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快速傅立叶变换的
相关语句
  fast fourier transform
     By summing up the advantages of wavelet transform and fast Fourier transform and utilizing the sensitivity of wavelet to unstable signal,flicker signal detecting method based on wavelet spotting is proposed and its feasibility is determined by means of MATLAB simulation.
     综合小波变换和快速傅立叶变换的优点,利用小波对非稳定信号的敏感性,提出了基于小波测位的闪变信号检测方法,并通过MATLAB进行仿真,确定了该方法的可行性。
短句来源
     Baseline Estimation of Interferometric SAR Based on Fast Fourier Transform
     基于快速傅立叶变换的干涉SAR基线估计
短句来源
     According to the requirement of the National Natural Science Foundation“Research of the self-operation and collision avoidance fuzzy theory for robots based on sensitive skin”, a novel hardware system structure based on DSP+FPGA is designed to process the sensors signal of robotic sensitive skin, and spectrum analysis method based on Fast Fourier Transform is used for analyzing the signal.
     本文结合国家自然科学基金项目“基于传感皮肤的机器人自主模糊避碰运动方法研究”,根据机器人敏感皮肤系统的具体要求,设计了基于DSP+FPGA的机器人敏感皮肤信号处理系统,并采用基于快速傅立叶变换的谱分析方法对信号进行处理。
短句来源
     Secondly,the sub-function blocks of FFT(Fast Fourier Transform)are finished in MAX+PLUS II softwareplatform,and each of them has been designed carefully and simulated in the software.
     然后用MAX+PLUSⅡ软件平台编程实现快速傅立叶变换的各个软件模块,并进行了大量的逻辑设计和软件仿真。
短句来源
     This paper introduces the principle of discrete fourier transform and fast fourier transform, expatiates a phenomenon of frequency mixing caused by low sampling frequency with a Matlab example, and proposes the necessity of sampling frequency in FFT.
     首先介绍了离散傅立叶变换及快速傅立叶变换的基本原理,然后通过一个Matlab实例说明快速傅立叶变换由于采样频率低引起的“频率混迭”现象,提出了快速傅立叶变换对采样频率的要求。
短句来源
更多       
  fast fourier transformation
     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
  fast fourier trans form
     By summing up the advantages of wavelet transform and fast Fourier transform and utilizing the sensitivity of wavelet to unstable signal,flicker signal detecting method based on wavelet spotting is proposed and its feasibility is determined by means of MATLAB simulation.
     综合小波变换和快速傅立叶变换的优点,利用小波对非稳定信号的敏感性,提出了基于小波测位的闪变信号检测方法,并通过MATLAB进行仿真,确定了该方法的可行性。
短句来源
     Baseline Estimation of Interferometric SAR Based on Fast Fourier Transform
     基于快速傅立叶变换的干涉SAR基线估计
短句来源
     According to the requirement of the National Natural Science Foundation“Research of the self-operation and collision avoidance fuzzy theory for robots based on sensitive skin”, a novel hardware system structure based on DSP+FPGA is designed to process the sensors signal of robotic sensitive skin, and spectrum analysis method based on Fast Fourier Transform is used for analyzing the signal.
     本文结合国家自然科学基金项目“基于传感皮肤的机器人自主模糊避碰运动方法研究”,根据机器人敏感皮肤系统的具体要求,设计了基于DSP+FPGA的机器人敏感皮肤信号处理系统,并采用基于快速傅立叶变换的谱分析方法对信号进行处理。
短句来源
     Secondly,the sub-function blocks of FFT(Fast Fourier Transform)are finished in MAX+PLUS II softwareplatform,and each of them has been designed carefully and simulated in the software.
     然后用MAX+PLUSⅡ软件平台编程实现快速傅立叶变换的各个软件模块,并进行了大量的逻辑设计和软件仿真。
短句来源
     This paper introduces the principle of discrete fourier transform and fast fourier transform, expatiates a phenomenon of frequency mixing caused by low sampling frequency with a Matlab example, and proposes the necessity of sampling frequency in FFT.
     首先介绍了离散傅立叶变换及快速傅立叶变换的基本原理,然后通过一个Matlab实例说明快速傅立叶变换由于采样频率低引起的“频率混迭”现象,提出了快速傅立叶变换对采样频率的要求。
短句来源
更多       
  “快速傅立叶变换的”译为未确定词的双语例句
     The whole 128-point FFT system can be integrated in the Altera's FLEX1K100 chip,and the data width is 16 bits.
     选用Altera公司的1k100高密度可编程逻辑器件实现128点16位的快速傅立叶变换的单片集成。
短句来源
     The conventional harmonic measurement methods cause aliasing and spectral leakage, so the measurement accuracy is not high.
     传统的谐波测量方法产生频谱混叠和频率泄漏 ,测量精度不高 ,这是一系列窗函数和快速傅立叶变换的主要缺点。
短句来源
     Roll eccentricity compensation control based on FFT
     基于快速傅立叶变换的轧辊偏心补偿控制
短句来源
     Based on FFT, the DSP spectrum analysis system of arc voltage is set. Pretreatment circuit of the short circuit signal detection of CO_2 welding is designed.
     其次建立基于快速傅立叶变换的DSP信号频谱分析系统,实时分析弧焊电源的电弧电压信号的频谱特征,据此设计短路信号检测系统的信号预处理电路,为短路信号检测提供了既滤除了干扰信号又保留了信号细节的电弧电压信号。
短句来源
     This paper discusses the method which uses FFT to extract hydraulic AGC roll eccentricity signal based on FFT. Depending on this detected signal,control the system of mill press control and effectively compensate the thickness variation of the strip.
     该文提出了基于快速傅立叶变换的轧辊偏心补偿控制的解决方案,论述了用快速傅立叶变换法提取液压AGC系统轧辊偏心基波信号的方法,并以此信号为依据,控制轧机的压下系统,实现对轧辊偏心的有效补偿,在实际应用中取得了很好的效果。
短句来源
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  fast fourier transform
This article genralizes the fast Fourier transform algorithm to the computation of Fourier transforms on compact Lie groups.
      
