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Acoustics of Concert Halls and Rooms SOME BASICS OF ARCHITECTURAL ACOUSTICS

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. p vs r. log p vs log r. SOUND FIELD. Free field. Reflections. Sound decay.

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Acoustics of Concert Halls and Rooms SOME BASICS OF ARCHITECTURAL ACOUSTICS

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  1. Acoustics of Concert Halls and RoomsSOME BASICS OF ARCHITECTURAL ACOUSTICS Auditorium Acoustics Science of Sound, Chapter 23 Principles of Vibration and Sound, Chapter 11 Kimmel Center

  2. p vs r log p vs log r SOUND FIELD Free field Reflections

  3. Sound decay Sound decay in a 400 m3 classroom Sound pressure level as a function of time for that room

  4. 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 )

  5. Decay of reverberant sound • 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

  6. CALCULATING REVERBERATION TIME

  7. CALCULATINGREVERBERATION TIME

  8. Desirable reverberation times for various sizes and functions Variation of reverberation time with frequency in good halls

  9. McDermottConcertHall(Dallas)

  10. Orchestra Hall(Chicago)

  11. MeyerhofSymphonyHall(Baltimore)

  12. Walt Disney Concert Hall

  13. Disney

  14. Kimmel Center Auditorium

  15. BACKGROUND NOISE CRITERIA

  16. Important criteria for concert halls: • Spatial impression • Intimacy • Early decay time • Clarity • “Warmth”

  17. Concerthallsthroughoutthe World

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