  A toolbox for creation and rendering of dynamic virtual acoustic environments
(TASCAR) that allows direct user interaction was developed for application in
hearing aid research and audiology. This technical paper describes the general
software structure and the time-domain simulation methods, i.e., transmission
model, image source model, and render formats, used to produce virtual acoustic
environments with moving objects. Implementation-specific properties are
described, and the computational performance of the system was measured as a
function of simulation complexity. Results show that on commercially available
commonly used hardware the simulation of several hundred virtual sound sources
is possible in the time domain.
