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Published byLawrence Richards Modified about 1 year ago

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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

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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 a 400 m 3 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 m 3 ; A in m 2 ) 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 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

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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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McDermott Concert Hall (Dallas)

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Orchestra Hall (Chicago)

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Meyerhof Symphony Hall (Baltimore)

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Walt Disney Concert Hall

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Disney

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Kimmel Center Auditorium

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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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Concert halls throughout the World

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