The two dimensional FFT method is applied to process closed fringe.
研究了二维fft处理闭合干涉条纹的算法。
FFT method is used here to decode the multi - frequency Register signals, which is also suitable for other multi - frequency signals' detection.
解码部分采用FFT算法从频域进行检测，该方法也可用于其它多频信号的检测。
The Gaussian quadrature is a highly accurate numerical integrator and yields results that outperform those from the prism method and the FFT method.
高斯积分法是一个高精度的数值积分方法，它的计算结果精度胜过角柱体法与快速傅利叶法。
Since the flight test data are of time domain, it needs to be converted into frequency domain by FFT method. Then it can be used to identify the system.
由于飞行试验数据是时域数据，使用这种方法需要使用FFT的方法将实测的时域数据转换成频域数据后再进行辨识。
It is normal to use the FFT method to analyze signals. This method is one kind of mathematical method that changes the time domain signals to frequency domain signal.
对信号进行分析时通常采用传统的傅立叶变换方法，傅立叶变换是时域和频域相互转换的数学工具，从物理意义上讲其实质是将信号分解成许多不同频率的正弦波的叠加。
This paper presents the input voltage shape reconstructed by FFT method from the distorted output shape and unit step response of impulse high voltage measuring system.
本文介绍了一种根据冲击测量系统的方波响应和输出波形，利用FFT算法重建输入波形的方法。
Compared with traditional FFT method, MESE not only has higher resolution but also fits the processing of transient data, so, it can show the relation of amplitude to both time and frequency.
与传统的FFT相比极大熵谱法具有频率分辨率高，适于短时瞬态数据处理，而且能给出振动幅值与频率和时间三者的关系。
The results indicate that, for high resolution superstructure of IIR of ship targets, lo-cal features are better than global features. That is, spline function method is better than FFT method.
实验结果表明，对于高分辨率的舰船上层结构的红外象而言，局部化特征优于全局化特征，即采用样条函数法比FFT法有较高识别率。
The correlation method and FFT method of the power spectrum estimation could not completely reflect the concept of the power spectrum of the non-stationary random signals because of data truncation.
对于非平稳随机信号的功率谱分析，采用自相关函数傅里叶变换和直接傅里叶变换分析时，由于存在数据截断，二者从概念上都不能很好地反映随机信号的功率谱。
The simulation results show that compared with the traditional FFT method, correlation wavelet method exhibits obvious advantages over FFT method, and the accuracy of the results is greatly improved.
结果表明，相关小波法比FFT方法具有更明显的优势，获得了更高精度的脉冲响应函数和频响函数的提取。
After deeply studied in the fast Fourier transform (FFT) method, this paper presents an improved FFT algorithm considering the half-wave symmetric characteristic of power system signals.
在深入分析快速傅里叶变换(FFT)方法的基础上，针对一类电网信号具有半波对称性的特点，提出了一种改进的FFT算法。
The two-dimensional fast Fourier transform (2D-FFT) method has been used to analyze the ultrasonic signals where different wave modes overlaid in the time domain.
利用二维快速傅立叶变换的时频分析方法，对有限元计算得到的时域信号进行了分离，得到了各个模式超声波的相速度色散曲线。
The two-dimensional fast Fourier transform (2D-FFT) method has been used to analyze the ultrasonic signals where different wave modes overlaid in the time domain.
利用二维快速傅立叶变换的时频分析方法，对有限元计算得到的时域信号进行了分离，得到了各个模式超声波的相速度色散曲线。
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