基于时频谱图的脉冲噪声抑制方法  

Impulsive noise suppression based on time-frequency spectrogram

作　　者：王旌阳[1] 张潇[2] 朱俊敏[1] 吴粤北[2] 

机构地区：[1]上海交通大学计算机科学与工程系,上海200240 [2]上海音乐学院音乐工程系,上海200031

出　　处：《振动与冲击》2010年第2期149-153,192,共6页Journal of Vibration and Shock

基　　金：上海市科委重大科技攻关项目(075115003)

摘　　要：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。A new method to cope with impulsive noise in audio signals based on time-frequecy analysis was proposed.This method detected impulsive noise by distinguishing differences of frequency characteristics and correlations between a clean signal and a noisy one based on the spectrogram of a corrupted audio signal.A scheme 'band-pass' was introduced 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 performances 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.

关 键 词：时频分析 脉冲噪声 时频谱图 中值滤波 

分 类 号：TN911.72[电子电信—通信与信息系统]