lec17 - Room acoustics Sound source in a room ¡ intensity...

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Unformatted text preview: Room acoustics Sound source in a room ¡ intensity increases quickly to equilibrium: ¡ switched off then gradual decay ¡ Reverberation time RT ­ intensity ↓ by factor 10 6 ­ sound level ↓ by 60 dB ∑ α = = i i si equil ) S ( A where A P 4 I Sound on-1.0 -0.5 0.0 0.5 1.0 1.5 2 4 6 8 10 Time [s] Intensity -100-80-60-40-20 Sound level [dB] Intensity Sound level Sound on-1.0 -0.5 0.0 0.5 1.0 1.5 2 4 6 8 10 Time [s] Intensity -100-80-60-40-20 Sound level [dB] Intensity Sound level Room acoustics Sabine’s empirical equation for RT RT = 0.163 V/A with A = Σ ( α si S i ) ¡ depends on frequency Room acoustics Good acoustics ¡ low background noise, loud wanted sound ¡ well diffused sound field ¡ no echoes or acoustic distorsions ¡ appropriate RT Room acoustics Good acoustics Geometrical acoustics ¡ avoid large planar surfaces facing each other (fluttering echo) ¡ avoid concave surfaces (focusing) Bad Good Image by MIT OCW....
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This note was uploaded on 12/11/2009 for the course ARCHITECTU 4.401 taught by Professor Marilyneandersen during the Spring '06 term at MIT.

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lec17 - Room acoustics Sound source in a room ¡ intensity...

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