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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

A 3kW prototype converter is built to verify the effectiveness of the improved converter and the best scheme for the blocking capacitor, and the experimental results are also included in this paper.

本文将改进型零电压全桥变换器应用于高压直流二次电源DC／DC变换器中，研制出一台3kW工程样机，并给出实验结果。

"COOL RUNNINGS" is based on a true story. The prototype, Jamaican bobsled team, has been an eternal miracle in sports history.

影片根据真人真事改编，故事原型牙买加有舵雪橇队是体育史上一个永远的奇迹。

B: Yes, he had had a pig is his greatest friend, called "Bock" is a prototype Nazhi idiot.

乙：是的，他以前有一只最大的猪是他的好朋友，叫"波克"就是那只蠢猪的原型。

The introduction of machines, it's actually just some prototype, but of great importance, for cards and membership cards to make the technical development has set a boilerplate.

这些引进的机器，实际上仅仅是一些样机，但意义重大，为制卡和会员卡制作技术的发展树立了样板。

But in order for the bolometer to work reliably, it needs to become even more sensitive, and maintain that sensitivity as it's scaled up from the 46-gram prototype to a half-ton working model, said Rick Gaitskell, a Brown University physicist who was not involved in the research.

不过，据布朗大学物理学家里克·盖茨凯尔介绍，若要保证辐射热测量仪可靠运行，则必须令其敏感度更高，而且，当把它从46克的样机变成0.5吨重的实用模式时，还必须维持这种敏感度。

Two sets of simulation data and real borehole sample data are used to verify the prototype system developed in VC++.

以模拟数据和地质钻探数据对开发的原型系统进行验证。

The prototype can generate 2-D and 1-D style layout with pins/terminals on and inside the boundary of the cell, meanwhile area and timing being optimized.

系统可生成二维和一维的标准单元版图，并允许引脚端出现在单元内部，版图比较紧凑，同时性能得到优化。

In this strategy, the unknown nonlinear functions are approximated by the fuzzy tree model to obtain the prototype controller; the linear parameters in the fuzzy tree model are adjusted online to improve the performance of the controller in realizing the tracking control to a bounded set point input.

该方法用模糊树模型逼近非线性系统中的未知非线性函数，得到初始的控制器，然后在线调节模糊树模型中的线性参数，改善控制器的性能，实现对有界参考输入信号的跟踪控制。

By 1971, Boyd was working for the Air Force Prototype Study Group.

在1971年，Boyd在空军原型研究小组工作。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。