CATT-Acoustic is one of the leading programs for room acoustic prediction and auralisation, and indeed is becoming an industry standard for room acoustics consultants, researchers and sound system designers worldwide. CATT was based on Bengt-Inge Dalenback’s room acoustics research PhD at Chalmers University in Sweden. Since completing his doctorate, Bengt-Inge worked full-time developing and selling CATT and other acoustic programmes commercially. This has the great advantage for users that they are dealing with a dedicated individual rather than with a university department or with a large company, who may treat their software sales and support as an incidental occupation. Bengt-Inge has a real incentive to make sure that people want to buy CATT and to keep using it. To do that he has to make sure that CATT stays at the forefront of the technology.
As CATT was based on Bengt-Inge Dalenback’s research PhD it was assessed by some of the world’s leading academics in room acoustics, and it is therefore academically and technically very sound. In particular, Bengt-Inge was very keen to develop robust and accurate ways of modelling room diffusion, which has a huge effect on the accuracy of the modelling process but which was largely ignored by other programs at the time. Some of the others are now realising this but CATT is still leading the field in this respect. Part of the reason for this is that most of the other programs were based on simple loudspeaker coverage modelling programs with room acoustics bolted on as an optional extra. This is not how acoustics works and in general, if you don't model the room reflections properly, you won't get correct results. CATT takes the approach that if you get the room acoustics model right, you can then model any source that you like in that room. You can read about some of the technical aspects of CATT and its applications in the following paper :
The following papers refer to much older versions of CATT-Acoustic which have been superseded by recent developments in CATT-Acoustic and TUCT, but provide useful background on some of the principles and applications of geometrical acoustic modelling :