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fast fourier transformation     
相关语句
  快速傅里叶变换
     Signal Recognition Ability Analyses of Fast Fourier Transformation
     快速傅里叶变换信号识别能力分析
短句来源
     For a simple pole system with frequency 160THz and quality factor of 5000,the intensity spectrum obtained by the Padé approximation from a 2~8-item sequence output is more exact than that obtained by fast Fourier transformation from a 2~(20)-item sequence output.
     对频率为160THz,品质因子为5000的简单谐振子,结果显示Pad啨近似用28时间步数据得到的强度谱比快速傅里叶变换用220时间步数据得到的强度谱更精确.
短句来源
     With these initial values on the continuing horizontal plane,the potential field on the original plane is calculated using the Fast Fourier Transformation(FFT).
     根据该水平面上的初始值,用快速傅里叶变换(FFT)的方法向上延拓计算观测面上的位场值.
短句来源
     Fast Fourier transformation, node positions, as well as numerical simulations, are used to deduce the Rashba spin-orbit splitting an d result in an excellent agreement in Rashba spin splitting energy (28-36?meV).
     发现在量子阱中电子存在强烈的Rashba自旋分裂 ,通过对SdH振荡进行三种不同方法的分析 :SdH振荡对 1 B关系的快速傅里叶变换、SdH振荡中拍频节点分析和对SdH振荡拍频数值拟合 ,得到了完全一致的电子Rashba自旋分裂能量 (2 8— 3 6meV)
短句来源
     Meanwhile the software solutions for capturing Moire fringes image, controlling planar scanning system and calculating the angle value of Moire fringes are discussed, especially for the algorithms of Fast Fourier Transformation (FFT) and the acquisition of maximum position improved, which are used in the calculation of fringes' angle.
     同时,本文也对软件如何采集Moiré条纹图像、如何控制二维扫描平台以及如何计算Moiré条纹角度进行了阐述,并且对实现角度计算的快速傅里叶变换(FFT)算法和极点位置改进算法进行了详细分析。
短句来源
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  快速傅立叶变换
     In most programming languages, the adopted forms of fast Fourier transformation and inverse transformation are opposite to the forms adopted in nonlinear optics.
     而在大多数编程语言中其快速傅立叶变换正逆变换形式是与非线性光学中应采用的傅立叶变换正逆形式恰好相反,因此时而出现一些错误的计算结果.
短句来源
     Afterward, we chiefly introduce Monte Carlo method and fast Fourier transformation and micromagnetism (FFTM).
     然后重点介绍了蒙特卡罗方法和快速傅立叶变换微磁学方法。
短句来源
     Fast Fourier transformation is an effective, practical DFT algorithm.
     快速傅立叶变换是一种有效、实用的信号DFT算法。
短句来源
     This paper also introduces the iterative algorithms combined with the Nonuniform fast Fourier transformation(NUFFT) algorithm developing recently to solve the electromagnetic field integral equation.
     本文还介绍迭代算法结合近来发展的不等间距快速傅立叶变换算法(NUFFT)求解电磁场积分方程。
短句来源
     After fast Fourier transformation,the noisy current can be differentiated and be used to determine its density distribution.
     在数据处理中 ,采用了快速傅立叶变换滤波的办法来消除微小电流测量结果中的噪声 ,从而可以对S形电流曲线进行微分 ,得到束流密度空间分布。
短句来源
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  快速fourier变换
     HREM and fast Fourier transformation further indicate that the structure of annealed Zr(Cr,V)_2 is C36(4H)combined with 8H and other transitional multilayer stacking structure. The effect of V on the stability of ZrCr_2 Laves phase was also discussed.
     高分辨电镜和快速Fourier变换分析证明,退火态Zr(Cr,V)_2长周期结构为C36(4H)结构,同时存在8H堆垛结构和少量其它过渡性多层堆垛结构.并就合金元素V对ZrCr_2 Laves相稳定性的影响进行了讨论.
短句来源
     This paper firstly introduces the knowledge of Fast Fourier Transformation(FFT),then mostly discusses how to analyze the spectrum of a signal by using FFT, through a example, on the platform of LabVIEW8.0.
     本文先介绍了快速Fourier变换FFT的有关知识,而后主要通过一个实例详细论述了如何在LabVIEW8.0平台下利用FFT进行信号的频谱分析。
短句来源
     This article makes use of the fast Fourier transformation in dealing with MATLAB digital signals to carry out spectrum analysis of the P wave and LG wave of the earthquake of magnitude 6.1 in Dayao,Yunnan and finds out its advantage frequency and attenuation.
     本文运用MATLAB数字信号处理中的快速Fourier变换,对青海湟源地震台记录的云南大姚6.1级地震的P波和LG波进行频谱分析,找出其优势频率及衰减情况;
短句来源
     Fast Fourier transformation (FFT) and inverse fast Fourier transformation (IFFT) further show the periodicity of stacking faults.
     STM图象的快速Fourier变换(FFT)及逆变换(IFFT)结果表明,层错排列具有一定周期性。
短句来源
     In view of the effect of frequency-selective fading of ultra-wide band and carrier jitter on the performance of the system of multi-band orthogonal frequency-division multiplexing ultra-wide band(MB-OFDM-UWB),this paper proposes a scheme that uses filter bank to realize fast Fourier transformation(FFT) of the OFDM system. The complexity of the system is reduced by optimizing the structure of the filter and algorithm of the prototype filter.
     鉴于超宽带(UWB)信道频率选择性衰落和载波抖动对多带正交频分复用UWB(MB-OFDM-UWB)系统性能的影响,提出了利用滤波器组技术实现OFDM系统中快速Fourier变换(FFT)的方案,并对滤波器的实现结构、原型滤波器的算法进行优化,降低了系统实现的复杂性.
短句来源
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  快速傅立叶变换的
     A FAST FOURIER TRANSFORMATION BASED SECOND ORDER RELIABILITY METHOD
     基于快速傅立叶变换的二阶可靠度分析方法
短句来源
     Defining the correlation function for nucleotide sequences,the power spectrum of nucleotide sequences is investigated by Fast Fourier Transformation method. The result shows that the power spectrum of base correlation at low frequencies can be approximated by 1/f α.
     定义了核酸序列的关联函数,并用快速傅立叶变换的方法求出了核酸序列的碱基关联功率谱.结果发现:功率谱的低频端具有1/fα涨落.对于大部分包含关联长周期的序列,α的值在1和2之间;
短句来源
     In order to increase computation speed and accuracy of transient response,the algorithms based on fast Fourier transformation were constructed, and the essence of the algorithms were also explored.
     为了提高瞬态响应的计算速度和精度,构造了基于快速傅立叶变换的响应计算格式,并研究了这种格式的本质。
短句来源
     A fast Fourier transformation based second order reliability method (FFT SORM) is proposed.
     建立了一种基于快速傅立叶变换的二阶可靠度分析方法 .
短句来源
     A calculation method based on fast Fourier transformation and micromagnetism(FFTM) is presented.
     提出了一种具有快速傅立叶变换的微磁学(FFTM)方法,并应用于二维纳米磁性系统.
短句来源

