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