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通道噪声
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  channel noise
     According to this draw a conclusion to control the HFC two-way network upstream channel noise,firstly it is to establish standards of construction technique and upstream channel testing,then build up the network operating and monitoring system,blocking noise source through high-pass filter.
     控制HFC双向网络上行通道噪声的方法,首先是要建立施工工艺及上行通道测试标准,其次要建立网络运行监控体系,通过高通滤波器阻断噪声源。
短句来源
     One of main tasks in robust telephone speech recognition is to overcome channel noise. In this paper,the two level CMS is adopted for channel compensation of telephone speech recognition. It is shown from the experiment that the performance of two level CMS is better than that of CMS.
     顽健的电话语音识别的主要任务之一是克服通道噪声的影响.将二阶CMS方法应用到电话语音识别的通道补偿中,实验表明该方法的性能优于通常的CMS方法.
短句来源
     The analysis result indicates that employ of TTA can extend the coverage, decrease RF channel noise factor, and reduce the cost of network construction.
     分析结果表明,塔顶放大器可扩大系统覆盖范围,减少射频通道噪声系数,降低组网成本。
短句来源
  “通道噪声”译为未确定词的双语例句
     The Analysis of Noise Source of Upstream Channel in Broadband HFC Network
     宽带HFC网络回传通道噪声源的分析
短句来源
     Analysis on Noise of HFC Two-way Network Upstream Channel
     HFC双向网络上行通道噪声分析
短句来源
     The Noise and Interference of Upstream Channel in Two-way HFC Networks
     双向HFC网络上行通道噪声与干扰问题
短句来源
     It is the theoretical basis on designing the restraining method of noise.
     并提出记录通道噪声的物理模型,为设计噪声的抑制方法奠定理论基础。
短句来源
     Design and Study on the Noise Model of Recoding Channel in Volume Holographic Storage
     体全息存储记录通道噪声模型的研究与设计
短句来源
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  相似匹配句对
     Single-Channel White Noise Estimators
     单通道噪声估值器
短句来源
     Research of Noise Performance of Pre - amplifiers
     信号放大通道噪声特性的研究
短句来源
     nformation passage
     信息通道
短句来源
     Information passage
     信息通道
短句来源
     and noise group (N. G.)
     和噪声组(N.G.)
短句来源
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  channel noise
It is shown by simulations that the weight values of the new scheme converge to the optimal values closely for non-minimum phase channels as well minimum phase channels, if the channel noise is small enough.
      
The expressions for the probability of error are presented when the channel noise is additive Gaussian noise and each branch is M-ary orthogonal signaling modulation.
      
Header error control schemes for coping with upstream channel noise in the HFC network
      
However VLC methods are very sensitive to channel noise.
      
This paper deals with method of normalization of solution of information recovery from chaotic carrier distorted by channel noise task.
      
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Improving the dynamic range of front-end HF channel in SW communi-cation receiver is studied in this paper with aid of Volterra functional series. First, a functional model and a Volterra model of front-end HF channel are founded. Target optimum distribution of front-end HF channel is investigated with a 3rd intermodulation of intersecting point dynamic range as an object function. Then an universal program (NDAP) analysing nonlinear distortion in amplifier by means of Volterra functional series is compiled...

Improving the dynamic range of front-end HF channel in SW communi-cation receiver is studied in this paper with aid of Volterra functional series. First, a functional model and a Volterra model of front-end HF channel are founded. Target optimum distribution of front-end HF channel is investigated with a 3rd intermodulation of intersecting point dynamic range as an object function. Then an universal program (NDAP) analysing nonlinear distortion in amplifier by means of Volterra functional series is compiled on the foundation of the nonlinear transistor model. A double-transistor-parallel amplifier with dynamic range is developed. The phase modulation effect of RF signal on LO signal in a mixer is briefly discussed, and methods of improving the linearity in the mixer are introduced. A FET passive high-level double-balanced mixer of high linearity is also made. Finally, A front-end HF channel with high dynamic range is realized with an intersecting point dynamic range of 97.9 dB by using the 3rd intermo-dulation and the noise is suppressed to 5,8 dB or less.

