CATT-Acoustic

           

CATT-Acoustic v.8.0g (June 2007) Vista compatible for Windows^TM is now shipping. If you are interested in a hands-on experience, then download the demo from www.catt.se . A four-page color brochure in USA page size is available here to download in PDF form (597K).

Here are some features of the CATT program:

New Stuff: Semi-transparent surfaces, such as curtains, can be specified using both absorption and transmission coefficients; CATT-Walker, a quick and easy walk-through convolver now including visualization of the space, enhanced conditional statements.

Prediction: CATT-Acoustic employs a unique and general prediction method, called Randomized Tail-corrected Cone-tracing (RTC-II) that combines the best features of the Image Source Model (ISM), Cone-tracing and Ray-tracing.

Efficient Multiple Source Handling: After echograms have been predicted for a number of sources, new results for an arbitrary combination of these sources can be created rapidly.

Advanced Geometry Description: Conditional statements, run-time variable input, automatic locking of corners to surfaces, definition of a corner as the intersection between a line and a surface, scaling, rotation, mirroring, copying, looping for circular shapes, user-selectable colors for surface properties.

Source Directivity: Full space 10-degree format, 15-degree polar format or via a DLL Directivity Interface (DDI) enabling array modeling and beam steering.
Any-degree format available through CLF files (www.clfgroup.org).

Room Acoustic Measures: EDT, T15, T30, SPL (also in dB(A)), G10, RASTI, STI, LF, LEF, Ts, and IACC (full auralization version only).

Graphics: Shaded 3D models, interactive source information, wall hit statistics, decays, dynamic ray traces, audience area parameter mapping, echograms, image source space, reflector coverage, energy projected to a plane in time intervals, a neat 3D color vector display of impulse arrivals vs. time for a particular receiver, and an OGL fly-through model allowing 3D inspection of the model space from nearly any position.

Try the OGL viewer here. First download a small (101K) zip with three files to place in a new folder called, for example, CATT_OGL. Then you can download any OGL  file into the same folder to view the CATT model:  CC_Shaded.ogl ,  HK_Shaded.ogl ,  CL_Shaded.ogl ,  LB_Shaded.ogl . 

Advanced General Auralization: Binaural post-procesing with HRTF's, headphone EQ, and loudspeaker cross-talk cancellation. Fast convolution with anechoic music.

Walk-through Auralization: Binaural post-procesing with timed, sequential binaural impulse responses morphed into a walk-through experience. Either the source or the listener can be moving in the space. A new tool called CATTWalker facilitates this feature.

Plus: a surface properties library, batch processing capability, a customized editor, an extensive printed manual, and a comprehensive context-sensitive help. The full auralization version is shipped with a CD of anechoic audio resources.

[1] Vorländer, "International round-robin on room acoustical computer simulations", Proc 15th ICA pp. 689-692, Trondheim 1995
This ICA Paper is available here - - -

• Quick-peek at the summary only: Summary Only: (PDF file=56K)
• Or as a downloadable ZIP file containing four PDF pages: Vorländer ICA Paper (ZIP file=233K)

• Here is an excellent PDF slide show by Peter Svensson that summarizes the room acoustic modeling state-of-the-art in 2004: P. Svensson Slides

[2] Lake DSP Pty. Ltd. now part of Dolby Professional  -- Lake [Dolby] WEB site:

SOFTWARE VERSIONS— CATT-Acoustic comes in two units:
1) full prediction and full auralization,
2) full prediction and demo auralization.
For both units research/education discounts are offered. A fully working demo including limited auralization is available.
If the auralization unit is added after purchasing the prediction unit then the licencing clock starts again for one year.
An invalid license means that software updates from the CATT users page can not be installed.

AVAILABILITY—

CATT-Acoustic is available in the United States from:

Bang-Campbell Associates
26-G Chilmark Drive
East Falmouth, MA 02536
(508) 453-1318 [vox] (508) 453-9156 [fax]
email: rhcamp@rcn.com

RPG Diffusor Systems Incorporated

651-c Commerce Drive

Upper Marlboro, MD 20774

(301) 249-0044 [vox] (301) 249-3912 [fax]

email: info@rpg.com

USA Pricing effective August 1, 2005:

Full version - (full prediction, full auralization) $6,000.00

Full prediction, demo auralization: $3,000.00 

Full version, educational discount: $3,900.00 
 
Full prediction, demo auralization, education discount: $1,950.00

The education discount is available when CATT-Acoustic is ordered with an original, properly executed purchase order from a recognized college or university.

Existing CATT users may renew their licenses using Payal.
New licence key files are normally transmitted as an email attachment unless otherwise requested.
CATT License renewals purchased here are good for one year, permitting upgrades through the CATT user web site.