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2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353)最新文献

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Software radio based re-configurable correlator/FIR filter for CDMA/TDMA receiver 基于软件无线电的可重构相关器/FIR滤波器用于CDMA/TDMA接收机
Fu-Yen Kuo, Chung-Wei Ku
In this paper, a re-configurable architecture for both chip-rate de-spreading and FIR filtering is proposed. The proposed architecture can be configured as a chip matched filter, multi-code RAKE receiver, or an FIR filter. Since these modules are essential for CDMA/TDMA systems, we believe the proposed architecture is quite useful for CDMA/TDMA dual-mode receiver design.
本文提出了一种芯片速率解扩和FIR滤波的可重构结构。所提出的架构可以配置为芯片匹配滤波器、多码RAKE接收器或FIR滤波器。由于这些模块对于CDMA/TDMA系统是必不可少的,我们相信所提出的架构对于CDMA/TDMA双模接收器设计非常有用。
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引用次数: 6
Haar filtering with pyramidal resistive networks 金字塔型电阻网络的哈尔滤波
R. Matei
Resistive networks have attracted the interest of researchers for their potential applications especially in parallel signal processing. At present they are essential components in analog VLSI circuit implementation of many image processing systems. Resistive grids, as well as their dynamic and more complex counterpart-the cellular neural networks-can perform various spatial filtering operations. One of the most important applications of the resistive grid is the silicon retina, proposed by Mahowald and Mead [1989], whose structure has a well-established neurobiological basis. The data to be processed (an image in the 2-D case) is sampled by a rectangular grid, so that each node of the network is associated with a pixel in the image that is to be filtered. In this paper we propose a different structure for a resistive network with a pyramidal topology which may prove to find some useful applications in parallel signal processing. We will show that the proposed network performs a nonlinear spatial filtering of the input 1D image, implementing in fact a Haar filter.
电阻网络以其潜在的应用前景,特别是在并行信号处理方面的应用,引起了研究人员的兴趣。目前,它们是许多图像处理系统的模拟VLSI电路实现中必不可少的元件。电阻网格,以及它们的动态和更复杂的对应物——细胞神经网络——可以执行各种空间滤波操作。电阻网格最重要的应用之一是由Mahowald和Mead[1989]提出的硅视网膜,其结构具有完善的神经生物学基础。要处理的数据(二维情况下的图像)由矩形网格采样,这样网络的每个节点都与要过滤的图像中的一个像素相关联。在本文中,我们提出了一种具有金字塔拓扑的电阻网络的不同结构,这可能会在并行信号处理中找到一些有用的应用。我们将展示所提出的网络执行输入一维图像的非线性空间滤波,实际上实现了哈尔滤波器。
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引用次数: 0
Cross coupled transconductance cell with improved linearity range 提高线性范围的交叉耦合跨导电池
B. Maundy, I. Finvers, P. B. Aronhime
A novel variation of the cross-coupled operational transconductance cell is presented in this paper. The conventional cross-coupled cell has a differential input linearity range that is dependent on the control voltage. The proposed design removes that restriction while allowing the same tunability using the control voltage. Its input may also be single or fully differential unlike the conventional cross-coupled cell, which requires a fully differential input. Results were confirmed using HSPICE simulations.
本文提出了一种新型的交叉耦合工作跨导电池。传统的交叉耦合电池具有依赖于控制电压的差分输入线性范围。提出的设计消除了这一限制,同时允许使用控制电压具有相同的可调性。它的输入也可以是单或全差分,不像传统的交叉耦合电池,它需要一个全差分输入。结果通过HSPICE模拟得到证实。
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引用次数: 6
Design of networked visual monitoring systems 网络化视觉监控系统的设计
Chin-Hwa Kuo, Tay-Shen Wang
Reports on the design and implementation of a networked visual monitoring system for surveillance. Instead of the usual periodic monitoring, the system has an auto-tracking feature which captures the important characteristics of intruders. We integrate two schemes, namely, image segmentation and histogram comparison, to accomplish the auto-tracking feature. The developed tracking scheme is able to segment and track moving objects from the background in real time. The tracked object information is used to guide the motion of the tracking camera to track the intruders and then to take a series of photographs. In multiple object tracking, we have developed a multiple objects tracking scheme, based on object color histogram comparison, to overcome object occlusion and disocclusion issues. To achieve efficient transmission and storage, the captured video is compressed in H.263 format. Query based on time as well as events are provided. Users can access the system from web browsers to view the monitoring site or manipulate the tracking camera on the Internet. These features are of importance and value to surveillance.
报告了一种用于监控的网络化视觉监控系统的设计与实现。该系统具有自动跟踪功能,可以捕获入侵者的重要特征,而不是通常的周期性监控。我们结合图像分割和直方图比较两种方案来实现自动跟踪功能。所开发的跟踪方案能够实时地从背景中分割和跟踪运动物体。跟踪目标信息用于引导跟踪摄像机的运动,跟踪入侵者并拍摄一系列照片。在多目标跟踪中,我们开发了一种基于目标颜色直方图比较的多目标跟踪方案,以克服目标遮挡和解除遮挡问题。为了实现高效的传输和存储,采集的视频被压缩成H.263格式。提供基于时间和事件的查询。用户可以通过网络浏览器访问该系统,查看监控站点或在互联网上操作跟踪摄像头。这些特点对监控具有重要的意义和价值。
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引用次数: 5
On complexity of bifurcations for some classes of systems with simple dynamics 一类简单动力学系统的分岔复杂性
M. Shashkov
A class of codimension two dynamical systems with very simple dynamics is considered. In spite of simplicity of the dynamical behavior, the structure of the bifurcation set is rather complicated. It is shown that there is no versal two-parameter family of dynamical systems which could describe completely the structure of the bifurcational set.
