An Investigation of the Air Chamber of Horn Type Loudspeakers
An Investigation of the Air Chamber of Horn Type Loudspeakers
复制标题
号角式扬声器气室的研究
DOI：
10.1121/1.1917553
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发表时间：
1953
影响因子：
2.4
通讯作者：
Bob H. Smith
中科院分区：
文献类型：
--
作者：
Bob H. Smith
将气室视为一个边值问题，求解一般情况下喇叭喉部以任意周对称方式进入气室时的波动方程。分析了以下几种具体情况：(1)喇叭喉口通过单孔进入气室；(2)喇叭喉口通过半径为r、宽度为w的单环进入气室；(3)喇叭喉口以半径为r1⋯Rm、宽度为W1⋯Wm的“m”形环进入气室。分析表明，喇叭喉部引起的径向扰动激发了高阶模式。在这些模式的共振频率下，喇叭喉部压力变为零，扬声器不会辐射。通过适当地选择环形半径和宽度，可以抑制前m个模式，并消除输出压力中相应的零点。
The air chamber is treated as a boundary value problem which results in the solution of the wave equation for the general case in which the horn throat enters the air chamber in any circumferentially symmetrical manner. The following specific cases are analyzed: (1) the case in which the horn throat enters the air chamber by means of a single orifice, (2) the horn throat enters the air chamber by means of a single annulus of radius r and width w, and (3) the horn throat enters the air chamber in “m” annuluses of radii r1⋯rm and widths w1⋯wm. The analysis reveals that the radial perturbation caused by the horn throat excites higher order modes. At the resonant frequencies of these modes the horn throat pressure becomes zero and the loudspeaker does not radiate. By suitable choice of annulus radii and widths the first “m” modes may be suppressed and the corresponding nulls in the output pressure eliminated.