Acoustic waveguide

Abstract

Provided is an acoustic waveguide. An internal acoustic waveguide tube of the acoustic waveguide includes a binary-tree or ternary-tree multilevel bifurcate waveguide tube. The waveguide tube of each bifurcate structure includes a straight tube and a corner guide tube. The cross section of the acoustic waveguide tube is rectangular, circular, oval or polygonal. The cross-section area of the waveguide tube of each bifurcate structure must be small enough, and the largest-dimension size of the cross section is generally not more than 2cm. The straight tube of the waveguide tube of each bifurcate structure must be long enough, and is generally not shorter than 3cm. For an acoustic waveguide with a wide outlet, the waveguide tube of each bifurcate structure is of a layered structure at the outlet, the number of layers depends on the width of the outlet and the shape of the cross section of the waveguide tube, and the width of each layer is controlled within 2cm.

Description

technical field [0001] The invention relates to an acoustic device, especially a device for high-frequency radiation of a loudspeaker line array. Background technique [0002] The main optimization goal of high-frequency radiation in loudspeaker line arrays is to improve the approximation of the array to the ideal linear line sound source to achieve cylindrical wave radiation, so as to radiate sound energy as far as possible, that is, to improve the "long throw" of the array performance. For this reason, the loudspeaker drivers in the array are usually equipped with acoustic waveguides, which convert the radiation characteristics of the loudspeaker drivers similar to a point sound source to that of a short straight line sound source. By combining these loudspeaker driving units equipped with acoustic waveguides into an array, the radiation characteristic of the array can be approximated as a linear sound source. However, in reality, limited by the installation process and ...

AI Technical Summary

Problems solved by technology

For example, the DOSC acoustic waveguide has a geometric discontinuity at the joint part of its structure from the cone surface to the plane, resulting in discontinuity of the acoustic impedance here. Therefore, when the frequency is high, the sound field distribution is more chaotic, and its performance is greatly reduced.

like figure 2 As shown, the performance of the DOSC acoustic waveguide has dropped significantly at 5kHz

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