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 that correctly updates a filter coefficient even when a reverberation component remains in the impulse response of a secondary route.SOLUTION: This active noise control device has: a first microphone for receiving a noise and disposed in a pipe through which the noise propagates; a speaker for outputting a control signal to the inside of the pipe; a second microphone for receiving a sound at an opening and disposed at the opening inside the pipe; a reverberation component calculation unit for calculating an estimated reverberant sound using the control signal and the impulse response of the reverberation component of a secondary route; a reverberation component removal unit for calculating a second microphone input signal in which the estimated reverberant sound is removed from the input signal of the second microphone; and an adaptive filter unit for updating the filter coefficient and calculating a control signal using the input signal of the first microphone, the second microphone input signal in which the estimated reverberant sound is removed, a control signal at immediately preceding time of day, the impulse response of a feedback route, and the impulse response of the secondary route.SELECTED DRAWING: Figure 1