The Doppler blood flow signal is inherently a nonstationary Gaussian random process whose time-frequency representation associates with the time-varying velocity of blood flow and its variations.
多普勒超声血流信号是一个非平稳的高斯随机过程，其时频分布与血流的速度及其变化有密切的关系。
The Doppler blood flow signal is inherently a nonstationary Gaussian random process whose time-frequency representation associates with the time-varying velocity of blood flow and its variations.
多普勒超声血流信号是一个非平稳的高斯随机过程，其时频分布与血流的速度及其变化有密切的关系。
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