【信号处理】基于matlab模拟信号处理滤波系统

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智能优化算法       神经网络预测       雷达通信       无线传感器        电力系统

信号处理              图像处理               路径规划       元胞自动机        无人机 

本文针对"信号与系统"这门课程存在物理概念抽象,学生难以理解等情况,利用MATLAB强大的图形处理功能,结合教学中的重难点,设计了基于MATLAB GUI界面的连续信号滤波处理系统.系统主要功能分数据读取和数据处理.数据读取功能主要是读取待分析的连续时间信号,读取后还可以显示该信号的时域波形和频谱图;数据处理功能主要是设计低通,高通,带通三种典型的滤波器对信号进行滤波处理,处理后的时域图和频谱图能在界面上显示出来.这样,滤波器特性,信号通过滤波器滤波前后的时频变化都可以通过这个系统进行分析.总的来说,系统可分为4个大的模块,分别是:信号读取模块,时域分析模块,滤波器设计模块,频域分析模块.每个模块内部可以对信号进行相应的操作.以实际的连续信号为例,给出了低通滤波器,高通滤波器,带通滤波器的设计,在GUI界面上进行了信号滤波仿真,比较了连续信号通过滤波器前后的效果.结果证明,利用MATLAB平台分析和处理信号与系统,不仅能加深理解,而且还能得到满意的效果.

function varargout = Lowpass(varargin)

% LOWPASS MATLAB code for Lowpass.fig

%      LOWPASS, by itself, creates a new LOWPASS or raises the existing

%      singleton*.

%

%      H = LOWPASS returns the handle to a new LOWPASS or the handle to

%      the existing singleton*.

%

%      LOWPASS('CALLBACK',hObject,eventData,handles,...) calls the local

%      function named CALLBACK in LOWPASS.M with the given input arguments.

%

%      LOWPASS('Property','Value',...) creates a new LOWPASS or raises the

%      existing singleton*.  Starting from the left, property value pairs are

%      applied to the GUI before Lowpass_OpeningFcn gets called.  An

%      unrecognized property name or invalid value makes property application

%      stop.  All inputs are passed to Lowpass_OpeningFcn via varargin.

%

%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one

%      instance to run (singleton)".

%

% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help Lowpass

% Last Modified by GUIDE v2.5 24-Jan-2015 09:39:53

% Begin initialization code - DO NOT EDIT

gui_Singleton = 1;

gui_State = struct('gui_Name',       mfilename, ...

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @Lowpass_OpeningFcn, ...

                   'gui_OutputFcn',  @Lowpass_OutputFcn, ...

                   'gui_LayoutFcn',  [] , ...

                   'gui_Callback',   []);

if nargin && ischar(varargin{1})

    gui_State.gui_Callback = str2func(varargin{1});

end

if nargout

    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});

else

    gui_mainfcn(gui_State, varargin{:});

end

% End initialization code - DO NOT EDIT

% --- Executes just before Lowpass is made visible.

function Lowpass_OpeningFcn(hObject, eventdata, handles, varargin)

% This function has no output args, see OutputFcn.

% hObject    handle to figure

% eventdata  reserved - to be defined in a future version of MATLAB

% handles    structure with handles and user data (see GUIDATA)

% varargin   command line arguments to Lowpass (see VARARGIN)

% Choose default command line output for Lowpass

handles.output = hObject;

% Update handles structure

guidata(hObject, handles);

% UIWAIT makes Lowpass wait for user response (see UIRESUME)

% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.

function varargout = Lowpass_OutputFcn(hObject, eventdata, handles) 

% varargout  cell array for returning output args (see VARARGOUT);

% hObject    handle to figure

% eventdata  reserved - to be defined in a future version of MATLAB

% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure

varargout{1} = handles.output;

% --- Executes on button press in pushbutton1.

function pushbutton1_Callback(hObject, eventdata, handles)

% hObject    handle to pushbutton1 (see GCBO)

% eventdata  reserved - to be defined in a future version of MATLAB

% handles    structure with handles and user data (see GUIDATA)

wp = str2double(get(handles.edit1,'string'));

ws = str2double(get(handles.edit2,'string'));

if wp