ACTIVE NOISE CONTROL DEVICE, ACTIVE NOISE CONTROL PROGRAM, AND ACTIVE NOISE CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide an active noise control device capable of correctly updating the filter coefficient of an adaptive filter, even when a vibration sound generated by the vibration of a housing surface due to a noise is input to an error microphone.SOLUTION: An active noise control device includes the error microphone which is set in a housing to which a noise is propagated and receives the noise, a control speaker which outputs a control signal for reducing the noise, a vibration sensor which receives the vibration sound generated from a vibration place, a vibration sound removal part which subtracts the input signal of the vibration sensor from the input signal of the error microphone, to calculate an error microphone input signal from which the vibration sound is removed, and an adaptive filter part which calculates the control signal by using the error microphone input signal after the removal and the impulse response of a secondary path reaching the error microphone from the control speaker after measurement, outputs the calculated control signal to the control speaker, and updates the filter coefficient of an adaptive filter.SELECTED DRAWING: Figure 1