| 摘要 |
PROBLEM TO BE SOLVED: To provide an active noise control device capable of providing the excellent noise reducing effect, even when a control frequency is different from a frequency of actually generating noise. SOLUTION: An active noise reducing device comprises a control frequency correcting means 15 for determining a correction quantity of the control frequency in response to behavior of a filter factor of a first one-tap digital filter 7 and a filter factor of a second one-tap digital filter 8. With this constitution, this active noise control device can correct the control frequency so as to approach the frequency of the actually generating noise. Thus, for example, even when the control frequency outputted by a control frequency determining means 2 is different from the frequency of the actually generating noise by inconvenience of an engine speed detector 1, the excellent noise reducing effect can be exhibited by correcting this difference. COPYRIGHT: (C)2010,JPO&INPIT |
