短时傅立叶变换，确定时变信号其局部区域正弦波的频率与相位-short-time Fourier transform

短时傅里叶变换是一种基于窗函数的变换，短窗能够提供较好的时域解析度，长窗能够提供较好的频域解析度。-Short-time Fourier transform is a transform window function based on the short window in the time domain can provide better resolution, the long window can provide better resolution in the frequency d