经过限带滤波后的QDPS K信号的码元波形可分为稳定区与过渡区，根据这一特点可以利用DFT方法来实现信号的解调和位同步。
After a bandpass filter, QDPSK signal's symbol can be divided into steady section and transition section, so the demodulation and synchronization for the signal can be realized with DFT.
右位心胎儿DV多普勒血流波形的心房收缩波近缺失。
DV Doppler waveform of this dextrocardia fetus showed a nearly ab - sent atrial systole wave.
采用8位LED显示器动态刷新方式，显示波形类型、频率和幅度。
Using 8 LEDs display dynamic to renovate the method, display waveform type, frequency and the range.
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