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signal to noise ratio
相关语句
  信噪比
     According to the order mentioned above, the signal to noise ratio were 1.68±0.21;
     按上述顺序,肺实质的信噪比为1.68±0.21;
短句来源
     , Ni? and Co? complexes at about -0.44, -0.60, -0.76, -1 07 and -1.24 V, respectively, and when the signal to noise ratio equals to 3, the detection limits are 1.0× 10 -8 , 2.3×10 -8 , 1.3×10 -8 , 2.9×10 -10 and 3.6×10 -11 mol/L, respectively.
     信噪比为 3时 ,检出限分别为 1.0× 10 - 8、2 .3×10 - 8、1.3× 10 - 8、2 .9× 10 - 1 0 和 3 .6× 10 - 1 1 mol/L。
短句来源
     The signal to noise ratio obtained was 22 dB at the bandwidth of 50 kHz.
     信噪比在50千赫带宽时约为22dB。
短句来源
     Simulation indicates signal to noise ratio(SNR) is improved from 7.2 dB to 31.5 dB with spectral subtraction method when there are 1 024 data samples.
     仿真表明,在数据点数为1 024个时,使用谱减去噪使信噪比由7.2dB提高到31.5dB.
短句来源
     Experiment result indicates that the segment signal to noise ratio (at 4-8kbps) of ADP-CELP coder is 2dB higher than that of CELP coder.
     实验结果表明,在4.8kbps处,ADP-CELP编码器比CELP编码器的分段信噪比高大约2dB.
短句来源
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  信号噪声比
     Achievement of a signal to noise ratio adequate for precise registration is accomplished using digital signal enhancement techniques.
     用数字信号增强技术可以得到足以精确定位的信号噪声比
短句来源
     2.Gd-DPTA could enhance signal to noise ratio of IPL in rabbit, improved it's conspicuity.
     2,Gd一D仰A增强可提高兔肝炎性假瘤与正常组织的信号噪声比,提高病灶的显现性。
短句来源
     The simulation results show that the signal to noise ratio appear to be the primarily consideration of the limit coding width.
     仿真计算表明 ,信号噪声比是决定极限编码宽度的主要因素。
短句来源
     The problem of the improvement of signal to noise ratio in the method of sampling display is analysed on a more general basis.
     本文在比前人的分析更为普遍的基础上研究了取样显示过程中信号噪声比的提高问题。
短句来源
     The signal to noise ratio is improved,so thar the equipment can detect the fluorescene signals with a low power He-Ne laser as exciting light source.
     信号噪声比的改善使得这种装置可以使用小功率氦氖激光作为激发光条件下探测荧光信号。
短句来源
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  “signal to noise ratio”译为未确定词的双语例句
     The limit of detection was 0. 2 μmol/L ( signal to noise ratio≥3) and the limit of quantification was 1.0μmol/L (RSD =4. 88% ,n =3).
     检测限为0.2μmol/L(S/N≥3),定量限为1.0μmol/L(RSD=4.81%,n=3)。
短句来源
     Experimental results show that the proposed algorithm outperforms AT-3DSPIHT (asymmetric transform 3D set partitioning in hierarchical trees) and 3DSPECK by 0.4 dB and 1.4dB on the average PSNR (peak signal to noise ratio) respectively. Compared with popular zerotree approaches, AT-3DSPECK is faster in coding speed.
     实验测试表明:AT-3DSPECK算法的平均PSNR(peak signal to noise ratio)分别比AT-3DSPIHT(asymmetric transform 3D set partitioning in hierarchical trees)和3DSPECK算法高0.4dB和1.4dB.此外,AT-3DSPECK还具有比零树算法更快的编码速度.
短句来源
     The detection limits (signal to noise ratio of 2) are 0. 26 μg/ml for neodymium and 0. 50 fig/ml for erbium,respectively.
     它们的检出限(S/N=2)是0.26μgNd/ml和0.50μgEr/ml。
短句来源
     These optical fibre voltage and electric field sonsors are demonstrated at an operation frequency voltage of 60~6000V and electric field in- tensity of 50~5000V/cm,its non-linear error is less than 1 percent and signal to noise ratio is as high as 1000.
     在工频电压60~6000V和工频电场强度50~5000V/cm 条件下验证了这种光纤电压电场传感器, 其非线性误差小于1%,信噪比达1000。
短句来源
     Methods: Seventy two SD rats, 4 rats a group at random, underwent MR enhancement with 0, 2, 5, 8, 10, 12, 15, 20, 30, 40, 50, 60, 70, 80, 100, 140, 210, 280 μmol/kg SPIO respectively after plane examination. The signal to noise ratio of liver was measured and a curve of dosage gradient liver signal intensity was made.
     方法 :72只正常 SD大鼠随机分成 18个样本组 ,每组 4只。 平扫后分别以 0、2、5、8、10、12、15、2 0、30、40、5 0、6 0、70、80、10 0、140、2 10、2 80μm ol/kg SPIO剂量行增强扫描 ,作剂量梯度 -肝脏信号曲线。
短句来源
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  signal to noise ratio
An increase in the constant component, determining a static asymmetry of the potential, leads to a decrease in the signal to noise ratio as compared to the symmetric case.
      
The influence of the width of the main spectral line of the chaotic drive signal on the signal to noise ratio at the response system's output has been studied.
      
Then the relation between bandwidth efficiency and signal to noise ratio is discussed.
      
