room acoustics
DESCRIPTION
Room Acoustics. DHC 161 March 2, 2011. Early sound in a room. concert hall design. Concertgebouw Amsterdam. Boston Symphony Hall. Istanbul, Turkey. Radio Concert Hall, Denmark. Special Rooms. reverberation chamber. anechoic chamber. Standing waves. Chladni plate patterns. - PowerPoint PPT PresentationTRANSCRIPT
Room Acoustics
DHC 161March 2, 2011
Early sound in a room
concert hall design
Boston Symphony Hall
Concertgebouw Amsterdam
Istanbul, Turkey Radio Concert Hall, Denmark
reverberationchamber
anechoicchamber
Special Rooms
Standing waves
Chladni plate patterns
Practice calculation
3.2 m
12.5 m
speed of sound is 342 m/s
horizontal modesvertical modes
fundamental
€
c2L
=342 m/s6.4 m
= 53.4 Hz
€
c2L
=342 m/s
25 m=13.7 Hz
we know that boundaries are fixed-fixedstanding waves in a room
2nd harmonic
3rd harmonic
106 Hz
159 Hz
212 Hz4th harmonic
27.4 Hz
41.1 Hz
54.8 Hz
nth harmonic n*53.4 n*13.7
These frequencies will be amplified by the room