Discrete Fourier Transform is separating discrete signal into amplitude value andfrequency value, it's one of the main tools in digital signal processing field. But becauseof its large computational complexity, its application is limited.
离散傅立叶变换是将离散信号分解为幅值分量和频率分量，是数字信号处理领域的工具之一，但是由于其计算量太大，应用受到限制。
参考来源 - 基于TMS320F2812的数据采集及FFT的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A analytic function can be derived to fit the observed amplitude value curve.
根据观测振幅曲线，可以求出拟合此观测值的解析函数。
When the frequency is low, the recorded acoustic amplitude value is high. So the evaluation result is reliable.
发现频率低时，由于记录到的声幅值较高，评价结果可靠。
The construction of compression piezoelectrical sensors and amplitude value linearity of axial sensitivity are described.
文章简述了压缩式压电加速度传感器的结构原理和灵敏度的幅度值线性度问题。
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