acoustics of concert halls and rooms some basics of architectural acoustics
DESCRIPTION
Acoustics of Concert Halls and Rooms SOME BASICS OF ARCHITECTURAL ACOUSTICS. Auditorium Acoustics Handbook of Acoustics ,Chapter 23 Principles of Vibration and Sound , Chapter 11. Kimmel Center. p vs r. log p vs log r. SOUND FIELD. Free field. Reflections. Sound decay. - PowerPoint PPT PresentationTRANSCRIPT
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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