These results may all be viewed as generalizations of the fast Fourier transform algorithms on the circle, and of recent results about Fourier transforms on finite groups.
      
Spherical harmonic series have many of the same wonderful properties as Fourier series, but have lacked one important thing: a numerically stable fast transform analogous to the Fast Fourier Transform (FFT).
      
In this article we describe a non-equispaced fast Fourier transform.
      
Moreover, the approach is more computationally efficient for there are no time-consuming correlations or fast Fourier transform (FFT) operations needed in the range-Doppler domain and only part of the range cells are used in the calculation.
      
更多          
  fast fourier transformation
The algorithm for determining the LIS consists in obtaining, by double fast Fourier transformation, a high-resolution image filtered by selecting an appropriate combination of reflections and using this image to find the characteristic LIS.
      
The focusing of the synthetic-aperture radar is based on fast Fourier transformation providing a fast algorithm of 3D reconstruction.
      
The influence of inter-and intra-hemispheric coherence on EEG activity with eyes closed was examined using fast Fourier transformation from the 16 sampled channels.
      
The equidistant sampling allowed a direct spectral analysis using a fast Fourier transformation algorithm.
      
Cardiac BRS was measured by power spectral analysis using Fast Fourier Transformation (FFT), sequence analysis (using up, down and combined sequences) and from phase IV of the Valsalva manoeuvre.
      
更多          
  fast fourier trans form
Individual resonance modes of the liquid column, the gas column, and the two-phase coupled fluid are resolved in the fast Fourier trans form acoustic-resonance spectrum (FFT-ARS).
      


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,...

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。

Field measurement of sea wave with an acoustic wave recorder was made during an underwater acoustic experiment in Yellow Sea in September 1980.Data was analysed by means of F.F.T. and the spectrum of sea wave was thus obtained。 Analysis of the probability distribution of wave heights and periods show that wave heights fit the Rayleigh distribution and wave periods approximates the normal one。

应用声学测波仪在黄海配合水声物理实验进行了海浪现场测量。对记录数据作快速傅立叶变换分析,获得了海浪谱。我们还进行了波高和周期的概率分布分析,说明波高符合瑞利分布,周期接近正态分布。

During the recent years, the information science has been developing by leaps and bounds. One problem of importace to improve the speed of processing. As is well known, the essential tool is the method of FFT. In this paper, an ingenious and time-saving hardware implementation of FFT is recommended. Orders of magnitude of speed improvement is achieved. Fundamental principle, equations of transformation and, in particular, the circuit configuration and the time of transformation are discussed in detail.Also,...

During the recent years, the information science has been developing by leaps and bounds. One problem of importace to improve the speed of processing. As is well known, the essential tool is the method of FFT. In this paper, an ingenious and time-saving hardware implementation of FFT is recommended. Orders of magnitude of speed improvement is achieved. Fundamental principle, equations of transformation and, in particular, the circuit configuration and the time of transformation are discussed in detail.Also, the application of the multiplication accumulator is discussed.lt is a multiplication arithmetic unit capable cf performing 12×12 multiplication as well as product accumulation.It has an additional feature of permiting the accumulator contents to be subtracted from the next product instead of being added, if desired.Input registers are provided in additon to the product accumulation register. The multiplication accumulator is the central part of the FFTs.

本文从快速傅立叶变换(FFT)出发,介绍一种变换速度更高的快速傅立叶变换新方法,并对一种小型快速傅立叶变换器的基本原理、变换方程式、特别是电路结构和变换时间等问题进行了讨论。

 
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