30 June 2023

Treble simulation of empty rectangular rooms with porous absorbers


When a rectangular room is empty and has a porous ceiling absorber, the sound field becomes quasi-two-dimensional. This is because the vertical sound field decays faster than the horizontal sound field due to the absorption. As a result, the porous ceiling absorber cannot reduce the reverberation time effectively at low frequencies. This paper demonstrates how the sound field varies with two different porous layer configurations using both measurements and Treble simulations.

Key findings

  • Why higher absorption coefficients do not guarantee lower reverberation times.
  • How to avoid a highly imbalanced energy decay when improving the acoustics.
  • Are absorption coefficients are good input data for predictions of room acoustics.

This shows that Treble can account for interference by including the phase information. This is delightful news for room acoustic simulation  software users, as not many energy-based GA can do such accurate simulations.
Dr. Cheol-Ho Jeong
Associate Professor, Acoustic Technology

Recent posts

27 September 2023

Live webinar: Treble Success Stories & New Features

Join us for this exclusive webinar where you will hear from some of our customers who have used Treble’s Acoustic Simulation Suite to achieve amazing results in their acoustic design and engineering. Joining us are acoustic experts Bradley Alexander& Ethan Bourdeau, as well as Finnur Pind who will be showcasing the newest features of Treble Acoustic Simulation Suite
19 September 2023

Training Webinar #2

Don’t miss the chance to learn from our CPO, Jesper Pedersen, in a free training webinar on Tuesday 19th of September, at 1.00pm UTC. He will show you how to use Treble Acoustic Simulation Suite effectively for your acoustic projects. You will learn how to import your geometries, compare design iterations in our auralizer, and set source a receiver positions, and much more. You will also have the opportunity to ask questions about Treble.
30 August 2023

Training Webinar - On Demand

Re-watch our recent training webinar in which Jesper Pedersen goes through all the steps involved in the modeling workflow and creating acoustic simulations for in-depth analysis.