Acoustics

This chapter introduces the basics acoustics, like interference and reverberation Interference Reverberation YouTube: Architectural Acoustics: Sound and Building Materials Sound Absorption and Noise Reduction Ray Tracing and Sound Reflection Sound Moving in Room Criteria in Acoustical Design Liveliness Intimacy Fullness Clarity Warmth Brilliance Texture Blend Ensemble Elbphilarmonie Hamburg, a visually stunning concert hall has perfect acoustics. Acoustics of a lecture hall Sound absorption coefficients: 125 Hz 500 Hz 2,000 Hz Acoustic Panel (example) 0.16 0.50 0.80 Unpainted Brick** (18" thick wall) 0.02 0.03 0.05 Painted Brick** (18" thick wall) 0.01 0.02 0.02 Light Draperies 0.04 0.11 0.30 Heavy Draperies 0.10 0.50 0.82 Wood Floor 0.06 0.06 0.06 Carpeted Floor 0.11 0.37 0.27 Concrete Floor 0.01 0.02 0.02 Plaster 0.04 0.05 0.05 Wood Panel (pine) 0.10 0.10 0.10 Insulated Wood (rock) 0.35 0.63 0.83 Glass 0.04 0.05 0.05 *These values and table are taken from L.E. Kinsler & A.R. Frey, Fundamentals of Acoustics, 2nd edition (New York: John Wiley & Sons, Inc., 1962), p. 435. The few exceptions are noted. (Reproduced with permission). **L.L. Beranek. Acoustics (New York: McGraw-Hill Book Co., 1954), pp. 300-301. This reference has a rather complete list of absorption coefficients. Problems in Acoustical Design Several important acoustical problems must be avoided in the design of auditoriums and other rooms. Many of these problems result from improper architectural designs. The following are some of the more serious ones. Focusing of sound Echoes Shadows Resonances External noise

Ch. Elster
Aug 26 14:27:03 EDT 2019