Fourier-transform method was a method could be used for the design of Gradient-index thin film according to the desired spectral transmission curve.
傅里叶合成方法是一种可以根据期望的光谱特性曲线设计渐变折射率薄膜的方法。
Fast Fourier Transform (FFT) is an effective method to detect harmonic.
快速付立叶变换(FFT)是对谐波进行检测的有效方法。
Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between Windows.
频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。
For discrete convolution equation set, generally, people use Fourier transform method to solve. But in some positions, zero frequency will lose.
对于离散卷积方程组，一般采用傅氏变换的方法求解，但在某些特定系数的情况下，零频率丢失。
The Fourier transform method has been used to analyze the influence of modal amplitude and phase fluctuations in a mode-locked laser on performance of its output pulse.
用傅里叶变换的方法分析了锁模激光器中模式间的相位和振幅涨落对锁模脉冲列特性的影响。
A new optical image encryption method using anamorphic fractional Fourier transform and double random phase encoding is proposed.
提出一种利用变形分数傅里叶变换和双随机相位编码对图像加密的方法。
Results of analysing Doppler signals simulated using this method with the short time Fourier transform show agreement with the theoretical prediction.
利用短时傅里叶变换分析以这种方法合成的模拟多普勒信号，实验的结果和理论基本吻合。
All this method is based on Fourier transform.
这个方法是以富氏变换为基础。
A new optical image encryption method using dissymmetrical fractional Fourier transform and double random phase encoding was presented.
提出了一种利用不对称分数傅里叶变换和双随机相位编码对图像加密的方法。
The fundamental limitations that lower the accuracy of Fourier transform method are examined, and improving approaches are discussed correspondingly.
重点讨论了对傅里叶变换法的精度限制因素，并总结了对其改进的各种途径。
A method for storage of color films using Fourier transform holograms isp resented.
本文提出一种利用傅里叶变换全息图存储彩色胶片的方法。
In chapter two, a new method which combines Fourier transform smoothing with ratio spectra derivative has been developed for analysis of binary or ternary mixtures.
在第二章中，针对两组分和三组分混合体系分析问题提出了傅立叶变换平滑比光谱导数的新方法。
The Fourier transform is a classical method for analyzing signal singularities.
傅立叶变换是分析信号奇异性的传统方法。
Local Fourier transform (LFT) is an important texture feature extracting method.
局部傅里叶变换(LFT)是一种重要的纹理特征提取方法。
Using statistics method, Fourier transform infrared (FTIR) spectroscopy was applied to the study of the spectrum of the powder of cancerous tissues and normal tissues near the cancer of the lung.
使用统计的方法，应用傅里叶变换红外光谱法对肺癌及癌旁正常组织粉末样品的红外光谱进行了统计分析。
This method can be used to measure similar objects with the regular Fourier transform spectrum (FTS).
该方法可用于能够产生规则傅里叶变换频谱的所有被测物体的几何量。
Secondly, a DSTFT(Discrete Short Time Fourier Transform )-based demodulation method for the 2FSK signal is studied and algorithms for symbol synchronization and symbol decision are analysed.
重点研究了基于离散短时傅里叶变换解调2FSK信号的方法，分析了几种码元同步算法和码元判决算法。
The conjugate gradient method (CGM) and fast Fourier transform (FFT) technique are used to reduce the necessary memory and CPU time.
在求解过程中应用共轭梯度法(CGM)和快速傅立叶变换(FFT)相结合的方法降低所需计算机内存和CPU时间。
Based on Fourier transform, short time Fourier transform and Wavelet transform, a realizing method of system software module of Virtual signal analysis instrument is proposed.
基于傅立叶变换、短时傅立叶变换和小波变换，提出了一种虚拟信号分析仪的系统软件模块的实现方法。
The processing speed of the fringe subdivision method based on Fourier transform is between that of the first method and the second method.
基于傅立叶变换的条纹细分法，其处理速度介于前面两种细分方法之间。
According to the shortcomings of traditional time domain Fourier transform, one new method of Angle domain Fourier transform is put forward at first time, and theoretical formulas are deduced.
针对传统时域傅立叶变换方法的缺点，笔者首次提出了一种从角域到倒角域的傅立叶变换方法，并推导了该变换的理论公式。
The paper presents a method of motion curve frequency domain filtering in Omni-directional M-mode echocardiography images based on Discrete Fourier Transform (DFT).
介绍一种基于离散傅里叶变换(DFT)的全方向M型超声心动图运动曲线频域滤波技术。
By using Fourier transform method, the Green function of a point harmonic force applied at a bi-material plane is obtained.
利用积分变换方法得出了两相材料中作用简谐集中力时的格林函数。
To work out the wavefront accurately, we modulate it on a carrier frequency. The wavefront can be worked, using the Fourier Transform method on the interferogram.
为了准确求解波面，我们将其调制在一载频条纹上，利用傅立叶变换方法对条纹图进行处理后，解出干涉图所代表的波面。
Compared with traditional inverse Fourier transform method, which used zeros padding method, at the same condition of sampling resolution, the method proposed could decrease the calculation load.
与传统的数据长度补零逆傅里叶变换方法相比，在相同的采样分辨率条件下，该方法能有效减小计算量。
In that case, Fourier transform system with long focal length and high power lens and method of linear decision are proposed.
以肺癌细胞筛选为例，提出用长焦距、高倍率的傅里叶变换系统和线性判别处理。
This paper mainly expound the encoding and decoding principle of Q - ary LDPC codes, and introduce a Fourier transform decoding method with low complexity.
本文主要阐述了多进制ldpc码的编译码原理，并介绍了一种可简化译码的傅立叶变换译码算法。
At present, phase shifting method, Fourier transform method and fringe skeleton method are three most important fringe analysis methods.
目前，相移法、傅立叶变换法和条纹骨架法是三种主要的提取相位的方法。
Fast Fourier Transform (FFT) is a kind of fast computation method of Discrete Fourier Transform (DFT).
快速傅里叶变换(FFT)是离散傅里叶变换(DFT)的快速算法。
In addition, the Fourier transform method for solving PDE is introduced in Appendix, as well as the numerical algorithm used in the TPM and CTPM.
此外，本文还在附录里介绍了求解偏微分方程的傅立叶变换法，以及TPM和CTPM中的相关数值算法。
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