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截断影响
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  “截断影响”译为未确定词的双语例句
     FINITE LENGTH EFFECT AND KALMAN FILTERING IN THE SPECTRAL ANALY-SIS OF GRAVITY AND MAGNETICS
     重磁异常波谱的截断影响及KALMAN滤波
短句来源
     A METHOD TO REDUCE THE FINITE—LENGTH EFFECT BY KALMAN FILTERING IN SPECTRAL ANALYSIS OF POTENTIAL FIELDS
     一种用Kalman滤波减小位场谱分析截断影响的方法
短句来源
     The precision of traditional modal parameter identification depends on the precision of frequency response function, which has some specific shortcomings including poorer precision caused by window function truncation, the difficulty of calculating the frequency response function, lots of mathematic calculation and the prerequisite of a known exciting function.
     传统频域模态参数识别方法精度都是建立在频响函数的基础上,其识别精度受加窗截断影响有一定的下降,求频响函数比较繁锁,运算量较大,而且还要已知激励函数,具有较大的实用局限性。
短句来源
     The deconvolution by FFT in frequency domain has been introduced in REFERENCE [1] but only the zero-phase wavelet has been dealt with.
     文献[1]介绍了用快速付里叶变换在频率域进行反褶积的方法,但只讨论了零相位子波情况. 本文试图从子波频谱特点着手,对信号截断影响和反褶积不稳定性作一些分析,关于截断效应(或称边界效应、泄漏效应),专著[2]已作理论分析.
短句来源
     the influence of truncatoin of limited survey area and the problems arised due to dividing continuos boundary into discrete boundaries.
     注意水平尺寸因子和有限测区的截断影响以及连续界面分割为离散界面时出现的问题。
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  相似匹配句对
     C.
     C的影响;
短句来源
     The Effect of Modal Truncation on Tire Compliance
     模态截断对轮胎柔度的影响
短句来源
     It is also influenced by its geographic situation.
     地理环境的影响;
短句来源
     Effect of Truncation Parameter on Focal Shift and Focal Switch
     截断参数对焦移量和焦开关的影响
短句来源
     The cutting problem
     截断切割
短句来源
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It is well known that the deconvolution technique has been widely adopted in seismic data-processing. The deconvolution by FFT in frequency domain has been introduced in REFERENCE [1] but only the zero-phase wavelet has been dealt with. Here,the author trys to make an analysis about the truncated effect of the signal and the unstability of deconvolution by the utilization of the spectrum of wavelet.

反褶积技术广泛应用于地震资料的数字处理中.文献[1]介绍了用快速付里叶变换在频率域进行反褶积的方法,但只讨论了零相位子波情况.本文试图从子波频谱特点着手,对信号截断影响和反褶积不稳定性作一些分析,关于截断效应(或称边界效应、泄漏效应),专著[2]已作理论分析.文献[4]、[5]对地震信号道谱分析中平滑窗的应用作了讨论.这里,我们想从理论模型例子来详细说明截断效应的产生并讨论消除它的方法.

In this aticle,applied condition and validity of the matching filter method have been analysed. In discussing the validity of the method, models ot block body and single or double magnetic boundary with different horizontal sizes are formed based on elements of rectangular prizm. The field values of the models have been calculated in frequency domain. The curve of the logrithmic avrage radom spectrum is made to estimite mean depths of the block and boundary by matching filter method. A set of results proved...

In this aticle,applied condition and validity of the matching filter method have been analysed. In discussing the validity of the method, models ot block body and single or double magnetic boundary with different horizontal sizes are formed based on elements of rectangular prizm. The field values of the models have been calculated in frequency domain. The curve of the logrithmic avrage radom spectrum is made to estimite mean depths of the block and boundary by matching filter method. A set of results proved that the estimate depths and the theoretical depths are very defferent. Based to above results, care much be taken to the applied condition of the method, paying attention to the horizontal sizes factor; the influence of truncatoin of limited survey area and the problems arised due to dividing continuos boundary into discrete boundaries.

本文分析了“匹配滤波”方法的应用条件及有效性。为了讨论方法的有效性,以棱柱体模型为基础,组成不同水平尺寸的块体以及磁性单界面和双界面模型,在频率域计算摸型场值,利用模型场的对数平均径向能谱曲线,采用“匹配滤波”方法计算块体顶深及界面平均深度,一系列结果表明,计算值与理论值相差较大。由此得出:在使用该方法时必须注意应用条件;注意水平尺寸因子和有限测区的截断影响以及连续界面分割为离散界面时出现的问题。

When a signal is in minimum phase, its amplitude spectrum and phase spectrum will satisfy Hilbert transform condition. Having known the amplitude spectrum of a non-minimum phase signal, we can conduct Hilbert transform to extract a minimum phase signal of which the amplitude spectrum is identical with that of the non-minimum phase signal. This paper recommends a method for directly converting logarithmic amplitude spectrum into minimum phase spectrum by Hilbert transform in time domain. Parzen's window function...

When a signal is in minimum phase, its amplitude spectrum and phase spectrum will satisfy Hilbert transform condition. Having known the amplitude spectrum of a non-minimum phase signal, we can conduct Hilbert transform to extract a minimum phase signal of which the amplitude spectrum is identical with that of the non-minimum phase signal. This paper recommends a method for directly converting logarithmic amplitude spectrum into minimum phase spectrum by Hilbert transform in time domain. Parzen's window function is used to reduce the truncation effect of Hilbert factor and speed up convergence because parzen window frequency spectrum has neither side lobes nor"missing" problem. This method is characterized by combined operation in frequency domain and time domain. Taking RDS-500 computer as an instance, the combined operation time is half of the time taken when the operation is only conducted in frequency domain. Knacks for making minimum phase spectrum in different cases are illustrated in this paper. The only difference between the amplitude spectrum of seismic record and that of source wavelet is a constant coefficient when the reflection coefficient series is white noise series, In this case, the amplitude spectrum of seismic record can be used as substitute for the amplitude spectrum of source wavelet, then the minimum phase spectrum of source wavelet can be obtained using the method recommended in the paper. A mixed phase signal input also can be transformed into minimum phase signal in this way.

当一个信号为最小相位时,其振幅谱和相位谱符合希尔伯特变换关系。对一个非最小相位信号,在已知它的振幅谱之后,可以通过希尔伯特变换求出一个与之具有相同振幅谱的最小相位信号。本文讨论一种直接将对敷振幅谱在时间域作希尔伯特变换求取最小相位谱的方法。为了减少希尔伯特因子的截断影响和加快收敛,应用帕曾(Parzen)窗函数镶边。因为帕曾时窗函数的频谱没有旁瓣,也不存在泄漏问题。此法的特点是一种既在频率域又在时间域进行混合运算的方法。以RDS-500计算机为例,此法的运算时间要比全部在频率域的运算时间减少一倍。文中列举了几种不同情况下提取最小相位谱的方法。当反射系数序列为白噪序列时,地震记录的振幅谱与震源子波的振幅谱只差一个常数,这时可用地震记录的振幅谱代替震源子波振幅谱,再用文中提出的方法,求出震源子波的最小相位谱。当输入的是一个混合相位信号,也可以采用本文提出的方法转换成最小相位信号。

 
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