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介绍在Matlab环境下用窗函数设计FIR数字滤波器的方法,并通过实例进行比较和分析,仿真表明,设计结果的各项性能指标均达到指定要求。 相似文献
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本文介绍了用数字信号处理器TMS 32020实现高精度FIR线性相位数字滤波器的方法。采用智能化元件,辅以单板机进行开发和管理而构成的数字滤波器,系统配置量小、可靠性高、稳定性好。理论设计与实测结果比较,表明它具有一定的实用价值。 相似文献
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本文以窗函数法为例,介绍了FIR滤波器的设计理念,以及讨论了采用MATLAB程序法对该技术的仿真设计过程。实践证明,此种滤波器的设计方法可以很好地实现各种FiR滤波器的设计,能在现代电子系统设计中得到广泛应用,具有一定的工程实践价值。 相似文献
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FIR滤波器克服了IIR滤波器的缺点,使滤波器更稳定,同时也有了严格的线性相位特性。用FIR设计滤波器是选择有限长度的h(n),是传输函数H(e^jw)满足技术要求。其中窗函数法是一种重要的FIR滤波器的设计方法,用MATLAB编写程序设计FIR数字滤波器。 相似文献
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MATLAB语言的程序设计,简洁有效,程序的可读性很强,调用容易。用Matlab语言实现低通FIR滤波器,并对仿真信号进行滤波,达到预期的效果。 相似文献
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在表面测量数据采集系统中,针对抗混叠滤波器设计问题,提出了“模拟滤波器+数字滤波器”的设计方法.设计了具有线性相位的有限脉冲响应(FIR)型抗混叠数字滤波器,得出了幅频特性和相频特性,满足了表面测量信号处理的要求.与传统的单纯模拟抗混叠滤波器相比,该方法有效降低了对模拟滤波器的设计要求,使其易于实现,滤波效果好.把该方法应用于表面测量系统中,通过对实测数据的应用试验,验证了滤波器的性能. 相似文献
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介绍基于快速傅立叶变换FFT、褶积镶边理论以及线性相位理论所开发出的FIR数字滤波系统及工作原理。成功开发出的FIR数字滤波系统在数字信号处理的专业应用上,对连续信号能高效地进行数字高通、数字低通、数字带通及数字带阻四种功能的滤波处理,系统设计所采用的优化分析和处理方法使其幅相频特性比较理想,从而保证输出信号在较高的精度上没有幅值和相位失真;在控制方式上具有比硬件控制及软硬结合控制较大的优越性:变参数输入的灵活性、分析结果系统内输出的多样性、面向对象应用软件使用上的友好性、可移植性、再开发性、可维护性、开发周期的高效性和费用的便宜性等。分析结果表用,FIR数字滤波系统用于实际的滤波处理是稳定并且可靠的。 相似文献
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针对扫描图像,提出了一种基于FIR 数字低通滤波器的去网方法,该方法是将图像从空间域转换到频率域,对频率域图像进行FIR 低通滤波处理,结合图像评价指标PSNR,选择最优的滤波器参数。用该去网算法与常用的去网算法进行了比较,结果表明,该去网算法在达到去网效果的同时能够更好地保留边缘信息。 相似文献
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比相法是一种高精度的频标比对方法。但在较高比相频率下,非线性误差的影响不容忽略。本文分析了线性比相器在0°(360°)附近比相时产生非线性误差的原因,提出了采用倒相方法克服比相器非线性的措施,提高了比相器在较高比相频率下的测量精度 相似文献
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提出了一种基于余弦基神经网络FIR滤波器的设计方法。根据线性相位FIR滤波器的幅频特性是有限项的傅里叶级数,构造了一个三层余弦基神经网络模型,并给出了最优隐层神经元的个数。经模拟仿真,滤波器性能非常理想,具有同时输出低通、高通、带通、带阻各种功能,通带、阻带无过冲无波动,边界频率可以精确控制。 相似文献
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Most of the existing literature on phase I control of simple linear profiles requires multiple observations because the profile parameters need to be estimated given each subgroup of observations. Such a requirement may not be attainable in practical applications in that the observations collected in phase I for assessing whether the process is in control and estimating the profile parameters may not necessarily follow what is prescribed by the existing phase I methods. This is particularly the case for processes in which only few observations or a single observation per subgroup can be obtained for phase I control. In this work, a control charting mechanism based on a change‐point model is proposed for phase I control of simple linear profiles with individual observations. The proposed charting mechanism consists of two control charts. The first control chart, which is essentially based on a likelihood ratio test, is used to monitor the profile parameters. The error standard deviation is monitored using a second control chart, which is constructed on the basis of the recursive residuals. Simulation results show that the control charting mechanism is effective in detecting sustained changes in the profile parameters and/or error standard deviation. The proposed phase I control charting mechanism is used in an application to demonstrate how the proposed control charts can be applied in practice. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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介绍一种新型滤波器的工艺设计、工艺实现,提出了分段加工整体焊接的方法,解决了薄壁、深孔加工工艺问题,分析了其加工工艺特点和实现方法.电检测结果满足该滤波器的性能要求. 相似文献
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Stephen Görner Alexander Potchinkov Rembert Reemtsen 《Optimization and Engineering》2000,1(2):123-154
FIR filter design problems in the frequency domain are nonlinear (semi-infinite) optimization problems. In practice, however, these almost always have not been approached directly, but been solved in a simplified form and/or only under restricting assumptions. In this paper, quite general mathematical formulations of the four main design approximation problems in the frequency domain are presented, which enable the derivation of theoretical results (collected here from R. Reemtsen, 2000b, 2000c) and the application of general-purpose optimization procedures to their direct solution. For the actual solution, a nonlinear semi-infinite programming method from the thesis (S. Görner, Ph.D. Thesis, Technische Universität Berlin, Berlin, 1997) of the first author is discussed and applied to several specific design problems. In some cases, the computed solution of the nonlinear problem is compared with that of a convex approximation of the problem. 相似文献
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本文对阶梯阻抗线微带谐振器(SIR)进行了研究,基于一般SIR模型设计了一个类SIR谐振器。由该谐振器构建的BPF不仅可使微带线BPF的尺寸小型化,而且可以控制微带线BPF寄生响应的位置。该谐振器更容易进行细微的调节与优化。利用所提出的谐振器结构设计了一个具有准椭圆函数响应特性的4阶超导带通滤波器,用全波分析软件进行了仿真与优化,并对所设计的超导滤波器进行了测试,结果表明,实际测试结果与理论响应符合良好。 相似文献
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Mahmoud A. Mahmoud Abd El Naser Saad Reham El Shaer 《Quality and Reliability Engineering International》2015,31(5):851-861
In some statistical process control applications, the quality of a process or product is best represented by a functional relationship between a response variable and one or more explanatory variables. Different methods have been proposed in the literature to monitor phase II multiple linear regression profile. Most of the existing approaches assume the number of sample observations to be greater than the number of explanatory variables, a condition needed to estimate the model parameters and establish chart statistics. In practice, however, the sample size can be smaller than the number of the multiple linear regression parameters. None of the previous studies of multiple regression profiles approaches have tackled this problem. In the current study, two methods are proposed to handle the problem of profile monitoring with sample sizes smaller than the number of regression parameters. Simulation results show that both methods outperform the existing methods in the literature used to monitor multiple linear regression profile. Moreover, both methods work satisfactorily when existing methods cannot be applied, that is, when the sample size is smaller than the number of profile parameters. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献