|TUCT™ stands for The Universal Cone Tracer
and predicts echograms and room impulse responses offering
several different internal algorithms depending on the room
case, ranging from basic to advanced. In particular it offers
very good ways to predict and auralize open cases (outdoor arena
etc.) that traditionally often have necessitated making a faked
closed model for most algorithms to work well, especially for auralization,
and cases where flutter echos may be important. Also prediction
and auralization in big indoor venues with
high absorption will benefit. The core
algorithms are based on various levels and combinations
of actual and random
diffuse ray split-up and are general so that as the algorithms
are further refined and computer speed increases additional levels
of actual split-up can be incorporated.
TUCT™ relies on the geometry modeling view/check and library handling (absorption, source directivity, HRTFs, headphones) of the CATT-Acoustic™ main program (CATT-A) that exports a file (.CAG) containing the data necessary and runs TUCT™. Everything previously learned regarding geometry modeling in CATT-Acoustic™ and old models can thus be directly used but all prediction and auralization is from v9 instead performed by TUCT™ in a simpler, more general and more flexible way.
TUCT™ is a near total rewrite from scratch but also includes some parts of CATT-Acoustic™ v8 such as Pixel rendering, an Image source model and Time trace that are adapted and extended to work with TUCT™ as separate tools in a more flexible and integrated way. Most parts of the CATT-Acoustic™ v8 post-processing have no direct correspondence in TUCT™, they are simply not needed. The few remaining, still useful but not very often used, utilities are kept in the stripped-down CATT-A v9.
Major differences between TUCT™ and the previous CATT-Acoustic™ v8 prediction/auralization:
|Predict SxR predicts echograms and impulse response for each selected Source x Receiver (SxR) combination and utilizes multiple CPU cores. Three different main prediction algorithms ranging from basic to advanced. The algorithm choice depends on the room type and the level of details and auralization quality desired. Higher order B-format (2nd or 3rd) can be selected for external decoding and 5-ch mic setups can be used for ITU 5-ch surround. Diffraction can optionally be included for early sound. Special test options with any combination of direct sound, 1st order specular and diffraction. One of two internal methods is automatically selected to create the impulse responses depending on case:|
|Displays the room model in plan, side and end views with mouse zooming/panning and an optional 2D grid. The Plan/Section Cut z checkbox enables a moveable z (height) cut-plane to make it easier to see source, receiver and audience details in a room with many ceiling details (see heavy horizontal red line in figures below):|
|Displays direct or reflected sound at all walls and/or audience surfaces at a selected spatial resolution, since the resolution is not pixel-based the model can be rotated after calculation. Mouse-over value readout and auto-scale option.|