delay.m

很多matlab的源代码

function varargout = echo(varargin)
% DELAY M-file for delay.fig
%      DELAY, by itself, creates a new DELAY or raises the existing
%      singleton*.
%
%      H = DELAY returns the handle to a new DELAY or the handle to
%      the existing singleton*.
%
%      DELAY('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in DELAY.M with the given input arguments.
%
%      DELAY('Property','Value',...) creates a new DELAY or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before delay_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to delay_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 delay

% Last Modified by GUIDE v2.5 17-May-2004 19:36:51

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @delay_OpeningFcn, ...
                   'gui_OutputFcn',  @delay_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 delay is made visible.
function delay_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 delay (see VARARGIN)

% Choose default command line output for delay
handles.output = hObject;
[y,fs,bits]=wavread('Laser');
x=y(:,1);
axes(handles.axes1);
plot(x);
title('Original signal');
N1=2000;
N2=2*N1;
d=[1 zeros(1,N1-1) 0.9 zeros(1,N1-1) 0.8];
n=[1 zeros(1,N2)];
y1=conv(x,d);
axes(handles.axes2);
plot(y1);
title('Echo signal');
y2=filter(n,d,y1);
axes(handles.axes3);
plot(y2);
title('Noecho signal');
axes(handles.axes4);
nn=0:length(d)-1;
h=stem(nn,d);
title('Echoing Filter');
set(h,'Linewidth',2);
set(h,'MarkerSize',1);
axes(handles.axes5);
xx=[1 zeros(1,20000)];
h2=filter(n,d,xx);
nn=0:length(h2)-1;
h_2=stem(nn,h2);
title('Inverse Filter');
set(h_2,'Linewidth',2);
set(h_2,'Linewidth',1);

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = delay_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 info.
function info_Callback(hObject, eventdata, handles)
% hObject    handle to info (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --- Executes on button press in radiobutton1.
function radiobutton1_Callback(hObject, eventdata, handles)
% hObject    handle to radiobutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton1
set(handles.radiobutton1,'value',1);
set(handles.radiobutton2,'value',0);
set(handles.radiobutton3,'value',0);
[y,fs,bits]=wavread('Laser');
x=y(:,1);
sound(x,fs);

% --- Executes on button press in radiobutton2.
function radiobutton2_Callback(hObject, eventdata, handles)
% hObject    handle to radiobutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton2
set(handles.radiobutton1,'value',0);
set(handles.radiobutton2,'value',1);
set(handles.radiobutton3,'value',0);
[y,fs,bits]=wavread('Laser');
x=y(:,1);
N1=2000;
h1=[1 zeros(1,N1-1) 0.9 zeros(1,N1-1) 0.8];
y1=conv(x,h1);
sound(y1,fs);

% --- Executes on button press in radiobutton3.
function radiobutton3_Callback(hObject, eventdata, handles)
% hObject    handle to radiobutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton3
set(handles.radiobutton1,'value',0);
set(handles.radiobutton2,'value',0);
set(handles.radiobutton3,'value',1);
[y,fs,bits]=wavread('Laser');
x=y(:,1);
N1=2000;
N2=2*N1;
d=[1 zeros(1,N1-1) 0.9 zeros(1,N1-1) 0.8];
n=[1 zeros(1,N2)];
y1=conv(x,d);
y2=filter(n,d,y1);
sound(y2,fs);


% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
N1=2000;
d=[1 zeros(1,N1-1) 0.9 zeros(1,N1-1) 0.8];
n=[1];
figure
H1=freqz(n,d,1024);
H2=freqz(d,n,1024);
w=(0:1024-1)/1024*pi;
subplot(3,1,1);
plot(w,abs(H1));
title('Amplitude Spectrum of the Echoing Filter');
subplot(3,1,2);
plot(w,abs(H2));
title('Amplitude Spectrum of the Inverse Filter');subplot(3,1,3);
plot(w,abs(H1).*abs(H2));
title('The Production of Amplitude spectrum Above');