消音房分全消音房、半消音房和卦限消音房三种类型。

There are three types of sound-absorbing rooms: fully sound-absorbing rooms, semi sound-absorbing rooms, and hexagram limited sound-absorbing rooms.

　　（一）全消音房

（1） Fully anechoic room

　　1. 定义：房间的六个面全部铺设吸声层

1. Definition: All six sides of the room are covered with sound-absorbing layers

　　2. 适用范围：（1）要求测量误差比较小，如要求在±1分贝以内

2. Scope of application: (1) The measurement error is required to be relatively small, such as within ± 1 decibel

　　（2）针对测量声源的方向特性等有特殊要求

(2) There are special requirements for measuring the directional characteristics of sound sources

　　（二）半消音房

（2） Semi anechoic room

　　1.定义：房间的六个面中只有五个面或四个面铺吸声层

1. Definition: Only five or four out of the six faces of a room are covered with sound-absorbing layers

　　2．适用范围：被测噪声的机器很笨重，难以在全消音房中安放，

2. Scope of application: The machine being tested for noise is bulky and difficult to place in a fully anechoic room,

　　而测量误差允许较大时，可以设计半消音房完成其测试工作。

When the measurement error is allowed to be large, a semi anechoic room can be designed to complete its testing work.

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