signal.m

语音信号端点检测仿真

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

% Last Modified by GUIDE v2.5 11-May-2006 15:33:30

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

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = signal_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)

a=wavread('neng.wav');
figure(1);
plot(a);


% --- 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)

a=wavread('neng.wav');
n=length(a);
N=320;
figure(2);
subplot(3,1,1),plot(a);
h=linspace(1,1,N);%形成一个矩形窗，长度为N
En=conv(h,a.*a);%求卷积得其短时能量函数En
subplot(3,1,2),plot(En);
b=[];
b(1)=0;
for i=2:n
  if a(i)*a(i-1)>0
      b(i)=0;
  else
      b(i)=1;
  end
end
w=[];
w(1:N-1)=0;
for i=N:n
 w(i)=0;
  for j=i-N+1:i
   w(i)=w(i)+b(j);
  end
 w(i)=w(i)/N; 
end

subplot(3,1,3),plot(w);

% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
a=wavread('neng.wav');
n=length(a);
N=320;
d=[];

for i=0:N-1
  d(i+1)=0;
  for j=1000-N+1:1000-i
  d(i+1)=d(i+1)+a(j)*a(j+i);
  end
end 

figure(3);
plot(d);