Reliability test

We are often asked the question: “Where can I find documentation that ODEON is a reliable software?” This question does not have one simple answer.

 

International Round Robins

It is now quite some time ago that the “Round Robins” on room acoustics software were carried out. In the three Round Robins, ODEON was ranked as one of the “unquestionable reliable” software. Since the last 3rd Round Robin in 2002 ODEON has continuously improved, e.g. the reflection based scattering and  diffraction around edges have been built in. These developments allow to obtain reliable results, as they remove some of the guessing involved in the room acoustic modelling by adding algorithms that automatically utilize the geometry of the room model to generate scattering or diffraction.

 

Danish small Round Robin

Additionally, in 2008, the Danish Acoustical Society made a small Round Robin using only ODEON as software and 8 different users. The conclusion was that guessing extremely low or extremely high absorption coefficient values can be problematic in an acoustic model; where this actually is no problem if the acoustician uses a traditional Sabine calculation assuming a totally diffuse field. 

Claus Lynge Christensen, Gry Bælum Nielsen, Jens Holger Rindel. Danish Acoustical Society Round Robin on room acoustic computer modelling, 2008.

With the experience from Danish investigation we added a new button in the Material list called “limit absorption coefficients”. This button makes sure that all absorption coefficients added to the room model is automatically adjusted to be in between 0.05 and 0.95. Our advise is that you use this button if you are not sure whether the absorption coefficients are really that low or high. Especially in cases with one or two dimensional modes describing the reverberation time, this limiting of absorption coefficient may be necessary. Furthermore you should always make a quality check of your model e.g. using the checklist below.

Check your ODEON model

 

Make your own judgment

But to come back to the question of reliability we recommend that you test ODEON by yourself. Make your own test of the software e.g. in the free demo version. Open the rooms that all ready contains measurements in the free demo version. Look at how the simulation fits with the measured values in the multipoint response. Then go to the room setup and change the setup e.g. the number of rays used in the model and investigate what influence this has on the result, as shown in the video below. You can try different stability tests like this and please ask if you have any questions