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判决阈值
相关语句
  decision threshold
     Analysis of decision threshold for optical correlation receivers in OCDMA system
     光码分多址系统中光学相关接收机判决阈值的分析
短句来源
     The watermark decision threshold is lack of adaptability to the illumination and the print quality. So we propose a method to normalize the watermark decision threshold, which greatly improves the success rate of watermark judgment.
     由于水印判决阈值缺乏对光照、打印质量等全局因素的自适应性,本文提出了水印判决阈值归一化处理的方法,大大提高了水印判决的成功率。
短句来源
     Parametric generalized lambda distribution is utilized to fit the statistical characteristic of detector when only noise exists, which is then used by Neyman-Pearson rule to determine decision threshold at given false alarm probability. Finally, computer simulations achieve detection performance of the obtained frame detector.
     文中用广义Lambda分布描述帧检测器在无信号时的统计特性,并根据Neyman-Pearson准则给出一定虚警概率下的判决阈值,最后通过计算机仿真得到帧检测性能。
短句来源
     The property that the ordered statistics CFAR(OS-CFAR) detector can obtain constant false alarm rate under homogeneous Log-normal distributed clutter background is proved in this paper, when the shape parameter of probability density function is known. Both the detection performance expressions with non-fluctuating target and the ADT (average decision threshold) expressions of the OS-CFAR detector are derived.
     该文证明了在形状参数已知的均匀对数-正态(Log-normal)杂波背景下有序统计恒虚警(OS-CFAR)检测器能保持恒虚警的特性,导出了该背景下OS-CFAR检测器对非起伏目标的检测性能表达式和平均判决阈值(ADT)表达式。
短句来源
  “判决阈值”译为未确定词的双语例句
     In frequency-hopping/time-spreading optical CDMA system, MAI, group velocity mismatch effect and effect of source extinction ratio are analyzed, the schemes of using double optical hard limters and using dispersion shift fiber to enhance system performance.
     在跳频扩时系统中,首先介绍了基于光正交码的跳频扩时系统理论,系统模型,并通过对带来码间干扰的重要因素:多用户干扰,群速度色散和光源消光比进行理论分析和仿真,提出采用双光限幅器来减小多用户干扰,采用色散位移光纤来减小色散和非线性效应,采用随光源消光比变化动态设置解码器判决阈值等方法来减小码间干扰,提高系统性能。
短句来源
     Some modes are tested first, and the neighbor modes of the temp-optimal mode are compared to get the best one. The simulation results show that without considerable performance degradation, the proposed method decreases complexity of the intra-prediction mode decision part in H.264, and saves the computing costs greatly.
     在第三章中我们对已有的帧内预测快速算法进行详细分析,对其中计算复杂度很高的预测模式选择部分进行了深入研究,提出一种基于自适应阈值的快速模式选择算法,该算法可以根据图像复杂度和QP值自适应的调整判决阈值,以确定是否可以将最可能的预测模式作为最终的结果,提前中止预测模式选择过程。
短句来源
     Ln this detector the mean value of the local estimations of CM and CA is taken as the noise power estimationUnder Swerling Ⅱand homogeneous background assumption,the analytic expressions of Pd,Pfa and ADT are derived for the detectorThe results show that the performance of CMCAM-CFAR detector is better than that of OS-CFAR detector in homogeneous background and multi-target situation
     在SwerlingⅡ型目标假设和均匀背景下,推导出了它的检测概率(Pd)、虚警概率(Pfa)和平均判决阈值(ADT)的解析表达式,并与有序统计(OS)恒虚警率(CFAR)检测器进行了比较。 分析结果表明在均匀背景和多目标环境下CMCAM-CFAR检测器的性能均优于OS-CFAR检测器的性能。
短句来源
     Time-frequency moment features based on Wigner-Ville distribution and local time-frequency distribution features based on Margenau-Hill distribution are used as the classification vectors. By comparing these vectors with their suitable thresholds, the classification of different digital modulation types is achieved.
     即以基于Wigner Ville分布(WVD)的一阶时间矩特征和基于Margenau Hill分布(MHD)的局部时频域特征作为分类特征向量,通过特征向量与判决阈值的逐层比较以实现通信信号调制分类。
短句来源
     Based on the joint Gaussian distribution of optical signal log-amplitude sequence,an algorithm for Maximum a posteriori probability(MAP) detection was proposed to mitigate effects of atmospheric scintillation on the performance of the free-space optical communication. And the bit error rate for the proposed algorithm was simulated.
     为了减小大气闪烁对自由空间光通信的通信性能的影响,基于光信号的对数振幅序列服从联合高斯分布特性,提出了一种最大后验概率算法,给出了随时间变化的判决阈值
短句来源
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  相似匹配句对
     The common methods are fixed threshold and dynamic threshold decision.
     常见的有固定阈值判决和动态阈值判决
短句来源
     Analysis of decision threshold for optical correlation receivers in OCDMA system
     光码分多址系统中光学相关接收机判决阈值的分析
短句来源
     Threshold Effect of Stimulated Brilouin Scattering
     受激布里渊散射的阈值效应
短句来源
     Nerve Threshold Value Detector
     神经阈值探测仪
短句来源
     decision-directed algorithm.
     判决反馈的算法。
短句来源
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  decision threshold
The first is that the decision threshold of RAKE is dynamic for different channel environments; the other is that we can improve the traditional TH-PPM modulation, which is, encoding the transmitted data symbol with balance code.
      
