CAJ | 학술논문

从时频分析的角度,提出了一种新的音频信号脉冲噪声的处理方法.该方法基于被污染信号的时频谱图,通过区分纯净信号和脉冲噪声信号的频域特性与相关性来检测脉冲噪声.首次提出前后信息相关联的"限幅"噪声抑制方法.并利用带过滤系统的中值滤波方法分别对短时和暂态两种脉冲噪声信号加以抑制和消除.和信噪比相比,还进一步提出了四个指标专门用于评价去除脉冲噪声方法的性能.基于这四个指标,分析了如何调整参数以获得更好的检测和修复性能,并用大量仿真实验证实了这种新方法的有效性.最后给出了系统仿真结果,并指出了该方法的应用前景.
종시빈분석적각도,제출료일충신적음빈신호맥충조성적처리방법.해방법기우피오염신호적시빈보도,통과구분순정신호화맥충조성신호적빈역특성여상관성래검측맥충조성.수차제출전후신식상관련적"한폭"조성억제방법.병이용대과려계통적중치려파방법분별대단시화잠태량충맥충조성신호가이억제화소제.화신조비상비,환진일보제출료사개지표전문용우평개거제맥충조성방법적성능.기우저사개지표,분석료여하조정삼수이획득경호적검측화수복성능,병용대량방진실험증실료저충신방법적유효성.최후급출료계통방진결과,병지출료해방법적응용전경.
A new method to cope with impulsive noise in audio signals based on time-frequecy analysis was pro-posed. This method detected impulsive noise by distinguishing differences of frequency characteristics and correlations be-tween a clean signal and a noisy one based on the spectrogram of a corrupted audio signal. A scheme "band-pass" was in-troduced and the median value filtering method was used with a filtering system to suppress and remove short time and long time impulsive noises. For the sake of evaluating a denoising method, four criterions were proposed further to assess per-formances of various methods comparing with SNR. Based on the four criterions, how to adjust parameters to achieve the best performance was analyzed, then many simulations were performed to confirm the feasibility of the proposed method.Finally, some insights of this novel method were given according to its simulation results.