Page 12 - Master Handbook of Acoustics
P. 12

Carpet Absorption Coefficients
       Sound Absorption by People

       Sound Absorption in Air
       Panel (Diaphragmatic) Absorbers
       Polycylindrical Absorbers

               Poly Construction
       Bass Traps: Low-Frequency Absorption by Resonance
       Helmholtz (Volume) Resonators

       Perforated Panel Absorbers
       Slat Absorbers
       Placement of Materials

       Reverberation Time of Helmholtz Resonators
               Reducing Room Modes with Absorbers
       Increasing Reverberation Time

       Absorption Module Design


  13   Modal Resonances
       Early Experiments and Examples
       Resonance in a Pipe

       Indoor Reflections
       Two-Wall Resonance

       Frequency Regions
       Room-Mode Equation
               Mode Calculations—An Example
               Experimental Verification

       Mode Decay
       Mode Bandwidth

       Mode Pressure Plots
       Mode Density
       Mode Spacing and Timbral Defects

               Audibility of Timbral Defects
       Optimal Room Proportions
               Bonello Criterion

       Splaying Room Surfaces
               Nonrectangular Rooms
       Controlling Problem Modes

       Simplified Axial-Mode Analysis
       Summary


  14   Schroeder Diffusers

       Experimentation
       Reflection Phase-Grating Diffusers
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