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采用小波软、硬阈值函数折中后的小波阈值方法对天然放射性环境下γ谱数据进行平滑处理。通过Matlab数据分析软件,分析对比了五种不同的平滑去噪方法:五点平滑法、傅里叶变换法、小波软阈值法、小波硬阈值法,以及折中的小波阈值方法。结果表明:折中的小波阈值方法在反映γ能谱特征的峰本比和峰总比分别为7.1609,0.3945,平滑去噪效果要明显优于其他四种方法,能最大程度地保留原始信号特征,具有较高的应用价值。
The γ spectrum data of the natural radioactive environment is smoothed by using the wavelet threshold method of the wavelet soft and hard threshold functions. Through Matlab data analysis software, five different smoothing denoising methods are analyzed and compared: five-point smoothing method, Fourier transform method, wavelet soft thresholding method, wavelet hard thresholding method and compromise wavelet threshold method. The results show that the compromised wavelet threshold method is 7.1609 and 0.3945, respectively. The smoothing denoising effect is obviously better than the other four methods, which can preserve the original signal features to the maximum extent , With high application value.