Using grating modulation to achieve wideband large area diffusers

JAS Angus - Applied Acoustics, 2000 - Elsevier
Concatenating individual diffusers to form larger ones narrows their diffusion pattern into
specific directions. Solutions are proposed which use modulation of existing diffusion …

Sound diffusers using reactive absorption gratings

JAS Angus - Audio Engineering Society Convention 98, 1995 - aes.org
This paper presents an alternative form of diffusion structure based on absorption reflection
gratings. The theory, design, advantages and limitations of these structures are discussed …

Using modulated phase reflection gratings to achieve specific diffusion characteristics

JA Angus - Audio Engineering Society Convention 99, 1995 - aes.org
A meansof achievinga specificdiffusioncharacteristicisproposedwh… uses modulation of
existing diffusion structures with other sequences to achieve the desired diffusionpattern …

Large-Area Diffusers Using Modulated Phase Reflection Gratings

JAS Angus - Audio Engineering Society Convention 98, 1995 - aes.org
Concatenating individual diffusers to form larger ones narrow their diffusion pattern into
specific directions. A solution is proposed using modulation of existing diffusion structures …

Orthogonal sequence modulated phase reflection gratings for wide-band diffusion

JAS Angus, CI McManmon - Journal of the Audio Engineering Society, 1998 - aes.org
Concatenating individual diffusers to form larger ones narrows their diffusion patterns into
specific directions. A solution is proposed using the modulation of two orthogonaldiffusion …

The effects of specular versus diffuse reflections on the frequency response at the listener

JAS Angus - Audio Engineering Society Convention 106, 1999 - aes.org
This paper shows how the frequency response of the sound from a monitoring loudspeaker
in a control room is affected by the presence of specular or diffuse early reflections. It will first …

A practical metric for evaluating sound diffusers

JAS Angus, AC Marvin, J Clegg, JF Dawson - Audio Engineering Society …, 1995 - aes.org
This paper presents a method of calculating a figure of merit for diffusion structures based on
the integrated ratio of energy scattered at any given angle to the total scattered energy. The …

Controlling early reflections using diffusion

JA Angus - Audio Engineering Society Convention 102, 1997 - aes.org
Current approaches, and the utility of diffusers, in controlling early reflections are reviewed.
Simple theoretical models am used to predict the effect of diffusers on: early reflection …

The Effect of Acoustic Diffusors on Room Mode Decay

JA Angus, AC Marvin, J Clegg, JF Dawson… - … Society Convention 99, 1995 - aes.org
This paper discusseswhat modaldecay is, the effect of diffuserson room mode decay using a
simple theoretical model, and the implications of this model on their bandwidth and decay …

Wideband Two-Dimensional Diffusers Using Orthogonal Modulated Sequences

JAS Angus, A Simpson - Audio Engineering Society Convention 103, 1997 - aes.org
A new method of generating two dimensional diffusers is presented. The new method
modulates two different quadratic residue diffuser sequences, which are mutually …