acoustically opaque and partially fill the cavity formed by the loudspeaker cone. The acoustic lens may provide an improved frequency response and directivity. The improved loudspeaker may provide an improved listening location, for example, in a vehicle, a room or a concert hall.

Description

technical field [0001] Aspects disclosed herein relate generally to acoustic lenses, and more particularly, to speakers having an acoustic lens that can direct acoustic emissions from the speaker. Background technique [0002] The midrange in many speakers can suffer from timbre defects in the acoustic output at the end of the midrange bandwidth. The timbre defects may include peaks and valleys that may be caused by interference (constructive or destructive) of sound radiation from different regions of the diaphragm spatially originating. The peaks and valleys may also originate from Helmholtz cavity resonances formed by the conical diaphragm itself. Although in loudspeaker systems midrange transducer operation is usually band-limited at frequencies that limit low-pass filters to operate below frequencies at which peaks and valleys manifest themselves, such filters must be The tapered shape attenuates the midrange SPL by 6-24dB SPL / octave. As a result, mid-range timbre de...

AI Technical Summary

Problems solved by technology

Often, different characteristics of off-axis performance cannot be corrected electronically

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