改进的小波阈值函数在超声波无损检测信号中的应用

摘要

For shortcomings of soft and hard threshold function in wavelet threshold denoising, a new improved threshold function was presented. The new threshold function has been used in the noise reduction of ultrasonic signal in the simulation experiments. The results show that new threshold function can overcome the disadvantages of hard and soft threshold functions, and it is suggested to select the parameter of N=30 in the real application to get a better denoising.%针对小波阈值降噪中，软、硬阈值函数的缺点，提出了一种改进的阈值处理函数方法。将新阈值函数用于超声检测信号去噪仿真实验中，仿真结果表明，新阈值函数能够克服软硬阈值的不足，并且选取参数N=30时降噪效果最佳。