EASE Auralization
	After having finished the simulation, one would also like to hear how the planned sound reinforcement system transmits the sound or how an original sound source , e. g. a group of musicians or even an orchestra, would sound in a room. One can easily imagine that this auralization, i e. making audible sound events that take place in virtual room, became possible only after the introduction of a modern computer technology. The corresponding simulation in EASE4.1 produces an impulse response that contains apart from the frequency and level information also the directional information for the respective sound incidence.
	Auralization
	Now this still monaural reflectogram undergoes a convolution with measured head-related transfer functions, in order to obtain binaural impulse responses. The head-related transfer functions used are provided for EARS by the Institut für Technische Akustik, Prof. Blauert, Ruhr-Universität Bochum:
	HRTF for EASE4.1 IR for left ear
	Impulse responses IR for both ears
	Now follows the proper real-time auralization by means of a special software module that was developed jointly by ADA and Lake DSP, Australien. By means of the module it is now possible to produce convolutions in real time and exclusively without any additional hardware. Only a sound card, preferably with duplex-mode capability, is required for AD and DA conversion. Another feature consists in the implementation of a 3D reproduction module that will enable stereo hearing although one is seated only directly in front of two reproduction monitors.
	Real- time Concolver in EASE4.1
	The Stereo Convolver is a completely new feature of EASE4.1
	Tasks handled by Auralization: Comparison of acoustic conditions before and after the realization of room-acoustical measures Comparison of measured data with simulation results Convincing a client or an architect of the benefit of planned measures, but also of the expenditure involved Demonstration of acoustical effects Making audible the effect of a sound-reinforcement system or of a natural source Comparison of an old installed system with a new one to be planned Assessment of the quality of sound transmission Making sound events audible in rooms which do no longer or not yet exist Making sound audible for research purposes Determinination of quality standards