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4.共振式。这是将亥姆霍兹共振器从侧面接到通气管道上,使之对被消减的频率起“滤波”作用,其次还通过共振器的“短管”的摩擦消耗部分声能。实际应用时,一般采取同心圆结构方式,将外管隔出一段作共振腔,在内管的壁上穿数小孔作为共振器的短管。在理想中,共振时声波被完全旁路,消声量应为无限大。但实际上,除了空腔的声容和短管的声质量等抗性成份外,还有阻性成份,因而最大消声量是有限的,特性曲线的峰值下降,使特性曲线顶端呈圆形,同时频带亦有增宽。
Resonance This is done by attaching the Helmholtz resonator sideways to the vent line to “filter” the frequency of the cancellation and, secondly, to dissipate part of the acoustic energy through the friction of the “short tube” of the resonator. Practical application, the general approach to take the concentric structure, the outer tube for a period of isolation for the resonant cavity, the tube wall wear a few holes as short tube resonator. Ideally, the sound wave is completely bypassed at resonance and the amount of sound attenuation should be infinite. However, in fact, in addition to the cavity of the vocal volume and short tube sound quality and other resistance components, there are resistive components, and thus the maximum amount of silence is limited, the peak characteristic curve decreased so that the characteristic curve is rounded at the top, At the same time the band also widened.