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快速傅立叶
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  fast fourier
     Accomplishment of Fast Fourier Transform in TMS320F206
     快速傅立叶变换(FFT)在TMS320F206上的实现
短句来源
     Origin data analysis included simple math, statistics, fast fourier transform, data smoothing and filtering.
     Origin数据分析简单数学运算,统计分析,快速傅立叶变换,数据平滑和滤波,基线和峰值分析等强大的分析工具;
短句来源
     Next, Fast Fourier Transform Algorithm, i_p,i_q Algorithm and Spectrum Estimation in harmonics detection of separate frequency.
     然后,介绍了常用的谐波检测方法,具体分析了快速傅立叶变换,提出了基于i_p,i_q的谐波分频检测方法,对比了基于谱估计的谐波检测方法;
短句来源
     Algorithm Research and Design of Fast Fourier Transform
     快速傅立叶变换算法研究与设计
短句来源
     Outline of Fast Fourier Transform Algorithm
     快速傅立叶变换算法概述
短句来源
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  a fast fourier
     The standard method for spectrum analysis in digital signal processing is the discrete Fourier transform(DFT), typically implemented using a fast Fourier transform(FFT) algorithm.
     数字信号处理中标准的频谱分析方法是离散傅立叶变换(DFT),典型的实现方法是快速傅立叶变换(FFT)。
短句来源
     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
     This paper proposes a Fast Fourier transform (FFT) based algorithm to compute the desired signal phase in noisy environments for implementing adaptive directionality of dual microphone application systems such as wireless communications.
     提出一种基于快速傅立叶变换(FFT)的算法来计算噪声环境中的有用信号相位,可用于无线通信中双传声器应用系统中的自适应定向。
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
     Then with a Fast Fourier Transform (FFT),the FDTD result is transformed to the frequency domain.
     运用FDTD算法建立起树干散射模型后 ,经过计算 ,可以得到整个时域过程的散射 ,对时域散射场进行快速傅立叶变换 (FFT) ,则可获取全部感兴趣的超宽带频域特性 .
短句来源
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  fast fourier translation
     The Particle Image Velocimetry Technique Based on Fast Fourier Translation
     基于快速傅立叶变换的粒子图像测速技术
短句来源
     After average of power noise spectrum and fast Fourier translation, the power density spectrum of non-stationary shot noise is measured effectively, and the phase dependence characteristic of non-stationary shot noise is proved.
     通过对噪声功率谱的多次平均和快速傅立叶变换,有效地测量了非稳散粒噪声的频谱特性,研究结果表明非稳散粒噪声具有确定的相位依赖特性。
短句来源
     On the basis of image cross correlation of brightness distribution and Fast Fourier Translation, the implementation of Particle Image Velocimetry was studied.
     在图像灰度分布互相关和快速傅立叶变换的基础上,研究了粒子图像测速的实现。
短句来源
     the Particle Image Velocimetry technique based on Fast Fourier Translation can detect flow-field effectively and quickly;
     基于快速傅立叶变换的粒子图像测速技术能够有效、快速检测出流场;
短句来源
  “快速傅立叶”译为未确定词的双语例句
     The dynamic strain induced wavelengthshift in phaseshifted fiber Bragg grating is investigated by use of unbalanced MachZehnder interferometer and a strain resolution of 2.1×10-2με(where 1με is a strain of 1 part in 106) at 2.1kHz (5kHz bandwidth) is achieved. 
     用非平衡Mach-Zehnder干涉仪检测动态应变在相移光纤光栅中感生的波长变化,对2.1kHz信号进行FFT(快速傅立叶变换)频谱分析得到了2.1×10-2με(1με=1×10-6应变)的应变分辨率(信号分析带宽5kHz)。
短句来源
     FFT Processor Design Based on FPGA
     基于FPGA的快速傅立叶变换(FFT)处理器的设计
短句来源
     The results of performance analysis of an 8-point asynchronous FFT processor show that the average case response time 31.15 ns is only 72.7% the worst-case response time 42.85 ns.
     通过对一个8点的异步快速傅立叶变换处理器电路仿真,得到该处理器的平均响应时间为31.15 ns,仅为最差响应时间42.85 ns的72.7%.
短句来源
     Numerical Solution of Fokker-Planck-Landau Equation by FFT Technique
     快速傅立叶变换用于Fokker-Planck-Landau方程的数值求解
短句来源
     Using Mallat algorithm on the basis of wavelet transform and multiresolution analysis(MRA) in connection with traditional FFT,a new speech signal fundamental frequency detection method is presented.
     将基于小波变换与多分辨分析 (MRA)下的Mallat算法与传统的快速傅立叶变换(FFT)相结合 ,提出了一种新的语音信号的基音频率检测方法。
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  fast fourier
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          
  a fast fourier
A Fast Fourier Transform (FFT)-based algorithm is used to obtain the estimate of the uplink multi-user space-time channels.
      
