This is going to be a bit of a dive into acoustic diffusion, so fasten your nerd spectacles with enough duct tape, Let's go to acoustic space!
I'd like to present diffusion from the point of product photography to give a visual reference point of what diffusion and reflections are, so it can be a bit easier to understand the concepts. Photos 1-4 are from the book Light - Science and magic, An introduction to photographic lighting, 4th edition, pages 35-37 (F. Hunter, S. Biver, P. Fuqua, published by Elsevier inc. 2012)
The Phase and amplitude balloon graphs of an acoustic diffuser (phase grating panel), measured with the proposed ASTM New Diffusion Standard @ 8.5kHz show the same effect as diffusing material (white paper/phase balloon) and specular reflection (plastic handles of the soldering iron & pliers, all metal parts/ amplitude balloon)
This is the measured panel on the balloon graphs above. Being a flat panel, it produces a specular reflection but the holes affect the phase change ie. light reflecting off of a white paper.
Several measured diffusers, the .GLL files and GLLViewer can be downloaded from NWAA Labs https://www.nwaalabs.com/Index Surface Reflectors (Diffusers).html
This article explains the flaws of measuring acoustic diffusion and trying to depict the phenomena with a scattering coefficient on a simple graph with the current standard:
October 9, 2022
The Misunderstanding of Acoustic Diffusion Test Data
Where we've been, where we are and where we're going
Richard L. Lenz, RealAcoustix LLC.
https://realacoustix.com/news/news-full-article/tmp-1
Matthew Poes of Poes Acoustics has a ~5min part in his video from this topic
This mammoth of a video goes deeper into this topic, with explanations and measurements straight from physicist/acoustician Ron Sauro (NWAA Labs) and acoustic designer John Brandt, hosted by Karthik Ramanathan. Timestamp starts from the similar phase grating panel pictured above and continues to a show examples of diffraction modules.
Didn't find much conversation about these topics so I hope this helps and opens up some discussion about the possibilities these new measuring methods can provide to modifying our acoustic spaces, but also how these may be utilised in speaker design. And please do correct me if I'm way off on something, I'm only a novice on acoustics and as english is not my native language there is a bit of a language barrier.
I'd like to present diffusion from the point of product photography to give a visual reference point of what diffusion and reflections are, so it can be a bit easier to understand the concepts. Photos 1-4 are from the book Light - Science and magic, An introduction to photographic lighting, 4th edition, pages 35-37 (F. Hunter, S. Biver, P. Fuqua, published by Elsevier inc. 2012)
The Phase and amplitude balloon graphs of an acoustic diffuser (phase grating panel), measured with the proposed ASTM New Diffusion Standard @ 8.5kHz show the same effect as diffusing material (white paper/phase balloon) and specular reflection (plastic handles of the soldering iron & pliers, all metal parts/ amplitude balloon)
This is the measured panel on the balloon graphs above. Being a flat panel, it produces a specular reflection but the holes affect the phase change ie. light reflecting off of a white paper.
Several measured diffusers, the .GLL files and GLLViewer can be downloaded from NWAA Labs https://www.nwaalabs.com/Index Surface Reflectors (Diffusers).html
This article explains the flaws of measuring acoustic diffusion and trying to depict the phenomena with a scattering coefficient on a simple graph with the current standard:
October 9, 2022
The Misunderstanding of Acoustic Diffusion Test Data
Where we've been, where we are and where we're going
Richard L. Lenz, RealAcoustix LLC.
https://realacoustix.com/news/news-full-article/tmp-1
Matthew Poes of Poes Acoustics has a ~5min part in his video from this topic
This mammoth of a video goes deeper into this topic, with explanations and measurements straight from physicist/acoustician Ron Sauro (NWAA Labs) and acoustic designer John Brandt, hosted by Karthik Ramanathan. Timestamp starts from the similar phase grating panel pictured above and continues to a show examples of diffraction modules.
Didn't find much conversation about these topics so I hope this helps and opens up some discussion about the possibilities these new measuring methods can provide to modifying our acoustic spaces, but also how these may be utilised in speaker design. And please do correct me if I'm way off on something, I'm only a novice on acoustics and as english is not my native language there is a bit of a language barrier.
You know, sound and light both travel in/through waves, but are completely different: one travels at the speed of light, the other goes sloooow - 344m/s at sea level, Mach 1
Yes, the point of using light as an example is just a visual reference of the concept. Many of their properties are described with identical terms eg. reflection, coloration, refraction, diffraction etc.