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an acoustic anechoic chamber has mainly 3 features

stopping sound getting in; stopping sound getting out; reduce echoey.

Is there a term to describe a room only used to stop sound getting in?

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  • $\begingroup$ I'm not aware of any material that allows sound to travel in a preferred orientation. Materials tend to transmit, attenuate, absorb or reflect sound uniformly. I'm unaware of a material or fabrication method that would allow sound out of a room but prevent it from entering a room. Surface textures (ripples & ridges) may preferentially reflect sound thus limiting the capacity to transmit sound. $\endgroup$
    – Fred
    Feb 3 '20 at 6:12
  • $\begingroup$ Anechoic chamber works - you just define in which direction is the reason it is being used. $\endgroup$
    – Solar Mike
    Feb 3 '20 at 8:10
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Acoustic test booth

However, acoustic tests require special spaces. They should be conducted in a place where the sounds can be isolated and any unwanted noises are kept outside. This is where acoustic test booths come in.

https://www.enoisecontrol.com/acoustic-test-booth-chamber/

Specifically, a hemi-anechoic chamber has some sound-reflective inside surfaces, typically the floor, in order to simulate operating conditions.

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