The equidistant sampling allowed a direct spectral analysis using a fast Fourier transformation algorithm.
      
The equidistant sampling allowed a direct spectral analysis using a fast Fourier transform algorithm.
      
Antenna far-field pattern is directlyevaluated from complex near-field helicoidal data by a Fast Fourier Transform based algorithm, so anyintermediate interpolation on a cylindrical surface is avoided.
      
CBF was determined photometrically, the signal being subjected to a fast Fourier transformation.
      
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From the point of view of fracture mechanics, we studied the far displacement field produced by a disk-shaped pure shear fracture and obtained an analytic expression for that field. Then, by using this expression we calculated the form of the impulse and its spectrum and found a relation between the corner frequencies fcα,fcβ of the P and 8 waves and the fracturing radius of the earthquake focus, i.e. fcα = 0.6/t2α = 0.6/al/vr + π/4α) and fcβ = 0.45/t2β = 0.45/a(1/vr + β/4β), where t2α and t2β are respectively...

From the point of view of fracture mechanics, we studied the far displacement field produced by a disk-shaped pure shear fracture and obtained an analytic expression for that field. Then, by using this expression we calculated the form of the impulse and its spectrum and found a relation between the corner frequencies fcα,fcβ of the P and 8 waves and the fracturing radius of the earthquake focus, i.e. fcα = 0.6/t2α = 0.6/al/vr + π/4α) and fcβ = 0.45/t2β = 0.45/a(1/vr + β/4β), where t2α and t2β are respectively the average values on the focal sphere of the impulse widths of the earthquake focus of the P and S waves, vr is the velocity of fracturing, taking as 0.775 β;α,β are the velocities of the P and 8 waves. In neglecting the delay factor of theray paths e-iwr/c, the effect of the absorption of the media resembles a minimum phase-shift filter. Employing Hilbert Transform, the frequency response .B(w) =exp of the media was found, in which t*=r/CQ, where r, the distance from the earthquake focus; c, velocity of waves; Q, quality factor of the media and wm, the high cut frequency. This expression is different from that of Futterman. After taking into consideration of the effect of the absorption of the media and the frequency characteristics of the instruments, the earthquake focal dimension 2a and the seismic moment M0 in the frequency domain were obtained. While in the time domain, fast Fourier Inverse Transform was used to get the impulse response of the media and the instruments and then convolved with the impulse of the earthquake focus to construct the synthetic seismogram. From it we can get the relation between the initial half period T2P and the dimension 2a or impulse width t2α of the earthquake focus. Then draw the nomogram for this relation. From the nomogram we can get 2a, the focal dimension. The value is essentially the same as that obtained in the frequency domain.Based on the relation Ms = 21og(2a) +1/1.5, as the outcomeof the study of fracture processes of the earthquake focus in the light of frecture mechanics, we were able to find the regional shear stressτ0 of the Peking-Tientsin-Tangshan-Zhangjiakou area. Here, η, efficiency of rediation of the earthquake, taking as 0.05: v, Poisson Eatio, taking as 0.252; μ, rigidity modulus, taking as 3.3 1011 dyne/cm2. Computations show that before the Tangshan Earthquake of July 28, 1976, the stress value of the Tangshan-Fengnan area was the highest, reaching a value of 870 bars. But in the Changli area, at a distance of about 100 km away, the stress had a value of only 200 bars. After the Tangshan Earthquake, in the Tangshan-Fengnan area, located in the central portion of the earthquake fault zone, To dropped to 100 bars. However, at both ends of the fault zone, the stress was still very high in value, especially at the southwestern end, in the vicinity of Ninghe, the stress value there was 400-500 bars. Until November 15, 1976, a strong aftershock of magnitude 6.9 occurred here, after which the stress value decreased to 200 bars.

