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along with the development of digital technology,digital filters are widely used in many fields,this paper introduces how to design a iir digital notch filters in matlab environment.the design of digital notch filters can be achieved through three steps:firstly,the design of analog lowpass filter; secondly,it is analog lowpass to analog band stop filter conversion;at last,using the bilinear transformation make the analog notch filters change into digital notch filters.the paper also introduces how to design the transfer function of the digital notch filters using all the zeros and farthest points at the same time,it also introduces the program of the digital notch filters under butterworth analog lowpass prototype.

摘 要：随着数字技术的发展，数字滤波器在许多领域得到广泛的应用。研究一种在matlab语言环境下设计iir数字陷波滤波器的方法，在数字陷波滤波器设计过程中，先进行模拟低通滤波器的设计，然后进行模拟低通/模拟带阻滤波器转换，最后采用双线性变化法将模拟陷波滤波器转化成数字陷波滤波器。提出一种用所有零点和极点来表达数字陷波器传递函数的方法，同时给出以巴特沃斯模拟低通为原型设计数字陷波滤波器的程序。关键词：无限冲激响应；巴特沃斯滤波器；数字陷波滤波器；matlab；双线性变换

In this thesis, we first discuss the algorithms of arithmetic operations over binary fields using a polynomial basis representation.

本文首先讨论了有限域上基本算术运算的算法，对有限域上的椭圆曲线理论进行了研究，分析了椭圆曲线上的核心算法——数乘算法。

Concept lattice, induced from a binary relation between objects and features, is a very useful formal tool and has been used in many fields.

而由二元关系导出的概念格则是一种非常有用的形式化工具，它体现了概念内涵和外延的统一，反映了对象和特征间的联系以及概念间的泛化与例化关系，因此非常适于发现数据中潜在的概念。

Simulation of binaural hearing environment is an important approach for the design and assessment of sound fields in buildings or cabins.

双耳听音环境仿真是设计和评价建筑或舱内声场的重要技术手段。

One bine is that some occurred earthquakes are regarded as the "cause" of coming earthquakes, that is as the occurred earthquakes produce effect on regional stress fields, which result in the occurrence of relatively strong earthquake.

一类是以已经发生的一些地震作为未来可能发生的地震的"因"，即由于已经发生的地震对区域应力场的影响，导致未来发生较强地震。

Biochip technologies are widely used in drug research, disease diagnosis, gene structure and function research, and other fields.

生物芯片技术正广泛应用于药物研究、疾病诊断、基因结构与功能研究等领域。

With the development of science and technology and the advancement of our society, many complex systems appear in various fields including traffic transportation, aviation scheduling, engineering technology, bioecology, etc.

随着科技的发展、社会的进步，在交通运输、航空调度、工程技术、生物生态学等领域出现了许多复杂的系统。

At the same time, some research fields both in theory and application of remote-sensing biogeochemistry have also been emphasized, and the fast and effective methods of prospecting for deposits have been explored in the vast vegetation regions.

同时，指出了需加强该领域的理论和应用研究，为广大植被覆盖地区寻求一种快速有效的探矿方法。

In much research of scientific fields, such as: dynamics, physics, biomathematics, economic mathematics, automatic control, and so on.

在许多科学领域的研究中，例如：力学，物理学，生物数学，经济数学，自动控制等。

One of the fastest growing fields of technology—a field of astounding recent achievements and even more ambitious hopes—is biome...

生物医学工程是目前发展最快的技术领域之一，已经取得了令人震惊的成就，并仍旧具有更广阔的发展前景。

When this condition occurs, inbound replication with the source partner is stopped on the destination domain controller and event ID 2042 is logged in the Directory Services event log.

计算机密码学是研究计算机信息加密、解密及其变换的科学，是数学和计算机的交义学科，也是一门新兴的学科。

Instructions: click on the thumbnails to see a larger image, then use the left-right arrow keys to scroll through the slideshow.

使用说明：滑鼠点在小图上即可放大观赏。开启后键盘左右键可用来换照片。