划信号 meaning in English

dash signal

Lacking of space locality in time domain , fourier analysis can only make certain of the integral singularity of a function or signal . as a result , it is difficult to detect the spatial position and distribution of broken signal by fourier analysis . wavelet analysis has the characteristic of spatial locality , and its wideness in both windows of the time and the frequency can be adjusted , so it can analyze the details of a signal
经典的fourier变换把信号按三角正、余弦基展开，将任意函数表示为具有不同频率的谐波函数的线性迭加，能较好地刻划信号的频率特性，但它在时空域上无任何分辨，不能作局部分析，这在理论和应用上都带来了许多不便。