B. Sound insulation and vibration isolation measures should have good sound insulation and vibration isolation measures. The sound insulation vibration isolation index shall be implemented according to GB3096-82 “Urban Regional Environmental Noise Standards†in the residential cultural and educational districts: 50dBA in the daytime and 40dBA in the nighttime.
C. Architectural acoustic indicators
1) Resonance, echo, tremor echo, room standing wave, sound focusing, sound diffusion:
The doors, windows, ceilings, glass, seats, decorations and other facilities in the halls shall not have resonance phenomenon; there shall be no defects such as echo, vibrating echo, room standing wave and sound focusing in the hall, and the sound field diffusion shall be uniform.
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