You can fix this by defining a few simple rules from which to reduce the amount of noise, such as removing all words of three letters or less and removing any words with a frequency of 3 or less.
可以通过定义一些简单的规则来解决这个问题，这些规则用于降低干扰，比如说去除所有三个字母以内的单词以及去除频率在3以内的单词。
Three typical stress waves induced by impact loads were analyzed by both Fast Fourier Transform (FFT) and Wavelet, and the distribution rules of frequency and energy of stress waves were obtained.
对三种典型应力波分别利用傅立叶变换与小波变换进行了对比分析，得知了它们的频率分布以及能量分布规律；
应用推荐