CAJ | 학술논문

针对语音信号的宽带特性，基于离散小波变换提出一种自适应消噪方案(DWTANC)，该方案利用多分辨率分析理论，把信号和噪声分解于不同的频率范围中，使信号和噪声的频谱得到简化，从而减少了自适应滤波器的级数L，使输入自相关矩阵阶数降低，从而改善了它的自适应时间和输出精度，增强了其抗干扰能力。计算机仿真结果证实上述论断的正确性。
침대어음신호적관대특성，기우리산소파변환제출일충자괄응소조방안(DWTANC)，해방안이용다분변솔분석이론，파신호화조성분해우불동적빈솔범위중，사신호화조성적빈보득도간화，종이감소료자괄응려파기적급수L，사수입자상관구진계수강저，종이개선료타적자괄응시간화수출정도，증강료기항간우능력。계산궤방진결과증실상술론단적정학성。
For denoising the wide-band speech signal, this paper presents a new adaptive noise canceling method based on discrete wavelet transform (DWTANC) . This method analyzes the signal and noise into different frequency range with multiresolution analysis (MRA), and makes the signal and noise simple in frequency range, so the adaptive filter's orders would be shorted, and its self-cor-relative matrix' s orders will also be shorted. So it improves the performance of adaptive noise canceling system, shorts the adaptive time and enhances the signal noise ratio (SNR), at last, the computer simulation test validates the conclusion above.