Encoding surfaces as binary absorber-reflector strips produces sound diffusion

Evidence

Thus amplitude reflection gratings consist of a surface treatment that consists of strips of absorbing material whose width is less than λ 2 at the highest frequency of use, laid out in a pattern in which strips of absorber represent zero and strips of reflecting wall represent 1 (see Figure 6.51). Note that because we are not depending on depth, we do not have a low-frequency limit to the range of diffusion, only a high-frequency limit, which is a function of the width of the strips. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2105

Categorization

• DEFINE: Defines the amplitude reflection grating: strips of absorber coded as zero, reflecting wall as one.
• XREF: Connects to the phase reflection grating material likely covered just before this chapter’s numbers, contrasting depth-based versus strip-based diffusion.