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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Extraction of 3D Information from Circular Array Measurements for Auralization with Wave Field Synthesis | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 13416 10 pages doi 10.1155 2007 13416 Research Article Extraction of 3D Information from Circular Array Measurements for Auralization with Wave Field Synthesis Diemer de Vries Lars Horchens and Peter Grond Laboratory of Acoustical Imaging and Sound Control Department of Image Science and Technology Faculty of Applied Sciences Delft University of Technology P.O. Box 5046 2600 GA Delft The Netherlands Received 29 April 2006 Revised 3 October 2006 Accepted 8 February 2007 Recommended by Ville Pulkki The state of the art of wave field synthesis WFS systems is that they can reproduce sound sources and secondary mirror image sources with natural spaciousness in a horizontal plane and thus perform satisfactory 2D auralization of an enclosed space based on multitrace impulse response data measured or simulated along a 2D microphone array. However waves propagating with a nonzero elevation angle are also reproduced in the horizontal plane which is neither physically nor perceptually correct. In most listening environments to be auralized the floor is highly absorptive since it is covered with upholstered seats occupied during performances by a well-dressed audience. A first-order ceiling reflection reaching the floor directly or via a wall will be severely damped and will not play a significant role in the room response anymore. This means that a spatially correct WFS reproduction of first-order ceiling reflections by means of a loudspeaker array at the ceiling of the auralization reproduction room is necessary and probably sufficient to create the desired 3D spatial perception. To determine the driving signals for the loudspeakers in the ceiling array it is necessary to identify the relevant ceiling reflection s in the multichannel impulse response data and separate those events from the data set. Two methods are examined to identify separate and reproduce the relevant .
