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1）膨胀形（见图1、a） 这是扩大声波而使声响能量密度稀薄化,通过空腔端节流使之消声的方式。它大致分为集中常数式（做为空洞和尾管的mc回路的整流方式）和分布定数式（在空腔进行波的干涉方式）两种。
1) Expansion (see Figure 1, a) This is a way to amplify the sound wave to thin the acoustic energy density and to dampen it through the end of the cavity. It is roughly divided into two types of concentration constant (rectification method of mc circuit as cavity and tail pipe) and distribution fixed number (interference of wave in cavity).