考虑了一类具有非常简单动力学的协维二动力系统。尽管分岔集的动力学行为很简单,但其结构却相当复杂。结果表明,不存在能够完全描述分岔集结构的通用双参数族。
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引用次数: 0
A digitally controlled low-power clock multiplier for globally asynchronous locally synchronous designs 一种用于全局异步局部同步设计的数字控制低功耗时钟乘法器
T. Olsson, P. Nilsson, T. Meincke, A. Hemami, M. Torkelson
Partitioning large high-speed globally synchronous ASICs into locally clocked blocks reduces clock skew problems and if handled correctly it also reduces the power consumption. However, to achieve these positive effects, the blocks need on-chip clock generators having properties such as small area and low power consumption. Therefore, a low power, high frequency, small area digitally controlled on-chip clock generator is designed and fabricated using a 0.35 /spl mu/m process. The clock generator delivers up to 1.15 GHz at 3.3 V supply voltage. At 1 V supply voltage, it delivers up to 92 MHz while consuming 0.16 mW.
将大型高速全局同步asic划分为本地时钟块可以减少时钟倾斜问题,如果处理得当,还可以降低功耗。然而,为了实现这些积极的效果,这些块需要具有小面积和低功耗等特性的片上时钟发生器。因此,采用0.35 /spl mu/m工艺,设计并制作了一种低功耗、高频率、小面积的数控片上时钟发生器。时钟发生器在3.3 V电源电压下提供高达1.15 GHz的频率。在1 V电源电压下,它提供高达92 MHz的电压,同时消耗0.16 mW。
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引用次数: 28
An algorithm for the design of multiplierless approximately linear-phase lattice-wave digital filters 无乘法器近似线性相位格波数字滤波器的设计算法
J. Yli-Kaakinen, T. Saramäki
This paper describes an efficient algorithm for the design of multiplierless approximately linear-phase lattice wave digital (LWD) filters (parallel connection of two all-pass filters). The coefficient optimization is performed in two basic steps. First, a nonlinear optimization algorithm is used for determining a parameter space of the finite-precision coefficients including the feasible space where the filter meets the given amplitude and phase specifications. The second step involves finding the filter parameters in this space such that the resulting filter meets the given criteria with the simplest coefficient representation forms. The proposed algorithm guarantees that the optimum multiplierless finite-wordlength solution can be found. This is illustrated by means of an example.
本文介绍了一种设计无乘法器近似线性相位点阵波数字滤波器(两个全通滤波器并联)的有效算法。系数优化分为两个基本步骤。首先,采用非线性优化算法确定有限精度系数的参数空间,包括滤波器满足给定振幅和相位规范的可行空间;第二步涉及在该空间中查找过滤器参数,使结果过滤器符合给定的标准,并使用最简单的系数表示形式。该算法能保证找到最优的无乘数有限字长解。这是通过一个例子来说明的。
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引用次数: 30
Multi-scale zerotree entropy coding 多尺度零树熵编码
I. Sodagar, Hung-ju Lee, P. Hatrack, Bing-Bing Chai
This paper describes the visual texture compression scheme adopted for MPEG-4 international standard. The scheme is based on the concept of multiscale zerotree wavelet entropy coding (MZTE) technique that provides different levels of scalability layer in terms of either spatial resolutions or picture quality. MZTE provides much improved compression efficiency and fine-gradual scalabilities. The MZTE scheme is adopted as the baseline technique for the visual texture coding profile in both MPEG4 video group and SNHC group.
本文介绍了MPEG-4国际标准所采用的视觉纹理压缩方案。该方案基于多尺度零树小波熵编码(MZTE)技术的概念,在空间分辨率或图像质量方面提供不同级别的可扩展性层。MZTE提供了大大改进的压缩效率和精细渐进的可扩展性。在MPEG4视频组和SNHC组中,视觉纹理编码配置文件均采用MZTE方案作为基线技术。
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引用次数: 3
Parabolic approximation: a new method for phase to amplitude conversion in sine-output direct digital frequency synthesizers 抛物线近似:正弦输出直接数字频率合成器中相位与幅度转换的新方法
A. M. Sodagar, G. R. Lahiji
A new approach in sine amplitude approximation for sine-output direct digital frequency synthesizers "parabolic approximation" is presented. The proposed approximation provides an initial guess, which is much closer to the target sine amplitude than previous approximations and can be simply implemented using full-digital circuitry.
提出了正弦输出直接数字频率合成器正弦振幅近似的一种新方法——抛物线近似。所提出的近似提供了一个初始猜测,它比以前的近似更接近目标正弦振幅,并且可以简单地使用全数字电路实现。
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引用次数: 21
Physical design to improve the noise immunity of digital circuits in a mixed-signal smart-power system 提高混合信号智能电源系统中数字电路抗噪能力的物理设计
R. Secareanu, S. Warner, S. Seabridge, C. Burke, T. E. Watrobski, C. Morton, W. Staub, T. Tellier, E. Friedman
Theoretical, simulation and experimental analysis and data are presented, discussing physical design techniques which influence the noise behavior of digital circuits in a mixed-signal smart-power system. Several physical design strategies are presented to improve the noise immunity of digital circuits in smart-power systems.
本文给出了理论、仿真和实验分析和数据,讨论了影响混合信号智能电源系统中数字电路噪声特性的物理设计技术。提出了几种提高智能电源系统中数字电路抗噪声能力的物理设计策略。
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引用次数: 7
期刊
2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353)
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