이산 웨이블릿변환 기반 온라인 2차 결로 모델링을 이용한 자동차 실내 능동소음제어 기법

The conventional filtered-X LMS (FXLMS) has been applied as an adaptive algorithm for active noise control (ANC) for car-room noise cancellation, but, it sometimes yields some convergence problems, since its convergence performance can be affected by the filtered signal and the corresponding ANC system can be time-varying in nature. To solve such problems, several on-line secondary path modeling approaches using auxiliary noise have been reported. However, those approaches using auxiliary noise may result in generating additional residual noise, and thus denoising control rate of ANC systems can be decelerated. In this paper, an efficient discrete wavelet transform based on-line secondary-path modeling for ANC is proposed, which offers fast convergence during the ANC system operation.