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 Different functional hall requirements indoor reverberation time, due to a variety of materials used in the hall design changes with frequency, so each frequency reverberation time is different. Therefore, the representative frequencies in the audio range of requirements and calculation of the reverberation time is necessary. General choice of 500Hz the reverberation time on behalf of the various rooms of sound characteristics. Here is a different hall reverberation time: 

 (1) hall of the main language 
 Theatre, lecture hall, classrooms, conference rooms, courtrooms, halls are language-based, first of all to ensure the intelligibility of the language to make the audience hear the speaker's intent. Ensure that the requirements of intelligibility: the distance is as short as possible to direct sound to the audience, the volume occupied by each audience to 2.3-4.3 m, the required reverberation time should be 1.0-1.2s. 

 (2) based on electro-acoustic hall 
 Cinema, function rooms, dance halls and other buildings are electric sound of the main hall. Stereo theater reverberation time requirements should be in the 0.6-0.8s, environmental noise control to general control of 35dB (A)-40dB (A), the sound field uniformity is not greater than plus or minus 3dB multi-purpose hall reverberation time of 1.0 s or so. Dance halls, more special, depending on the volume of the room, sound absorption conditions and electro-acoustic devices, are generally in about 0.8s. 


 (3) of the hall to the music-based 
 The Concert Hall is the natural sound of the main hall, which requires the music to play in this, you should have: the intimacy, warmth, active sense of fullness. Reverberation time requirements of a variety of different styles of music, baroque music, the reverberation time of about slightly higher than the 1.0s, classical music and modern music recommended 1.5s, romantic music is slightly higher than the 2.0s to play Minato The music-based and take into account other uses of the hall, the most appropriate reverberation time of about 1.7s; concert hall reverberation time is generally 1.7 --- 2.1s. 

 (4) multi-function hall 
 Hall of such a variety of performances both more difficult to determine the reverberation time, the general control at 1.2-1.4s, and the actual situation, these halls were powered by the electro-acoustic equipment, so the reverberation time should remove limits 1.2 s or so. 
 (5) volume hall 
 Shared space. Restaurant. Shopping centers in the classroom and other public buildings. 
 With large volume, you should pay attention to material selection, control of background reverberation noise 
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