MATLAB仿真报告.doc

学 号：

序 号：

大连海事大学
作 业 设 计

题 目
信号卷积仿真
学 院
信息技术学院
专 业
电科专业
班 级
电科09-4班
姓 名

指导教师

2011
年
6
月
30
日

内容摘要
信号与系统是电类专业必修的一门重要的技术基础课，它具有基础科学和技术科学的二重性，不仅是电类学生学习后续课程的基础，也直接为解决电工电子工程中的一些实际问题服务。大二下学期开始，通过对本课程的学习，我初步掌握了近代信号与系统的一些基本知识和概念，能分析计算一些常见的，比较简单的信号处理，初步具有了解决实际问题的能力，并为后续课程的学习准备了必要的信号理论知识。在这个分析解决问题的过程中需要运用到MATLAB软件。MATLAB是矩阵实验室（Matrix Laboratory）的简称，是美国MathWorks公司出品的商业数学软件，用于算法开发、数据可视化、数据分析以及数值计算的高级技术计算语言和交互式环境，主要包括MATLAB和Simulink两大部分。
我主要是运用matlab模拟离散时间信号的卷积运算。

1 题目分析

1.设计题目
用gui设计出简单的界面，实现的功能为：点击按钮一显示sin函数，点击按钮二显示cos函数波形，点击卷积按钮显示卷积波形。
对于离散时间信号函数做卷积可以直接用内置函数conv ，如果不用内置函数的话可以先求两个函数的傅里叶变换的乘积，然后再求傅里叶逆变换，算是通用办法，此方法可以求连续时间函数的卷积，本次设计为节省时间提高效率，用的是conv函数。
界面内容包括三个按钮一个坐标轴。
实现方法如下：
1、 创建布局
使界面简洁美观，注意对齐方式与间隔。
2、 添加资源修改属性
修改string，字体大小，注意tag的标注，有可能不经意创建了多余的按钮。
3、 保存后打开m文件
2.代码分析
前面大段内容为系统内置不要动。
下面是按钮一的代码
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)
t=0:0.001:4*pi;
plot(t,sin(t));
end
axes(handles.sin(x));
实现功能为按钮一控制显示sin函数

下面是按钮二的代码
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
t=0:0.001:4*pi;
plot(t,cos(t));
end
axes(handles.cos(x));
实现功能为按钮二控制显示cos函数

下面是按钮三代码
% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton5 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
t=0:0.001:4*pi;
a=conv(sin(t),cos(t));
plot(a)
axes(handles.conv);
过程中多复制了按钮删掉就好了
实现功能为按钮三控制显示卷积函数

实验结果如下：

附录：
实验完整代码如下 ：
function varargout = lll(varargin)
% LLL M-file for lll.fig
% LLL, by itself, creates a new LLL or raises the existing
% singleton*.
%
% H = LLL returns the handle to a new LLL or the handle to
% the existing singleton*.
%
% LLL('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in LLL.M with the given input arguments.
%
% LLL('Property','Value',...) creates a new LLL or raises the
% existing singleton* Starting from the left, property value pairs are
% applied to the GUI before lll_OpeningFunction gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to lll_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 lll

% Last Modified by GUIDE v2.5 29-Jun-2011 21:58:21

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @lll_OpeningFcn, ...
'gui_OutputFcn', @lll_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin & isstr(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 lll is made visible.
function lll_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 lll (see VARARGIN)

% Choose default command line output for lll
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes lll wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = lll_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)
t=0:0.001:4*pi;
plot(t,sin(t));
end
axes(handles.sin(x));

% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
t=0:0.001:4*pi;
plot(t,cos(t));
end
axes(handles.cos(x));

% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton5 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
t=0:0.001:4*pi;
a=conv(sin(t),cos(t));
plot(a)
axes(handles.conv);
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