JP2009255664A5 - - Google Patents

Claims (5)

Control frequency detection means for detecting the frequency of noise to be controlled due to a noise source, sine wave generation means for generating a sine wave having the same frequency as the control frequency determined by the control frequency detection means, and the sine wave generation A 1-tap digital filter to which a sine wave from the means is input, and a control signal generation for outputting a control signal for receiving an output signal from the 1-tap digital filter and causing interference with noise to be controlled caused by the noise source Means, an error signal detecting means for detecting an error signal resulting from interference between the control signal output from the control signal generating means and noise to be controlled caused by the noise source, and a filter of the one-tap digital filter Coefficient updating means for updating a coefficient; and phase correction means for correcting the phase of the sine wave generating means; Phase correcting means, the error signal by respectively utilizing updating the filter coefficient and the phase and configured active noise control system so as to reduce the noise to be controlled due to the noise source. 2. The coefficient updating unit is configured to update the filter coefficient based on the error signal and a phase characteristic of a transfer characteristic from a control signal generating unit to an error signal detecting unit at a control frequency. Active noise control device. The phase correction unit is configured to determine a phase of the sine wave generation unit based on the error signal and a phase characteristic of a transfer characteristic from the control signal generation unit to the error signal detection unit at a control frequency. The active noise control apparatus according to claim 1. Control frequency correction means for correcting the control frequency of the control frequency detection means, the control frequency correction means based on the accumulated value of the phase correction amount calculated by the phase correction means, the control frequency of the control frequency detection means The active noise control device according to claim 1, wherein the active noise control device is configured to correct the noise. The sine wave generating means moves the reading position of the sine wave table that holds one cycle of the discretized sine value at a predetermined period, and further moves the reading position by the phase correction amount determined by the phase correcting means. The active noise control apparatus according to claim 1, wherein the active noise control apparatus is configured to cause the noise to occur.