ztranstest.m

在matlab下实现了z变换

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

% Last Modified by GUIDE v2.5 08-Nov-2007 10:56:19

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

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = Ztranstest_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;



function edit3_Callback(hObject, eventdata, handles)
% hObject    handle to edit3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit3 as text
%        str2double(get(hObject,'String')) returns contents of edit3 as a double


% --- Executes during object creation, after setting all properties.
function edit3_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbutton11.
function pushbutton11_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton11 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
Fs=str2num(get(handles.edit3,'string'));
save Fs;
msgbox('录音开始！');       
wave= wavrecord(Fs, Fs, 'double');
msgbox('录音结束！');      
save wave;

figure(1);  
wavplay(wave, Fs);
subplot(2,1,1);
plot(wave);
xlabel('n');
ylabel('x(n)');
title('原始语音信号');   
subplot(2,1,2);
plot(abs(fft(wave)));
xlabel('k');
ylabel('X(k)');
title('原始语音信号频谱');

% --- Executes on button press in pushbutton12.
function pushbutton12_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton12 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
load wave
load B
load A
load Fs
    
wavel=filter(B,A,wave);
figure(2);  
wavplay(wavel, Fs);
subplot(2,1,1);
plot(wavel);
xlabel('n');
ylabel('y(n)');
title('滤波后语音信号');  
subplot(2,1,2);
plot(abs(fft(wavel)));
xlabel('k');
ylabel('Y(k)');
title('滤波后语音信号频谱');

% --- Executes on button press in pushbutton13.
function pushbutton13_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton13 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
B=str2num(get(handles.edit5,'string'));
A=str2num(get(handles.edit6,'string'));
save B
save A
P=roots(B);
Z=roots(A);
zorenum=length(B)-length(A);
if(zorenum>0)
    Z=[zeros([abs(zorenum),1])
      Z];
end
if(zorenum<0)
    P=[zeros([abs(zorenum),1])
      P];
end
           
h_list=findobj('tag','listbox5');
set(h_list,'string',num2str(P));

h_list=findobj('tag','listbox6');
set(h_list,'string',num2str(Z));


axes(handles.axes5);
ZPLANE(P,Z);
xlabel('Real(z)');
ylabel('Imeg(z)');  
title('滤波器零极点图');

[h,w]=freqz(B,A,512);
axes(handles.axes6);
plot(w/pi,20*log10(abs(h)));
xlabel('w/pi');
ylabel('幅度(db)');    
title('滤波器幅频衰减特性');


% --- Executes on selection change in popupmenu3.
function popupmenu3_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns popupmenu3 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu3


% --- Executes during object creation, after setting all properties.
function popupmenu3_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbutton14.
function pushbutton14_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton14 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
message={
   ' 画出满足差分方程:',
    '    y[n]-1.25y[n-1]+0.75y[n-2]-0.125y[n-3]=x[n]+0.5x[n-1]',
  '的滤波器的零极点图。给出分析、源文件和输出的零极点图。'
   };
   msgbox(message)

% --- Executes on button press in pushbutton15.
function pushbutton15_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton15 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
message={
   '中科院上海应用物理所',
   '生物特征识别实验室',
   '学号：SC07023122',
   '王靖琰'
   };
   msgbox(message)

% --- Executes on selection change in listbox5.
function listbox5_Callback(hObject, eventdata, handles)
% hObject    handle to listbox5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns listbox5 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from listbox5


% --- Executes during object creation, after setting all properties.
function listbox5_CreateFcn(hObject, eventdata, handles)
% hObject    handle to listbox5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: listbox controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on selection change in listbox6.
function listbox6_Callback(hObject, eventdata, handles)
% hObject    handle to listbox6 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns listbox6 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from listbox6


% --- Executes during object creation, after setting all properties.
function listbox6_CreateFcn(hObject, eventdata, handles)
% hObject    handle to listbox6 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: listbox controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end





function edit4_Callback(hObject, eventdata, handles)
% hObject    handle to edit4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit4 as text
%        str2double(get(hObject,'String')) returns contents of edit4 as a double


% --- Executes during object creation, after setting all properties.
function edit4_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function edit5_Callback(hObject, eventdata, handles)
% hObject    handle to edit5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit5 as text
%        str2double(get(hObject,'String')) returns contents of edit5 as a double


% --- Executes during object creation, after setting all properties.
function edit5_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function edit6_Callback(hObject, eventdata, handles)
% hObject    handle to edit6 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit6 as text
%        str2double(get(hObject,'String')) returns contents of edit6 as a double


% --- Executes during object creation, after setting all properties.
function edit6_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit6 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end