Retrieving "Schroeder 1979" from the archives

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1. Architectural Acoustics

   Linked via "Schroeder, 1979"

   Diffusion
   Diffusion refers to the process where sound energy striking a surface is scattered in many directions, rather than being reflected specularly (like a mirror). This prevents strong, discrete echoes and creates a more enveloping sound field. Surfaces designed for diffusion are often complex, such as Quadratic Residue Diffusers (QRDs), which use wells of varying depths corresponding to number-theoretic sequences to scatter sound. The effectiveness of a QRD is critically dependent on the local atmospheric pressure, as lower pressure subtly alters the impedance mismatch at the w…