针对血流多普勒信号的谱估计问题 ,将经典的短时傅立叶变换谱图和现代小波尺度图进行了比较 ,从时 -频分布的观点 ,分析认为 ,STFT谱图和小波尺度图是Wigner-Ville分布的一种特殊情形 ,STFT谱图是平滑的伪Wigner-Ville分布 ,小波尺度图是一种仿射平滑的Wigner-Ville分布 ,对于实际仿真的多普勒信号 ,计算得到的STFT谱图和小波尺度图表明 ,小波尺度图的低频效果较好 ,但是交叉项干扰也较大。 According to the spectral estimation of blood flow Doppler signal, the classical short-time Fourier transform spectrum is compared with the modern wavelet scale. From the view of time-frequency distribution, it is considered that STFT spectrum and wavelet scale are Wigner -Ville distribution. The STFT spectrum is a smooth pseudo Wigner-Ville distribution. The wavelet scale is an affine smoothed Wigner-Ville distribution. For the actual simulated Doppler signal, the calculated STFT spectrum Graphs and wavelet scales show that the low-frequency scale of the wavelet scale is better, but the cross-term interference is also larger.