Acoustics of Concert Halls and Rooms SOME BASICS OF ARCHITECTURAL ACOUSTICS
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Acoustics of Concert Halls and Rooms
SOME BASICS OF ARCHITECTURAL ACOUSTICS
Auditorium Acoustics
Handbook of Acoustics,Chapter 23Principles of Vibration and Sound,
Chapter 11Kimmel Center
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Free field
Reflections
p vs r log p vs log r
SOUND FIELD
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Sound decay
Sound decay in a400 m3 classroom
Sound pressure level as a function of time for that room
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GROWTH AND DECAY OF REVERBERANT SOUND
RT = K (volume / area)RT = 0.161 V/A (V in m3; A in m2 )If room dimensions are given in feet, the formula may be written:RT= 0.049 V/A (V in ft.3 ; A in ft.2 )
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Decay of reverberant sound
(a) and (b) are decay curves of sound pressure and soundlevel in a room with uniform energy distribution(c) shows different initial and final reverberation times(d) shows peaks due to prominent standing waves or roomresonances
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CALCULATING REVERBERATION TIME
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CALCULATING REVERBERATION TIME
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Desirable reverberation times
for various sizes and functions
Variation of reverberation time with frequency in
good halls
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McDermottConcert
Hall(Dallas)
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Orchestra Hall
(Chicago)
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MeyerhofSymphony
Hall(Baltimore)
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Walt Disney Concert Hall
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Disney
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Bing Concert Hall
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BACKGROUND NOISE CRITERIA
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• Spatial impression• Intimacy• Early decay time• Clarity• “Warmth”
Important criteria for concert halls:
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Concerthalls
throughoutthe
World