本文应用Volterra泛函级数理论,研究扩大短波通信接收机前端高频通道的动态范围。首先建立了前端高频通道的功能模型和Volterra模型,采用三阶互调截点动态范围指标为目标函数,对前端高频通道指标的优化分配问题进行了研究。在建立晶体管非线性模型的基础上,编制了用Volterra泛函级数法分析放大器非线性失真的通用程序NDAP,并研制了大动态范围的双管并联放大器,进而简述了混频器中信号对本振的相位调制效应,提出了改善混频器线性的方法。研制了高线性的场效应管无源高电平双平衡混频器,最后实现了大动态范围的前端高频通道,通道的噪声系数小于等于5.8dB,三阶互调截点动态范围达到97.9dB。

This paper describes a practical technique and method, and its related theoretical problems for receiver calibration of millimeter-wave radiome- ter (of null-balancing Dicke and antenna-channel noise injection type), without commercial noise standards available. An expression is presented, which can be used to calculate the effective output noise temperature of the combination of calibration source and feeding line as temperature dist- ribution of the latter is nonuniform, and its result is discussed. The eff-...

This paper describes a practical technique and method, and its related theoretical problems for receiver calibration of millimeter-wave radiome- ter (of null-balancing Dicke and antenna-channel noise injection type), without commercial noise standards available. An expression is presented, which can be used to calculate the effective output noise temperature of the combination of calibration source and feeding line as temperature dist- ribution of the latter is nonuniform, and its result is discussed. The eff- ects due to the change of reference temperature with operation enviroment are treated too, and a correct formula is given, which is used to estimate measurement values of the antenna radiometric temperature under this con- dition. Although effects of impedance mismatches are not discussed, the calibration curves T_A~X and T_N~Y given in the paper have taken into con- sideration the correction of the effects. The presented basic calibration method and the derived conclusions from the treatments apply to the case of impedance mismatches.

本文研究在无商用噪声标准情况下,毫米波辐射计(零平衡Dicke式天线通道噪声注入型)接收机定标的实用技术、方法及有关理论问题。导出了校准源的馈线温度非均匀分布时,校准源-馈线组合的有效输出噪声温度的计算公式,并对其结果进行了讨论。对参考温度因环境而变化所造成的影响也进行了讨论,并给出此种情况下天线温度测量值的正确推算式。阻抗失配的影响虽未讨论,但所给T_A~X和T_N~Y定标曲线已对此影响进行了修正;所提供的基本校准方法及讨论所得结论都适用于限抗失配情形。

We attempted to understand the effect of noise on stereopsis in different spatial channels. Seven random noise images with noise level from 5% to 35% in every 5% interval were designed. These noise images and random-dot stereogram were filtered digitally by Butterworth filter and Gabor function filter with Centre frequency and band width as Wilson's four spatial frequency channels. Filtered stereograms added to the different noise images were examined under a stereoscope to see if any depth could be perceived.We...

We attempted to understand the effect of noise on stereopsis in different spatial channels. Seven random noise images with noise level from 5% to 35% in every 5% interval were designed. These noise images and random-dot stereogram were filtered digitally by Butterworth filter and Gabor function filter with Centre frequency and band width as Wilson's four spatial frequency channels. Filtered stereograms added to the different noise images were examined under a stereoscope to see if any depth could be perceived.We get the results as follows.1. Stereoscopic noise tolerance in high frequency channel is greater than that in low frequency channel.2. Slereoscopic noise tolerance of unfiltered stereograms is the greatest, that of stereogram filtered by Gabor function filter is greater than that of stereogram filtered by Butterworth filter.3. When noise exceeds 15%, low frequency noise restrains the match between low frequency stereograms, so does high frequency noise to the match between low frequency stereograms or high frequency stereograms. However, low frequency noise has no effect on match between high frequency stereograms.4. The maximum noise tolerance of unfiltered stereogram and all stereograms of spatial frequency channels do not exceed 25%.

本工作希望了解噪声在各空间频率通道中对体视的影响.产生从5%至35%每隔5%的七个等级的随机点噪声图象,参照Wilson四通道模型的频率分别用两种不同滤波器对随机点立体图对(RDS)及噪声图象进行滤波,然后在各通道图对中加入不同通道噪声进行匹配观察.得到:1.高频通道的体视抗干扰能力高于低频通道.2.Gabor函数滤波后图对的体视抗干扰能力高于Butterworth滤波器滤波后的,但均低于未滤波的.3.当噪声大于15%时,低频噪声对低频图对及高频噪声对高、低频图对的体视匹配有抑制作用,而低频噪声对高频图对则影响很小.4.未滤波及各通道图对的最大噪声容限均不超过25%.

 
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