Zhong Yan Jiong
Zhang Zhen Shan
Dept. of Automatic Control, Univ. of Sci. and Technol., Beijing 100083, People's Republic of China
A mathematic model of the impulse response of a MIMO speaker--microphone system in the spatial field space is obtained by means of a pseudo-random correlation identification. Two methods are selected for space active noise control. One method is the developed adaptive filter presented by the authors, which is a recursive algorithm with interlacing cycle and increasing phase. The other method proposed by the authors is to find a match point in the spatial field, which ensure that an active noise signal has the same shape and advanced phase in comparison with that of the canceling point. The single frequency signal, multifrequency signals, and the noise sampled from a motor driver cabin are used as the tested noise for digital simulation, electricity analogy experiment, and a test of the sound field in space. All the results prove the effectiveness and practicability of the two methods. Thus regardless of the qualities of the electricity-sound instruments, better results will be reached by way of a match point in the spatial field than by use of the adaptive filter.
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