In an effort to provide full spectrum sound diffusion in a single integrated diffusor, the self similarity property of fractals was combined with the uniform scattering property of the number theoretic reflection phase grating to produce the Diffractal®, a patented diffusing fractal.
Problem
The bandwidth of a QRD® is limited at high frequencies by the well width and at low frequencies by the maximum depth. Additionally, wide area coverage with periodic arrays focuses energy into certain diffraction directions. A full spectrum diffusor offering wide area coverage is needed.
The Diffractal® is the first diffusing fractal. It consists of nested self similar scaled diffusors, each of which covers a specific frequency range and offers wide area coverage without lobing effects. A second generation Diffractal® (DFR72) contains two nested QRD®s, thus forming a diffusor within a diffusor. Each diffusor provides uniform scattering over a specific range of frequencies so that the effective bandwidth is extended. The DFR72 can be nested within a larger low frequency diffusor to provide wide area coverage, extended low frequency diffusivity, and also minimum lobing associated with periodic arrays. This third generation Diffractal® (DFR73) offers low, mid, and high frequency diffusion over an extended bandwidth, limited only by the depth available.