In this paper the zoom fast DFT computative method of the time-limited signal is given.
本文给出时限信号的细化变换算法。
In the a high frame rate (HFR) ultrasonic imaging system, the weighting process by limited diffraction beams on echo signal takes the most of the calculation time for constructing an image.
在高帧率超声成像算法中，对回波信号进行有限衍射波束加权处理占用了成像中大部分计算时间。
Besides designing and selecting waveforms, in order to acquire high time bandwidth product, it is the major practical method to increase the bandwidth of the signal with limited time duration.
除了对波形本身的设计和选择，设法增大有限时宽信号的带宽，是实际获得大时带积脉压信号的主要手段。
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