双

A design method of switched-currentladder filters using the bilinear transformation is proposed.

开关电流梯形滤波器的双线性变换设计孟相如，邱关源（西安交通大学电气系，西安710049）本文提出了一种用双线性变换进行开关电流梯形滤波器设计的方法。

We proposed the simplest structure of 2-D bilinear transformation digital circuit, we proposed four approaches of the realizations:(1) Realization of 2-D discrete domain difference equations;(2) 2-D FFT realization;(3) Digital hardware implementation;(4) by 2-D recursive digital structure to realize them.

在第七章，我们则重点研究了二维数字滤波器的实现问题。我们对第六章提出的2-D双线性变换电路又作了进一步的简化，获得了一种最简结构的二维双线性变换数字电路，该电路仅有二个延时器和一个乘法器。在第七章里，我们提出了二维跳耦型数字滤波器的四种实现方法：(1)二维时域差分方程实现；(2)二维FFT实现；(3)数字硬件实现，(4)用2-D递归数字结构实现。

Abstraction :This paper analyzes the principle of Butterworth digital filter,discuss bilinear transformation method of filter design;record a piece of voice by Microsoft voice recorders, carry on its a time-domain analysis, spectral analysis;then design a specified Butterworth band-stop filter based on the theory of bilinear transform,analyze the filter by the tool named Fvtool;and filter the voice signal acquired by voice recorder.finally compare its characteristics of frequency domain and time domain,study the applications of Butterworth filter in digital signal processing ,in particular in signal denoising.

本文分析了巴特沃思数字滤波器的原理，探讨了双线性变换法设计滤波器的方法；用微软录音机采集一段语音，对其进行了时域分析，频谱分析；然后使用双线性变换法设计了一个的巴特沃思带阻滤波器，并且使用fvtool对设计的滤波器进行分析；然后利用该滤波器对采集的语音信号进行滤波。最后对比滤波前后的语音信号的时域和频域特性，研究了巴特沃思滤波器在信号处理尤其是信号滤波去噪方面的特性和应用。

The 2-D bilinear transformation digital circuit from 1-D analog domain to 2-D discrete domain has been presented, which can ensure the exact realization of 1-D to 2-D bilinear transformation.

将此二维双线性变换数字电路用于2-D跳耦型数字滤波器的电路中，即可获得一种新的，稳定的二维数字滤波器实现。同二维波数字滤波器一样，2-D跳耦型数字滤波器亦以1-D无源LC双端接载梯型滤波器为导出原型。

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

A heat source overheat protector in medical instrument consists of one radiator which is connected with medical instrumental light source mounting rack, said medical instrument set with light source control main circuit, bimetallic strip temperature control unit set nearing the light source mounting rack and series connected in said main circuit through wire.

一种医用仪器中热源过热保护装置，由一个散热器构成，散热器与医用仪器的光源安装架连接，医用仪器中设置有控制光源的主电路，散热器靠近光源安装架的位置设置有一个双金属片温控器，双金属片温控器通过导线串联在所述的主电路中。

This paper is mainly to instruct some common bimetallic bearing material and combination technology.

本文主要介绍一些常用的双金属轴承材料以及双金属轴承材料与钢背的复合工艺。

Maybe structure of linear trend is generated in the way different from structures of time series after removing the trend, and bimodal distribution is the result of their interaction.

双峰的出现可能是因为线性趋势和去趋之后的时间序列中的结构有不同的产生机制，因而有不同的概率分布，两者的叠加就出现了双峰。3。

High density polyethylene with wide or bimodal molecular weight distribution was prepared by using bimetallic composite catalysts.

采用双金属复合催化剂制备出了宽或双峰分子量分布的高密度聚乙烯，并对所合成出的聚合物进行了结晶行为分析、分子量及分子量分布测试。

General manager of the company with the whole staff welcomes new and old customers to visit bimodal, bimodal understanding.

公司总经理林宗春携全体员工热忱欢迎新老顾客光临双峰，了解双峰。

What would he tell Judith and the children?

他将怎样告诉朱迪丝和孩子们呢？

I this is at that time, the opinion with peacockish true girl is full of in a heart.

这就是当时的我，一个心中布满虚荣的女孩子真实的想法。