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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

While the code is no longer widely used,at one time it was the most common binary transmission code.

While代码是不再广泛使用一次，这是最常见的二进制传输代码。

The fixed-base number system is widely implemented in the theoretical model of DNA arithmetic operation,such as binary number system,ternary number system.

在DNA算术运算的理论模型中，普遍应用固定基数制，比如二进制、三进制。

The binary number system is widely implemented in the model of DNA arithmetic computation,but the rippling effect caused by carry-propagation on a sum makes it difficult to realize the arithmetic computation in parallel.

在DNA算术运算的模型中普遍应用二进制，受制于进位的影响，难以实现并行运算。

Because it is more superior than that of the binary scale FSK and OOK that the binary scale moves the looks key and accuses of the system in resisting noise performance and channel communication frequency band utilization ratio etc., widely used in digital communication.

二进制移相键控方式是受键控的载波相位按基带脉冲而改变的一种数字调制方式。由于二进制移相键控系统在抗噪声性能及信道通信频带利用率等方面比二进制FSK及OOK的优越，因而被广泛应用于数字通信中。

Dynamic binary translation is widely used technology applied to virtual machine system.

动态二进制翻译是广泛应用于虚拟机系统的一种二进制代码的翻译技术。

The multi-functional BINNEY Winery store will become a high-class, most widely distributed, and international chain store dedicated for sale of Australian wines. Its mission is to make consumers buy wines in a convenient and fashionable way "just like buying birthday cakes."

宾尼酒庄集多种功能服务于一体，打造高品位的国际品牌连锁专卖店，成为中国分布最广的澳洲红酒展示窗口，让更多的消费者直接分享到"像卖生日蛋糕一样"的便利和时尚。

In practice, binocular hand-eye system is widely used.

在实际中，手-双目系统有着广泛的应用。

At the same time, it introduced the form of a binomial distribution --- a number of promotional distribution, which is a typical form in the distributed multi-dimensional discrete random variables and it's widely used in engineering and technology.

同时介绍了二项分布的一种推广形式---多项分布，该分布是多维离散型随机变量中的典型形式，在工程技术中有广泛的应用。

The sources and applications of the bioactive substance squalen that widely exists in animals and plants are reviewed.

通过查阅大量的文献资料，综述了生物活性物质角鲨烯的来源和应用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。