The computer simulation results have shown that LMS method is much better than empirical FFT method.
文章中还对各种用于测量FETF冲激响应的激励方法作了分析和比较。
Four conventional algorithms for current RMS, amplitude error and phase error were discussed, and FFT algorithm was selected from them and realized in LabVIEW language.
研究了计量与参考通道的电流有效值以及二者的比差和相差的四种常用算法，从中选择了FFT算法并用LabVIEW语言实现。
It is convenient to calculate derivative in wave number space using the inbuilt FFT function in Matlab.
利用Matlab内建的快速傅氏变换函数可以方便地在波数域计算重磁异常导数。
An interpolated FFT algorithm based on Triangular Self-convolution Window was proposed for electric energy measurement. The workflow of the new algorithm was given, and the calculation methods of fundamental and harmonic electric energy were deduced.
提出了一种基于三角自卷积窗的插值FFT谐波分析和电能计量算法，结合三角自卷窗的频谱特性，给出了其实现流程，建立了基波和谐波分次电能计量方法。
Phase measurementresearch and realization adapt TMS320VC5410 as core process unit based onthe principle of fast fourior transform. The input signals pass through theprepositive circuit which transforming the measured signalsinto small voltage signal, and then pass low filter to wipe off noise.
采用FFT变换，利用TMS320VC5410作为核心处理单元，进行相位测量的研究和实现，采用前置电路将被测信号变换成小电压信号，经过信号调理电路把信号进行滤波，根据电力系统频率的不稳定，采用PLL倍频电路对A/D进行采样逻辑控制，实现了同步采样。
During the process of ZOOM-FFT, the extracting multiple of narrow band is firmly related to the final result.
在实现 ZOOM-FFT 算法的过程中，对窄带信号抽取的倍数直接关系到最后结果的精确度。
Using this method, the frequency spectrum is got refinement. During the process of ZOOM-FFT, the extracting multiple of narrow band is firmly related to the final result.
在实现ZOOM-FFT算法的过程中，对窄带信号抽取的倍数直接关系到最后结果的精确度。
In order to reduce the influence of the mixing and overlap of frequency spectrum on the calculated result in the calculation of the fast Fourier transform of diffraction, the interval of sampling should be taken to be as small as possible.
在衍射的快速傅里叶变换计算中，为减小频谱混叠对计算结果的影响，应尽可能缩小取样间隔对函数进行离散。然而，大数目的取样对于容量有限的 FFT程序通常会形成困难。
Then the FFT algorithm of the cubic phase function is derived, and is further improved through rounding the last sample point so as to use in practical discrete sampling systems.
然后推导了三次相位函数的FFT快速算法，并进一步采用了舍入最近采样点的方法改进算法，使其可以应用于实际的离散采样系统。
However, a many number of sampling leads to great difficult in general to FFT program with finite computer memory.
然而，大数目的取样对于容量有限的FFT程序通常会形成困难。
And the leakage and picket fence effects of FFT will result in obvious measure errors.
FFT算法的泄漏现象和栅栏效应将会导致较大的测量误差。
Finite word-length in implementation of a block floating-point FFT processor.
块浮点FFT处理器的有效字长效应分析。
The method has fast calculating efficiency by FFT, stabile algorithm and can handle variable velocity in landscape orientation by PSPI, so it provides a new effective tool for convenient simulating complex 3-D underground geologic body.
该方法可以采用相位移加插值方法处理一定的横向变速情况，可以更加灵活方便地模拟地下复杂的三维地质体。
The method has fast calculating efficiency by FFT, stabile algorithm and can handle variable velocity in landscape orientation by PSPI, so it provides a new effective tool for conveniently simulating complex 3D underground geologic body.
该方法采用傅立叶变换进行计算不仅计算迅速，算法稳定，而且可以采用相位移加插值方法处理一定的横向变速的情况，为更加灵活方便地模拟地下复杂的三维地质体提供了一种有效的工具。
Langmuir probe was used to study the FFT power spectra density of the plasma properties and the float potential signals.
采用朗繆尔探针研究等离子体中参数和浮置电位信号的傅立叶变换功率谱密度(Power Density Spectra，PSD)。
The results show that the vibration intensity at foundation is decreased with the increase of the weight of superstructure and the burial depth of foundation, and that the FFT predominant frequency at foundation is slightly decreased with the increase of the weight of superstructure.
结果表明，基础的振动强度随基础埋深和上部结构重量的增加而减小，FFT主振频率随上部结构重量的增加而略有减小。
The arithmetic may be realized by shift and its velocity is superior to the DCT transformation.
设计了具有FFT类型的快速算法，该算法可采用移位操作实现，其速度优于DCT变换。
Fast numerical solution for EHL of line contact is realized by using FFT and convolution integral method.
利用信号分析的快速傅里叶变换及其卷积性质，实现了线接触弹流问题弹性变形方程的快速计算，其计算工作量为O(Nlog2N)。
Fast Fourier transform has a higher error in the harmonic analysis of the electric power system.
快速傅里叶变换(fast Fourier transform，FFT)存在较大的误差，不适宜直接用于电力系统谐波分析中。
It is shown that the FFT logic can steadily run at 60 MHz, and the time for processing a single frame of data is 38 μs and the pipeline delay time is 116ns in the practical test of power harmonic detector.
在电力谐波检测仪原型应用的测试表明，该FFT运算逻辑可稳定运行在60MHz，单帧数据的处理时间为38μs，流水线操作延迟为116 ns，取得了良好的应用效果。