Such classroom teaching is usually found in old buildings, as poor acoustics, listening clarity weak, 
 Become the focus of teachers complaining. This is only the University of the classroom, there are many primary and secondary school classrooms is 
 This design, and more obsolete. Some rooms with tall ceilings and many tall plaster windows. 
 As first built, did not install central air conditioning, so they joined several groups of noisy window air conditioners. 
 In order to improve the room's acoustic environment, measurements of several sets of data - the window air-conditioning caused by noise and reverberation time. 
 Does not affect the overall beauty of the room in the case, to improve the acoustic environment is very important. 
 The ceiling is high and the lack of sound-absorbing material, the reverberation time frequency sound up to 1.5 seconds. Adding a layer of acoustic suspension 
 House roof will greatly improve the acoustic environment, but will not have much visual impact. To avoid prejudice to the height of the window, 
 Ceiling panels must be inclined at the side, a new roof may not be built the original building and classroom harmony. On the contrary, 
 2-inch thick glass fiber fabric surface with the house color match. High fiber and other lighting.