Active-noise-reduction device, and active-noise-reduction system, mobile device and active-noise-reduction method which use same

An active-noise-reduction device, comprising:

• a first input terminal for receiving, from outside, a referencing signal having a correlation with noise;
• a reference signal generating unit for outputting a reference signal based on the referencing signal;
• an adaptive filter unit into which the reference signal is input and from which a cancelling signal is output;
• an output terminal for supplying the cancelling signal to outside;
• a correction unit into which the reference signal is input and which generates a correction reference signal based on simulated acoustic transfer characteristics data that simulate acoustic transfer characteristics of a signal transfer path of the cancelling signal;
• a second input terminal into which an error signal based on a residual sound by interference between the cancelling signal and the noise is input;
• a filter coefficient update unit for sequentially updating a filter coefficient of the adaptive filter unit based on the error signal and the correction reference signal;
• and
• a detection unit for detecting the filter coefficient, wherein the detection unit generates a control signal for adjusting an amplitude of the cancelling signal based on the detected filter coefficient.