noise roomNoise room (noise room) is to simulate the free field space indoors, so the sound absorption coefficient of each surface in the room is required to be above 99%. 
No sound roomNo sound room
listening roomlistening room
Air sound insulation room
Full anechoic chamber (Full silence chamber)Precision full silence chamber 
anechoic chamber(anechoic room )anechoic chamber(anechoic room )
Acoustic laboratoryAcoustic laboratory (soundproof room)
