数位模拟

The project will develop a bandpass sigma-delta analog-to-digital converter for digital audio broadcasting system in three years. In the first year, we had finished the system simulation for IF receiver using conventional high speed ADC and bandpass sigma-delta ADC, respectively. We also had done the analysis and design of high-order bandpass sigma-delta modulator structure. In this year, we have developed a coefficient synthesis method for high order bandpass sigma-delta modulator using high order filter transfer functions (inverse Chebyshev bandreject filter function).

本计划将在三年内发展一个能应用在数位音讯广播系统的带通sigma-delta类比/数位转换器(analog-to-digital converter，ADC)，在第一年度中我们分别以传统高速类比/数位转换器及带通SD类比/数位转换器的接收系统为例，并结合编码正交多工器(Coded Orthogonal Frequency Division Multiplex，COFDM)的技术，建立一套DAB系统模拟的方法，同时并研究有关高阶带通SD类比/数位调变器的架构及电路，并已成功开发出一个由高阶滤波器合成的高阶带通调变器。

To learn the principles of combinational and sequential logic circuits and to be familiar with the basis of digital system. The course will cover the contents of VHDL and the principles of CPLD/FPGA.

本课程之目标在於帮助学生了解数位系统中组合及序向逻辑的原理及设计方法，以建立数位系统设计之基础，并辅以VHDL硬体描述语言的模拟实习以验证理论并熟悉CPLD/FPGA之原理。

English Description In this course, the VLSI design and fabrication process will be introduced. The students will learn about the characteristics of transistors, digit circuit design methodologies, and system architectures for VLSI. EDA tools will be used in this course to assist in designing the circuit and performing simulations.

Chinese Description 本课程将介绍何谓超大型积体电路及其制程与电晶体基本特性，以及数位电路设计之方法和超大型积体电路系统结构，并使用EDA工具协助电路设计、布局及模拟。

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In order to judge the grade of pimento, some parameters are extracted from two-dimensional image of pimento. These extracted parameters consist of length, width, perimeter, projected area, projected area to squared perimeter ratio, and width to length ratio. The extracted parameters and grade of pimento judged by experienced workers are used as input and desired patterns to estimate the connection weights of neural network. In this paper, a three-layer feed-forward neural network and back-propagation learning algorithm are suggested for the shape and size grading of pimento.

本文以青椒为对象，首先利用数位影像处理技术从人工分级后的各等级产品的影像中萃取出周长、投影面积、长度、宽度、投影面积对周长平方比与宽度对长度比等可作为判断青椒等级的分级准则，再利用多层前馈式类神经网路来模拟农产品的分级作业，并采用反向传递演算法学习各项分级准则与等级判断结果间的关系，以量化了解各项分级准则对等级判断结果的影响程度。

Computer simulation results of communication performance of the portable radiophone influenced by the human body are useful for the antenna/RF design and the link budget consideration of the portable wireless communication systems.

配合适当的数位调变讯号，计算模拟通讯EVM及BER之性能，如此可评估了解在无线都市行动通讯中，人体耦合效应对通讯品质的影响，对天线/射频设计及链路预估皆有相当的帮助。

This thesis presents detailed analysis and computer simulation of the influence of the operator's body on the performance of the portable radiophone in urban mobile environments. An approach called modified Doppler power spectrum method is proposed to study this problem.

论文提出改良式都卜勒功率频谱法、及直接分离式多重路径法来分析并模拟计算，通讯性能评估系架构在错误向量量度及位元错误率，电脑模拟使用之调变系统为数位调频及π/4-DQPSK。

The glottal flow derivative is estimated by using an inverse filtering technique which obtained from the vocal tract system which is established by large database of x-ray pictures and simulated by digital signal processing multiplies the frequency domain value of the original speech signals.

声门来源波型的取得是利用大量X光为基础而以数位讯号方式模拟人体口腔模型而将所需要的反函数求出再将之与原语音的频谱图做相乘而得之。

Results In static phantom studies, the percent error of mean activity obtained by Carson's method was reduced to about 9 %, and it is less than that of image-derived method using maximum likelihood expectation maximization (about 14 %). In simulated dynamic phantom studies, the vessel component could be extracted using ICA in image and sinogram domain. In sinogram domain, the six components extracted by ICA could be obtained quickly.

在静态物理假体实验结果来看，使用Carson's method计算出感兴趣区域活性的百分比误差( 9%)比直接从影像取得活性的百分比误差( 14%)来得小；从数位模拟动态假体实验结果来看，独立成份分析法运用在影像空间或是弦波图空间上，都可以将血管分离出来，但从弦波图空间上得到各个独立成份相对於影像空间就快得多；imageICA和sinogramICA计算出的输入函数的标准化均方根误差分别是0.57和0.28。

First, we introduce the principle of feeder protective apparatus and select adequate protective equipments in accordance with different types of distribution system, using the least square error method to simulate the time/current curve and applicate simulation formula to digital the curve data, Secondary, using augmented incidence matrix method to find the exact pairs of primary/backup protection relay and find the relay tripping sequence of distribution lines.

首先介绍线路之过电流保护设备动作原理，依不同之配电系统型态来选用适当之保护设备种类，并使用最小平方误差法模拟保护电驿之时间－电流特性曲线，应用模拟方程式将曲线之资料数位化，且藉由图形理论中之增广关联矩阵法求取正确之主保护与后卫保护电驿对，以找出系统中各配电线路保护电驿间之跳脱顺序关系。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了