作者从断裂力学观点研究了圆盘形纯剪切破裂产生的远场位移,导出了远场位移的解析表达式.用此表达式计算了远场位移脉冲波形及其谱.求得了P波和S波拐角频率F_(cα)、f_(cβ)与震源破裂半径的关系式,t_(2α)和t_(2β)分别是P波与S波的震源脉冲宽度在震源球上的平均值.V_r是破裂速度,取0.775β,α、β是P波与S波速度.介质吸收的影响,假定在略去路径滞后因子e-(iωr)/c后是最小相移滤波器,应用希尔伯特(Hilbert)变换导出了介质的频率响应公式式中,r为震源距,c为波速,Q为介质品质因数,ω_m为高频截止频率.它与富特曼(Futterman)公式是不一样的.在考虑了介质吸收影响与仪器频率特性影响后,在频率域中求出了震源尺度2a和地震矩M_0.在时间域中,利用快速傅立叶反变换求出介质和仪器的脉冲响应后与震源脉冲折积,求得了合成地震图,用此图得到了地震图初动半周期T_(2P)与震源尺度2a或震源脉冲宽度t_(2a)之间的关系量板.用此量板在时间域中也求得震源尺度2a,与频率域中求得的结果基本一致. 利用从断裂力学观点研究震源破裂过程导出的关系式求出了京津唐张地区的区域剪切应力τ_0,...

作者从断裂力学观点研究了圆盘形纯剪切破裂产生的远场位移,导出了远场位移的解析表达式.用此表达式计算了远场位移脉冲波形及其谱.求得了P波和S波拐角频率F_(cα)、f_(cβ)与震源破裂半径的关系式,t_(2α)和t_(2β)分别是P波与S波的震源脉冲宽度在震源球上的平均值.V_r是破裂速度,取0.775β,α、β是P波与S波速度.介质吸收的影响,假定在略去路径滞后因子e-(iωr)/c后是最小相移滤波器,应用希尔伯特(Hilbert)变换导出了介质的频率响应公式式中,r为震源距,c为波速,Q为介质品质因数,ω_m为高频截止频率.它与富特曼(Futterman)公式是不一样的.在考虑了介质吸收影响与仪器频率特性影响后,在频率域中求出了震源尺度2a和地震矩M_0.在时间域中,利用快速傅立叶反变换求出介质和仪器的脉冲响应后与震源脉冲折积,求得了合成地震图,用此图得到了地震图初动半周期T_(2P)与震源尺度2a或震源脉冲宽度t_(2a)之间的关系量板.用此量板在时间域中也求得震源尺度2a,与频率域中求得的结果基本一致. 利用从断裂力学观点研究震源破裂过程导出的关系式求出了京津唐张地区的区域剪切应力τ_0,式中η为地震辐射效率,取0.05;v为泊松比,取0.252;μ为刚性模量,取3.3×10~(11)达因/厘米~2.结果表明,1976年7月28日唐山大震前,唐山—丰?

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。

A method based on the Fourier analysis, using FFT technique to calculate the switching overvoltage in UHV power transmission system has been introduced in the present paper. In this calculation, a poly-phase n--network model was adopted to represent the actual network. The Fourier analysis enables that the frequency dependence of the network parameters can be easily taken into consideration, and the application of FFT technique greatly saves the computing time. This method has been applied to calculate the...

A method based on the Fourier analysis, using FFT technique to calculate the switching overvoltage in UHV power transmission system has been introduced in the present paper. In this calculation, a poly-phase n--network model was adopted to represent the actual network. The Fourier analysis enables that the frequency dependence of the network parameters can be easily taken into consideration, and the application of FFT technique greatly saves the computing time. This method has been applied to calculate the switching overvoltage in a 500 KV power transmission system under different conditions, such as simultaneous closure and nonsimultaneous closure. It has been shown that when the frequency dependence of network parameters is neglected it gives the same result as that obtained by the Bergeron-Dommel's method, and while such dependence is taken into account the corresponding result agrees with that discussed in the related literatures.

本文基于傅立叶分析,应用快速傅立叶交换法,计算了超高压输电系统的操作过电压. 在计算中,采用了多相π型网络模型来代替实际网络。傅立叶分析使得频率对参数的影响易于计入。采用快速傅立叶交换法可以显著地节省计算时间。 应用以上方法计算了500千伏输电系统在不同条件下,例如同期合闸、非同期合闸下的过电压。当不考虑网络参数随频率变化时,本文采取的方法所得结果与贝杰龙——道米尔法的结果一致;当考虑网络参数随频率变化时,相应结果与有关文献所载的结果一致。

 
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