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Acoustics of Concert Halls and Rooms
SOME BASICS OF
ARCHITECTURAL ACOUSTICS
Auditorium Acoustics
Science of Sound, Chapter 23
Principles of Vibration and Sound,
Chapter 11
Kimmel Center
Free field
Reflections
p vs r log p vs log r
SOUND FIELD
Sound decay
Sound decay in a
400 m3 classroom
Sound pressure level as a
function of time for that room
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 )
Decay of reverberant sound
(a) and (b) are decay curves of sound pressure and sound
level in a room with uniform energy distribution
(c) shows different initial and final reverberation times
(d) shows peaks due to prominent standing waves or room
resonances
CALCULATING REVERBERATION TIME
CALCULATING REVERBERATION TIME
Desirable
reverberation times
for various sizes and
functions
Variation of
reverberation time
with frequency in
good halls
McDermott
Concert
Hall
(Dallas)
Orchestra
Hall
(Chicago)
Meyerhof
Symphony
Hall
(Baltimore)
Walt Disney Concert Hall
Disney
Kimmel
Center
Auditorium
BACKGROUND NOISE CRITERIA
•Spatial impression
•Intimacy
•Early decay time
•Clarity
•“Warmth”
Important criteria for
concert halls:
Concert
halls
throughout
the
World

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1 auditorium acoustics