 

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      fast fourier transformation
    The radar cross section (RCS) is then evaluated with the equivalence principle and Fast Fourier Transformation (FFT).
          
    The formed patterns demonstrate an excellent hexagonal order and uniformity according to fast Fourier transformation performed.
          
    Nevertheless, using the Fast Fourier Transformation, the resolution capability for closely spaced targets is limited and directly related to the employed signal bandwidth.
          
    In the introductory part of the paper, a method of computing spectra by computer is described, which cuts down the computer time required without using the Fast Fourier Transformation.
          
    A transfer function describing the flow of grain within a conventional combine harvester was used to deconvolve the recorded signal using Fast Fourier Transformation (FFT).
          
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    To obtain the tomograph of body tissues by ultrasonic echoes and then to improve the quality of images by digital processing method is one of the important techniques of medical diagnosis. The digital processing methods of ultrasonic medical images are reviewed in this paper. (a), Digital filtering technique. The accumulative average, low-pass, high-pass, notch filtering and band-pass of the medical ultrasonic informations may be realized by linear digital filters. The real time processing can be realized by...

    To obtain the tomograph of body tissues by ultrasonic echoes and then to improve the quality of images by digital processing method is one of the important techniques of medical diagnosis. The digital processing methods of ultrasonic medical images are reviewed in this paper. (a), Digital filtering technique. The accumulative average, low-pass, high-pass, notch filtering and band-pass of the medical ultrasonic informations may be realized by linear digital filters. The real time processing can be realized by using the Discrete Fourier Transformation (DFT) and the Fast Fourier Transformation(FFT). The distortion of the ultrasonic informations produced by the filtering effect of the body tissues may be corrected by inverse filtering or deconvolution. Algorithm with "template" is a convenient and flexible method. In addition, non-linear filtering technique such as homomorphic filters may also be used to improve the quality of the images. (b), Image enhancement technique. Histogram equalization, non-linear stretching, interpolation, pseudo-coloring methods etc. may be used for image-enhancement. In addition, it is possible to raise the diagnostic precision by using the edge detection and contour tracing methods. (c), Ultrasonic Computerized-Tomograph (UCT). This is a new ultrasonic image processing method. While still in the laboratory stage, it calls for close attention.

