THREE-DIMENSIONAL SPACE ACTIVE NOISE/VIBRATION CONTROL SYSTEM AND ITS PRIOR LEARNING METHOD

摘要

PROBLEM TO BE SOLVED: To reduce the number of error connection system filters and to shorted a time for prior learning in a three-dimensional active noise/vibration control system. SOLUTION: Noise/vibration is detected by a first sensor 2 to be inputted to a first filter 3 of active noise/vibration control system 1a-1d. Its output is imparted parallel to plural sound/vibration generation means 4, and the noise/ vibration in a three-dimensional closed space is canceled. Further, an additional value of the outputs of second sensors 5 and the output of a second filter 6 are imparted to a coefficient adjustment means 7, and the coefficient of the first filter 3 is updated. When the prior learning of the second filter 6 is performed, the output of a reference signal source 8 is imparted to respective sound/vibration generation means 4 and the filter 6, and the coefficient of the filter 6 is adjusted so that differences between the detection outputs of the second sensors 5 and the output of the filter 6 are reduced. Then, after one side filter 6 is learned, the learned coefficient is copied by other side filter 6.