滤波器设计及制作

数字信号处理实训(论文)说明书

题目：滤波器设计与制作

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2013 年 7 月 7 日

滤波器的作用主要是选择所需频带的信号内容而抑制不需要的其他频带的信号内容。数字滤波器因其精度高、可靠性好、灵活性大等优点,在语音信号处理、信号频谱估计、信号去噪、无线通信中的数字变频以及图像处理等工程实际应用中都很广泛。模拟带通滤波器一般是用电路元件(如电阻、电容、电感)来构成我们所需要的频率特性电路。模拟带通滤波器的原理是通过对电容、电阻和电感参数的配置，使得模拟滤波器对基波呈现很小的阻抗，而对谐波呈现很大的阻抗，这样当负载电流信号通过该模拟带通滤波器的时候就可以把基波信号提取出来。

利用MATLAB设计滤波器,可以按照设计要求非常方便地调整设计参数,极大地减轻了设计的工作量,有利于滤波器设计的最优化。Matlab因其强大的数据处理功能被广泛应用于工程计算,其丰富的工具箱为工程计算提供了便利,利用Matlab信号处理工具箱可以快速有效地设计各种数字滤波器,设计简单方便。关键字：滤波器；MATLAB；信号处理

Filter the role of the main is to choose the frequency band of the signal required content and suppress don't need other band signal. Digital filter because of its advantages of high precision, good reliability, flexibility, in speech signal processing, signal spectrum estimation, signal denoising, wireless communication frequency and the number in the image processing and other projects in the practical application is very extensive. Analog bandpass filter is commonly used circuit components (e.g., resistor, capacitor, inductor) frequency characteristics of the circuit to make up our need. Analog bandpass filter principle is based on the capacitance, resistance and inductance parameters configuration, make simulation filter for fundamental wave appears very small impedance, and the harmonic present great impedance, so that when the load current signal through the simulation of the band-pass filter when fundamental wave signals can be extracted.

Using the MATLAB design filter, may, in accordance with the design requirements is very convenient to adjust design parameters, and greatly reduce the workload of design, and is beneficial to optimization of filter design. Matlab because of its powerful data processing functions are widely used in engineering calculation, its rich toolkit provides a convenient to engineering calculation, Matlab signal processing toolbox can be used to quickly and efficiently design all kinds of digital filter, the design is simple and convenient.

Key words: filter; MATLAB; The signal processing

目录

引言 (1)

1 滤波器 (1)

1.1 滤波器简介 (1)

1.2滤波器的原理 (2)

1.3滤波器的分类 (2)

2 带通滤波器 (2)

2.1带通滤波器的工作原理 (3)

3 硬件设计 (3)

3.1 硬件设计基本要求 (3)

3.2 硬件设计方案 (3)

3.2.1硬件设计原理图 (4)

3.2.2NE5532简介 (5)

3.3 带通滤波器的主要参数 (5)

3.4 硬件调试 (6)

4 基于MATLAB的GUI界面数字滤波器 (6)

4.1 MATALB GUI介绍 (6)

4.2 IIR滤波器 (7)

4.2.1IIR滤波器设计原理 (7)

4.2.2IIR滤波器设计思想 (7)

4.2.3IIR滤波器设计编程实现 (7)

4.3 FIR滤波器 (8)

4.3.1FIR滤波器设计原理 (8)

4.3.2FIR滤波器设计思想 (8)

4.3.3FIR滤波器设计编程实现 (8)

5 基于Matlab GUI的数字滤波器设计思路及实现 (8)

5.1“滤波器设计软件”设计的GUI界面设计 (9)

5.2控件实现编程 (10)

5.3运行和结果显示 (12)

6 总结 (12)

谢辞 (13)

参考文献 (14)

附录 (15)