As a result, the ROC curve is a plot of all the (False Positive Rate (FPR), True Positive Rate (TPR)) pairs by varying the decision threshold over the whole range of the bootstrap sampling distributions.
      
The reliability and validity of the questionnaire was then estimated and its specificity, sensitivity and optimal decision threshold determined using receiver operating characteristic (ROC) curve analyses.
      
At the optimum decision threshold the computer analysis resulted in a sensitivity for CAD of 88% and a specificity of 95%.
      
A decision threshold for a sensitivity of 80% for osteoporotic fractures resulted in a specificity value of only 37% for SOSp, between 53 to 65% for calcaneus US measurements and 45 to 56% for BMD.
      
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Theoritically, the resolution is limitless for adapting the classifying equation in the statistic pattern recognition. For those unknown spectra,they are not concerned in the training process. Especially, for the background and system clutter or noise, because of their random characteristic, there are very large probability to meet the pollution cloud's decision equation, so as to cause some entire random false alarm. According to the spectra analysis, a decision algorithm is proposed in this paper.The decision...

Theoritically, the resolution is limitless for adapting the classifying equation in the statistic pattern recognition. For those unknown spectra,they are not concerned in the training process. Especially, for the background and system clutter or noise, because of their random characteristic, there are very large probability to meet the pollution cloud's decision equation, so as to cause some entire random false alarm. According to the spectra analysis, a decision algorithm is proposed in this paper.The decision threshold is obtained from the dynamic training. Then, the false alarm problem is solved.This technique provides a successful discrimination for the interested pollution cloud with negligible false alarm rate in the passive IR remote sensing.

污染云团光谱自动鉴别报警中的虚警是十分重要而必需研究解决的问题。理论上,满足分类方程的解是无限的。对未参与训练的干扰谱,特别是背景与系统噪声,由于其波形的随机性,有很大的概率满足污染云团光谱的判决条件,从而造成完全随机的虚警。根据对光谱频谱的分析,本文提出了一种判决算法。经系统动态训练选择出判决阈值,解决了虚警问题,从而在外场鉴别试验中获得圆满成功。

In this paper, on the basis of comparison of speaker verification and speaker identification, a novel speaker verification method is proposed. Compared to the conventional method, the speakerindependent speaker model is established to represent the universal feature of speech, and is used during the verification phase so that the decision threshold is adapted to different input speech and decided during verification phase. The difficulties of setting the decision threshold for the conventional method are alleviated...

In this paper, on the basis of comparison of speaker verification and speaker identification, a novel speaker verification method is proposed. Compared to the conventional method, the speakerindependent speaker model is established to represent the universal feature of speech, and is used during the verification phase so that the decision threshold is adapted to different input speech and decided during verification phase. The difficulties of setting the decision threshold for the conventional method are alleviated by using the proposed method. Experiments show that this novel method can significantly decrease the false acceptance rate and the false rejection rate of a speaker verification system, providing a promising way for realizing practical speaker verification systems.

文章在对说话人确认和说话人辨认进行比较研究的基础上,提出一种新的说话人确认方法.同传统方法相比,该方法通过建立非特定说话人模型综合多个说话人的语音特性,使其能够对于不同的待确认语音给出不同的判决阈值,从而解决了说话人确认在判决阈值设置上存在的困难.实验结果表明,该方法能够显著降低说话人确认系统的错误接受率和错误拒绝率,为说话人确认应用于保密性要求较高的环境提供了一条有效的途径.

This paper purposes a theoretical analysis of the BER performance of burst mode receiver. Considering two inherent factors, decay time constant and noise characteristic of the adaptive decision threshold, a comprehensive model to analyse the performance of burst mode receiver is proposed. The theoretical model explains the burst mode receiver's sensitivity penalty and agrees with the experiment result. The power penalty is about 2.3?dB at a BER of 10 -9 compared with convention receiver in the...

This paper purposes a theoretical analysis of the BER performance of burst mode receiver. Considering two inherent factors, decay time constant and noise characteristic of the adaptive decision threshold, a comprehensive model to analyse the performance of burst mode receiver is proposed. The theoretical model explains the burst mode receiver's sensitivity penalty and agrees with the experiment result. The power penalty is about 2.3?dB at a BER of 10 -9 compared with convention receiver in the condition of continue mode when n =23, K f=0.05, K r=10 . Even if the K f=0, because of the noise of decision threshold, there is a BER penalty when work in the burst mode.

在考虑判决阈值的衰落时间和噪声特性对光接收机性能的影响后 ,提出了一种分析突发模式光接收机误码性能的综合模型 ,并分析了与传统的交流耦合光接收机相比较时 ,突发模式光接收机的灵敏度损失 .

 
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