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 , 2 nd 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
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