共查询到18条相似文献,搜索用时 125 毫秒
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锁相环的VHDL-AMS建模与仿真分析 总被引:2,自引:2,他引:0
介绍具有混合信号系统描述能力的硬件描述语言VHDL-AMS的新特性。通过对锁相环路进行数学分析,建立锁相环的VHDL-AMS模型,并进行仿真分析。从文中可以看出,应用VHDL-AMS.使得锁相环的仿真设计更加简捷有效。 相似文献
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图像是人类获取信息,传递信息的重要媒介,在人类生活中有着广泛的应用,并且成为一种科学研究和社会生产的重要工具。鉴于偏微分方程能够在很好地去除图像噪声的同时又可以较好地保持图像的边缘和细节信息,它被广泛应用于图像分割、图像复原、图像重建、边缘检测等各种领域。尤其是Perona and Malik提出的各项异性扩散方程,在实际应用中取得良好的效果。但PM模型的平滑效果比较差,容易出现块效应,即处理后的图像形成多个内部灰度相同的块状区域或阶梯状区域。因此基于PM模型的改进方法被相继提出,其中对扩散系数的改进尤为重要,本文在前人研究的基础上提出了一种新的改进方法。该方法在加入方差的同时,引入边缘停止函数,实验证明,改进的算法可以在降噪的同时很好地保护图像的边缘信息,并且有效地避免了块效应。 相似文献
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本文提出了一类用于求解偏微分方程的分布参数神经网络,并且在连续时空上研究了它的动态特性。最后还给出了两个模拟试验,用于检验这类网络的有效性。 相似文献
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一种基于偏微分方程的PCB图像增强方法 总被引:1,自引:0,他引:1
针对传统的图像增强方法对印刷电路板(PCB)图像进行预处理时难以一步实现去噪和增强对比度的问题,提出了一种基于偏微分方程的图像增强方法,并给出了具体实现过程。该方法采用基于TV模型的降噪与直方图均衡化相结合来实现,在增强对比度的同时保留有效边缘。仿真实验表明了该算法优于传统的先增强、后去噪和先去噪、后增强的方法。 相似文献
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一种偏微分方程图像平滑方法 总被引:1,自引:0,他引:1
在各向异性扩散图像平滑的过程中,保持图像平滑性及保留图像特征都很重要。本文将复域内的扩散过程 与实数域内的扩散过程结合起来,使扩散过程具有更好的平滑效果,并能更好保持图像边缘,用实验证明该方法的有效性。 相似文献
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One of the most challenging tasks while designing an automotive electronic device is to take into account its whole electro-mechanic
environment, so that time expensive failure tests can be reduced. We show a case study, developed in collaboration with an
industrial partner, in which an automotive compact disk (CD) player is modelled. Using VHDL-AMS, not only its whole mixed-signal
electro-mechanic structure, but the car one, the road profile and the audio input have been described as well. A set of fault
analyses have been performed, too, using the developed model. Results demonstrate the feasibility of the methodology both
as a substitute of traditional fault analyses, and as a method to inspect the failure causes. Besides, this approach allows
to highlight, during the design phase, the key points to optimize the target device, taking into account its real application
environment. As an example, our system is able to reliably predict reading errors due to road profile variations.
相似文献
Massimo Ruo RochEmail: |
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VHDL—AMS在控制系统分析与设计中的应用 总被引:1,自引:1,他引:0
硬件描述语言VHDL在现代电子系统设计中应用广泛,但VHDL只能用于设计数字系统。具有混合信号系统描述能力的硬件描述语言VHDL-AMS是目前电子设计技术的新发展,能实现数字系统和模拟系统设计方法的统一,目前仍处于研究阶段。介绍VHDL-AMS的新特性,通过对PID控制原理进行数学分析,建立PID控制器的VHDL-AMS模型,并进行仿真分析。可以看出,应用VHDL-AMS使得控制系统的建模和仿真分析更加简捷有效,因此具有良好的应用前景。 相似文献
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Sun Lijuan 《中国邮电高校学报(英文版)》1997,(1)
TheApplicationofCelularNeuralNetworksforSolvingPartialDiferentialEquationsSunLijuan(DepartmentofComputerEngineering,NanjingUn... 相似文献
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Mohammadehsan Hajiramezanali Seyyed Hamed Fouladi James A. Ritcey Hamidreza Amindavar 《ETRI Journal》2013,35(5):849-858
In this paper, we propose a new adaptive single model to track a maneuvering target with abrupt accelerations. We utilize the stochastic differential equation to model acceleration of a maneuvering target with stochastic volatility (SV). We assume the generalized autoregressive conditional heteroscedasticity (GARCH) process as the model for the tracking procedure of the SV. In the proposed scheme, to track a high maneuvering target, we modify the Kalman filtering by introducing a new GARCH model for estimating SV. The proposed tracking algorithm operates in both the non‐maneuvering and maneuvering modes, and, unlike the traditional decision‐based model, the maneuver detection procedure is eliminated. Furthermore, we stress that the improved performance using the GARCH acceleration model is due to properties inherent in GARCH modeling itself that comply with maneuvering target trajectory. Moreover, the computational complexity of this model is more efficient than that of traditional methods. Finally, the effectiveness and capabilities of our proposed strategy are demonstrated and validated through Monte Carlo simulation studies. 相似文献
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Fault Modeling and Simulation Using VHDL-AMS 总被引:1,自引:0,他引:1
A. J. Perkins M. Zwolinski C. D. Chalk B. R. Wilkins 《Analog Integrated Circuits and Signal Processing》1998,16(2):141-155
Fault simulation is an accepted part of the test generation procedure for digital circuits. With complex analog and mixed-signal integrated circuits, such techniques must now be extended. Analog simulation is slow and fault simulation can be prohibitively expensive because of the large number of potential faults. We describe how the number of faults to be simulated in an analog circuit can be reduced by fault collapsing, and how the simulation time can be reduced by behavioral modeling of fault-free and faulty circuit blocks. These behavioral models can be implemented in SPICE or in VHDL-AMS and we discuss the merits of each approach. VHDL-AMS does potentially offer advantages in tackling this problem, but there are a number of computational difficulties to be overcome. 相似文献
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