| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensorless active noise control device which attains high-speed control and increases followability and a noise reduction effect.SOLUTION: An active noise control device includes: a control device 11 of a power source; a control target area 16 to which a sound generated by the power source is transferred as a control target sound; a DSP 13 for performing signal processing with a drive control signal of the power source as an input signal; an amplifier 14 for amplifying an output signal from the DSP 13; and an actuator speaker 15 for outputting a control sound from the amplified output signal to the control target area 16. The DSP 13 comprises: a signal processing circuit 18 for estimating frequency characteristics of the control target sound from the input signal and calculating a control target frequency of order components; and an ADF/LMS algorithm 20 for performing ANC control by using an individual convergence coefficient for each frequency of order components of the calculated control target frequency. The actuator speaker 15 outputs the control target sound and control sound to the control target area 16 in response to the output signal from the ADF/LMS algorithm 20. |
