IIR数字滤波器的MATLAB实现
2023-02-07 08:55:36
论文总字数:16493字
摘 要
在工程应用中针对进信号进行处理等操作,通常将所研究的信号进行滤波处理。在滤波操作中往往需要采用数学运算方式,这种运算方式被称为滤波运算。当工程人员进行到数字信号处理的操作时,第一步为针对滤波器进行设计。从功能角度,滤波器比喻为不同信号的筛选系统,使一部分信号通过该筛选系统,使另一部分信号不通过该筛选选系统。从另一个角度来看,滤波器可被定义为选频系统,例如定义为带阻、高通、带通、低通这四种选频系统。具体到实际应用中,传感器的种类有多种:比如处理模拟信号的模拟滤波器、应用于数字电路的数字滤波器、在传感器信息采集中的采样滤波器。其中数字滤波器用于处理数字信号的设备,其具有信息处理、信息传输的功能,而且设备的输入和输出都是数字量。该处理装置基本原理可做如下表示:将系统输入信号作为处理对象,依托离散系统特性,进行处理与转换操作。修改输入端信号的频率普密度及波形大小,通过有用频率,抑制无用频率。数字滤波器是以模拟滤波器为基础,将模拟滤波器加以改进得到的。数字滤波器通常有多种形式,根据其单位脉冲响应性质不同,可分为 (FIR) 以及IIR,这两种滤波器在原理中具有不同特性,但都具有一样的优异性能。例如:具备数字信号处理功能,针对不同的数字信号采取不同的处理方法。同时在处理滤波过程中,处理得到波形精度高、稳定性好、灵活性强。转换、波形过滤、分析频谱、调制解调以及编码解码等措施被广泛应用于数字信号基本处理措施。同时数字信号基本处理措施中,最具代表措施为滤波操作,该措施由于其优异性能也被广泛应用。随科技发展,越来越多的研究人员开展针对数字滤波器的相关理论研究。
关键词:模拟滤波;Matlab;数字滤波器
Studies of the Fusion and Enhancement of Image Based on the Wavelet Transform
Abstract
In the engineering application, for the processing of the incoming signal, the signal to be studied is usually filtered. In the filtering operation, it is often necessary to adopt a mathematical operation mode, which is called a filtering operation. When an engineer performs an operation on digital signal processing, the first step is to design the filter. so that a part of the signal passes through the screening system, so that another part of the signal does not pass through the screening selection system. From another perspective, the filter can be defined as a frequency selective system, such as four frequency-selection systems defined as band-stop, high-pass, band-pass, and low-pass. There are several forms of filters in industrial applications: analog filters, digital filters, and sampling filters. The digital filter is a digital signal processing device, which has a certain transmission selection function, and the signals generated at both ends of the work are digital signals. The basic principle of the processing device can be expressed as follows: the system input signal is used as a processing object, and the processing and conversion operations are performed according to the discrete system characteristics. Modify the frequency density and waveform size of the input signal, and suppress the useless frequency by the useful frequency. Digital filters are usually available in a variety of forms. They can be classified into (FIR) and IIR depending on their unit impulse response properties. These two filters have different characteristics in principle, but all have the same excellent performance. For example: with digital signal processing, different processing methods for different digital signals. At the same time, in the processing and filtering process, the processing results in high waveform precision, good stability and flexibility. Conversion, waveform filtering, spectrum analysis, modulation and demodulation, and codec are widely used in digital signal processing. At the same time, among the basic processing measures of digital signals, the most representative measure is the filtering operation, which is widely used due to its excellent performance.
Keywords: Analog Filter , Matlab , Digital filter
目 录
摘 要
Abstract
第一章 引 言
1.1 本文研究的背景意义
1.2 国内外研究现状
1.3 本文研究的内容
第二章 滤波器介绍
2.1 滤波器的定义
2.2 滤波器发展历程
2.3 滤波器的分类
第三章 滤波器的原理与设计
3.1 模拟滤波器的原理与设计
3.2 数字滤波器的原理与设计
第四章 IIR数字滤波器的设计
4.1 IIR数字滤波器简介
4.2 IIR数字滤波器的主要技术指标
4.3 IIR数字滤波器的设计过程
4.4 用脉冲相应不变法设计 IIR 数字滤波器
4.5 双线性变换法设计 IIR 数字滤波器
第六章 IIR数字滤波器的实现
5.1 IIR数字滤波器的直接设计法
第六章 结束语
致 谢
参考文献(References)
第一章 引 言
1.1 本文研究的背景意义
信号处理基础操作通常表现为对信号进行滤波操作,在工程应用中针对进信号进行处理等操作,通常将所研究的信号进行滤波处理。在滤波操作中往往需要采用数学运算方式,这种运算方式被称为滤波运算。当工程人员进行到数字信号处理的操作时,第一步为针对滤波器进行设计。数字滤波器广泛应用于信号滤波、检测等操作中,同时滤波器本身系统为一种线性系统。在开发有限冲击响应(IIR)数字滤波器过程中,可依托MATLAB软件,根据设计要求快速调整不同设计参数,降低设计的工作量与工作难度,最大化提升滤波器设计水平。
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