ACTIVE-NOISE-REDUCTION DEVICE, AND ACTIVE-NOISE-REDUCTION SYSTEM, MOBILE DEVICE AND ACTIVE-NOISE-REDUCTION METHOD WHICH USE SAME

摘要

A reference signal generating unit of an active-noise-reduction device of the present invention outputs a referencing signal having a correlation with a vibration to an adaptive filter unit. A filter coefficient update unit receives an input of an error signal, and successively updates a filter coefficient of the adaptive filter unit. The error signal is generated by a cancelling sound based on the output of the adaptive filter unit and noise. The detection unit detects a filter coefficient of the filter coefficient update unit, and determines a size of the output of the adaptive filter unit. Then, the amplitude of the cancelling sound is adjusted based on the size of the output of the adaptive filter unit estimated by the detection unit.

主权项

1. 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.