| 摘要 |
PURPOSE:To provide the sound elimination device which stably and sufficiently eliminates a sound and can be expanded in sound elimination range by using plural noise control systems and enabling each noise control system to adaptively process a noise without receiving crosstalk of other channels. CONSTITUTION:A sound elimination device consists of a microphone 1a which detects the noise from a noise source, adaptive filters 2a-2d which adaptively control a detected noise signal, adders 3a and 3b which adds their outputs, speakers 4a-4b which reproduce their outputs, microphones 1b and 1c which detect the reproduced sounds and noise, FIR filters 6a and 6b which signal process the outputs of the adaptive filters 2a and 2b, FIR filters 6c and 6d which signal processes the outputs of the adaptive filters 2c and 3d, FIR filters 6e-6h which signal processes the outputs of the adders 3a and 3b, and computing elements 5a-5d which processes the outputs of the microphones 1b and 1c and the outputs of the FIR filters 6a-6h to generate control signals for the adaptive filters 2a-2d. |
