电子科技
電子科技
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IT AGE
2012年
11期
31-34
,共4页
改进阈值函数%自适应阈值%小波去噪%信噪比
改進閾值函數%自適應閾值%小波去譟%信譟比
개진역치함수%자괄응역치%소파거조%신조비
improved thresholding function%adaptive threshold%wavelet denoising%signal-to-noise ratio
根据小波阈值去噪的基本原理,提出一种基于改进阈值函数和自适应阈值的信号去噪方法,该方法兼顾了硬、软阈值函数的优点,同时又在一定程度上弥补了传统阈值去噪方法的缺陷;引入自适应阈值选取算法,有效地解决了在每一级尺度上都采用同一阈值的不足。实验表明,此方法提高了信号的信噪比,去噪效果有明显的提高,克服了采用硬阈值法去噪效果不佳和软阈值法造成信号失真的缺点,充分展示了改进去噪方法的优越性。
根據小波閾值去譟的基本原理,提齣一種基于改進閾值函數和自適應閾值的信號去譟方法,該方法兼顧瞭硬、軟閾值函數的優點,同時又在一定程度上瀰補瞭傳統閾值去譟方法的缺陷;引入自適應閾值選取算法,有效地解決瞭在每一級呎度上都採用同一閾值的不足。實驗錶明,此方法提高瞭信號的信譟比,去譟效果有明顯的提高,剋服瞭採用硬閾值法去譟效果不佳和軟閾值法造成信號失真的缺點,充分展示瞭改進去譟方法的優越性。
근거소파역치거조적기본원리,제출일충기우개진역치함수화자괄응역치적신호거조방법,해방법겸고료경、연역치함수적우점,동시우재일정정도상미보료전통역치거조방법적결함;인입자괄응역치선취산법,유효지해결료재매일급척도상도채용동일역치적불족。실험표명,차방법제고료신호적신조비,거조효과유명현적제고,극복료채용경역치법거조효과불가화연역치법조성신호실진적결점,충분전시료개진거조방법적우월성。
According to the theory of wavelet threshold denoising,a signal denoising method based on improved threshold function and adaptive threshold is put forward,which incorporates the advantages of hard and soft threshold functions,and makes up to some extent for the defects of traditional threshold denoising methods.The introduction of adaptive thresholding algorithm effectively saves the need to using the same threshold on each scale.Experimental results show that this method improves the signal-to-noise ratio and the denoising effect by overcoming the disadvantages of the poor denoising effect of hard thresholding and the distortion caused by soft threshold method.