    利用超声回波作人体组织的断层显象并用数字处理方法提高成象质量是诊断医学的重要技术之一。本文综述了超声图象的数字处理方法。(一)数字滤波技术。采用线性数字滤波器可以实现对超声图象信息的累加平均、低通、高通、陷波和精通。采用离散宫氏变换(DFT)及快速富氏变换(FFT)可进行实时处理。应用反滤波或反卷积可以使超声信息受人体组织作用产生的畸变得到校正。采用模板运算是一种方便、灵活的方法。此外,还可以采用如同形态滤波器等非线性滤波技术来改善图象质量。(二)图象增强技术。可以采用直方图均衡、非线性伸展、内插补技术、伪着色等方法以增强图象。此外还可以采用边沿测量及轮廓追述的方法来提高确诊率。(三)应用计算机的超声断层显象。这是一种新的超声图象处理方法,尚在实验室研究阶段,但值得重视。

    In this paper the concept of circulant matrix is generalized, the properties of circulant matrices discussed, and a computation method developed. Systems of linear algebraic equations with circulant or quasi-circulant coefficient matrices can be solved by the method mentioned. For most types of structures such systems of equations are often met in computation, Compared to the existing methods of solution, the proposed method involves less arithmetic computation and smaller digital computer storage. Furthermore...

    In this paper the concept of circulant matrix is generalized, the properties of circulant matrices discussed, and a computation method developed. Systems of linear algebraic equations with circulant or quasi-circulant coefficient matrices can be solved by the method mentioned. For most types of structures such systems of equations are often met in computation, Compared to the existing methods of solution, the proposed method involves less arithmetic computation and smaller digital computer storage. Furthermore it permits the use of Fast Fourier Transformation (FFT), with a result that the speed of computation can be greatly increased.

    本文推广了循环矩阵的概念,讨论了它的一般性质,并提出了一种解系数矩阵为循环矩阵或准循环矩阵的线性代数方程组(这种方程组在一大类常见的结构物的计算中出现)的方法,这种解法比通常解法计算量小而且节省存储,同时还允许应用快速富氏变换以增怏其计算速度。

    Convolution filter is a method commonly used in seismic data processing. Because of the vast amount of seismic data and the long convolution filter factors, some difficulties might be brought up as the convolution calculation is carrying out in time domain. Right after the appearence of the Fast Fourier Transformation (FFT) , was the convolution calculation run from time domain to frequency domain. This is the so called"Fast Convolution Filter". The way of doing the calculation is, to speak in concrete...

    Convolution filter is a method commonly used in seismic data processing. Because of the vast amount of seismic data and the long convolution filter factors, some difficulties might be brought up as the convolution calculation is carrying out in time domain. Right after the appearence of the Fast Fourier Transformation (FFT) , was the convolution calculation run from time domain to frequency domain. This is the so called"Fast Convolution Filter". The way of doing the calculation is, to speak in concrete terms, to carry out the FFT for the seismic data x(t) and the filter factor h(t) respectively for the purpose of changing them into the seismic frequency spectrum X(f) and the frequency spectrum of filter factor H(f), to multiply X(f) by H(f), then, carrying out the inverse transformation of FFT for the product, the convolution calculation thus accomplished.

    褶积滤波是地震资料处理中的常用方法,但由于地震数据的数量一般较大,而褶积滤波因子通常又较长,这就给在时间域进行褶积运算带来一定的困难。快速傅立叶变换(FFT)出现之后,人们就把褶积运算从时间域搬到频率域进行,这就是所谓的“快速褶积滤波”(快速相关亦然)。在这个运算过程中所进行的正向和反向傅立叶变换,实质上是一系列包括三角函数在内的复数运算。由于复数运算比实数运算复杂,又需要存放三角函数的地方,并存在舍入误差等不足。因此,近年来在国外和国内一些部门,针对FFT存在的不足之处,开展了所谓“数论变换”的研究,取得了一定的成效。 本文首先简要地介绍一下“数论变换”,然后用数论变换方法,对地震数据进行快速褶积滤波作初步的探索,最后对结果提出了一些看法。

     
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