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