Theory and experiment demonstrate that the secure communication by small time continuous feedback method does not require the system to be divided into subsystems, and has no limitation of signal to noise ratio.
      
the same convergence factorc can be used within a fairly wide range of signal to noise ratio (SNR) of input signal.
      
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Small quantities (0.1, 0.5 and 1.0 weight percent) of rare earth oxides (La2O3, CeO2, Sm2O3, Gd2O3) and Y2O3 were added to a square-loop Mg-Mn ferrite which contained some ZnO and CuO. The effect of these additions on the static hysteresis loop and the signal to noise ratio was investigated. The samples were prepared by the usual oxide method, sintered 2 hours in air at 1300℃ and quenched from l050℃ or 950℃. Preli-

本文报导了少量稀土元素氧化物(La_2O_3,CeO_2,Sm_2O_3,Gd_2O_3和Y_2O_3)对于一种含ZnO和CuO的Mg-Mn矩磁铁氧体磁心性能的影响,简要地叙述了样品的制备过程。测量了磁心的静态磁滞迴线,饱和磁化强度,居里点和讯号杂音比。实验结果表明:加La_2O_3或Gd_2O_3可以增加矩形比和B-Hm/2/B_m和讯号杂音比,并使后者的分布往高比值移动,但加CeO_2,Sm_2O_3或Y_2O_3却没有使这些性能改善,甚至有所降低。文中举例说明了磁心尺寸对于矩形比、淬火温度和稀土元素氧化物的含量对于讯号杂音比的影响。最后指出:这种方法可能提供一种改善磁心某些性能而不显著改变其居里点的途径。

The output signal-to-noise ratio (snr) of correlation detectors is analized.A correla-tion detector is a divice, which consists of two input filters, one output filter and one multiplier, and has two input pairs of terminals and one output pair of terminals.Unlike that described in papers[1][[2][[3] and[3], effects of input filters are consid ered in this paper. The formulation concerning the relation between the input snr and the output snr are derived, and special working conditions of correlation...

The output signal-to-noise ratio (snr) of correlation detectors is analized.A correla-tion detector is a divice, which consists of two input filters, one output filter and one multiplier, and has two input pairs of terminals and one output pair of terminals.Unlike that described in papers[1][[2][[3] and[3], effects of input filters are consid ered in this paper. The formulation concerning the relation between the input snr and the output snr are derived, and special working conditions of correlation detectors are discussed.The conclusion is us follows: For small snr, the output snr is proportional to the products of two input snr; if the input snr of one channel is much lorger than the other and than 1, the output snr will be proportional to the smaller input snr; for all conditions (either strong signal, or weak signal) . the output snr of correlation detectors is comparable to the squar law detector's.

本文分析讨论相关检波器的输出信号杂音比,所谓相关检波器是这样一种装置,它包含两个输入和一个输出并由两个输入滤波器、一个输出滤波器和一个乘积器组成。和以前有过的讨论不同,文中考虑到了输入及输出滤波器的影响,导出了输入及输出信号杂音比关系的公式,讨论了相关检波器的几种特殊工作形式。结果指出,在小输入信号杂音比情况下,输出信号杂音比和两路输入信号杂音比的乘积成正比;在一路输入为大信号(相对于杂音)的情况下,输出信号杂音比和另一路输入信号杂音比成正比;无论在大信号或小信号输入情况下,相关检波器的输出信号杂音比与同样情况下平方检波器的输出信号杂音比是同量级的。

Where difficulty has been encountered in obtaining good reflections, it has become almost a general practice to use a group of seismometers insteads of a single seismometer in a channel. One of the primary advantages in such a method is to increase the ratio of useful to extraneous energy recorded in seismogram. If the seismometers are too near to each other, benefit is seldom obtained, because all seismometers in a channel might be considered to be placed at a single point and multiple detection is only a method...

Where difficulty has been encountered in obtaining good reflections, it has become almost a general practice to use a group of seismometers insteads of a single seismometer in a channel. One of the primary advantages in such a method is to increase the ratio of useful to extraneous energy recorded in seismogram. If the seismometers are too near to each other, benefit is seldom obtained, because all seismometers in a channel might be considered to be placed at a single point and multiple detection is only a method of increasing the amplitude both of useful and of extraneous energy. As the separation of seismometers becomes large enough, microseism can be assumed as a random noise, the signal to noise ratio will be increased n~(1/2) times by using multiple detection, when the effective waves strike the seismometers fairly well in phase. But where reflected waves from strong dipping or shallow beds are involved, the discriminatory powers of seismometers might defeat its purpose unless the seismometers in each group are closely spaced. Assuming microseisms to be plane waves traveling to the earth surface from random directions, the problem of how far the detection can be improved when the seismometers in a single group are closely spaced is studied in detail. It is shown that the relative amplitude of microseisms in the records depends statistically not only on the numeber of seismometers in a single group, but also on distances between them, the microseismic frequency spectra and the elastic velocity in the medium. The result obtained in this paper can be used as a guide for choosing multiple seismometer confiquration in seismic field operation.

地震勘探組合法中,采用很小的組內检波器間距离吋,組合法仅只起提高接收仪器灵敏度的作用;检波器間距較大情况下,微震干扰可以看作相互独立的随机干扰来研究;但在間距不太大但也不能认为等于零时,組合方法的效果却是个尚待討論的問題。本文假定微震是由传播方向随机改变的平面波形成的,用概率論方法討論了組合地震法对徽震干扰的压制效果。

 
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