一、简介
基于matlab语音加噪和降噪处理
二、源代码
function varargout = zaosheng(varargin)
% ZAOSHENG MATLAB code for zaosheng.fig
% ZAOSHENG, by itself, creates a new ZAOSHENG or raises the existing
% singleton*.
%
% H = ZAOSHENG returns the handle to a new ZAOSHENG or the handle to
% the existing singleton*.
%
% ZAOSHENG('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in ZAOSHENG.M with the given input arguments.
%
% ZAOSHENG('Property','Value',...) creates a new ZAOSHENG or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before zaosheng_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to zaosheng_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 zaosheng
% Last Modified by GUIDE v2.5 09-Jun-2015 02:09:47
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @zaosheng_OpeningFcn, ...
'gui_OutputFcn', @zaosheng_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 zaosheng is made visible.
function zaosheng_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 zaosheng (see VARARGIN)
% Choose default command line output for zaosheng
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes zaosheng wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = zaosheng_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)
%%选择语音信号，画出波形图与频谱
global y;
global fs;
global bits;
global N;
global t;
global x;
global x1;
global y1;
global y2;
global y3;
global a;
global b;
global d;
H={'*.wav'};
[filename,pathname]=uigetfile(H,'请选择打开文件');
file=strcat(pathname,filename);
[y,fs,bits]=wavread(file);
y=y(:,1);
sound(y,fs);
N=length(y);
t=(0:N-1)/fs;
cla(handles.axes1);
cla(handles.axes2);
cla(handles.axes3);
cla(handles.axes4);
set(handles.axes1,'visible','on');
set(handles.axes2,'visible','on');
set(handles.axes3,'visible','off');
set(handles.axes4,'visible','off');
axes(handles.axes1);
plot(t,y);
title('原始语音信号波形');
xlabel('时间(s)');
ylabel('幅值(dB)');
y1=fft(y,1024);
f=fs*(0:511)/1024;
axes(handles.axes2);
plot(f,abs(y1(1:512)));
title('原始语音信号频谱');
xlabel('频率(Hz)');
ylabel('幅值(dB)');
set(gca,'xlim',[1 5000]);
% 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)
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
%%噪声信号波形与频谱
global y;
global fs;
global bits;
global N;
global t;
global x;
global x1;
global y1;
global y2;
global y3;
global a;
global b;
global d;
randn('state',0);
x1=0.1*randn(N,1);%产生高斯白噪声序列即噪声信号
sound(x1,fs);%播放噪声信号
cla(handles.axes3);
cla(handles.axes4);
set(handles.axes1,'visible','on');
set(handles.axes2,'visible','on');
set(handles.axes3,'visible','on');
set(handles.axes4,'visible','on');
axes(handles.axes3);
plot(t,x1);
title('高斯随机噪声波形');
xlabel('时间(s)');
ylabel('幅值(dB)');
axes(handles.axes4);
y2=fft(x1,1024);
f=fs*(0:511)/1024;
plot(f,abs(y2(1:512)));
title('高斯随机噪声频谱');
xlabel('频率(Hz)');
ylabel('幅值(dB)');
set(gca,'xlim',[1 5000]);
% 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)
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
%%加噪后语音信号波形与频谱
global y;
global fs;
global bits;
global N;
global t;
global x;
global x1;
global y1;
global y2;
global y3;
global a;
global b;
global d;
x=x1+y;
sound(x,fs);
cla(handles.axes3);
cla(handles.axes4);
set(handles.axes1,'visible','on');
set(handles.axes2,'visible','on');
set(handles.axes3,'visible','on');
set(handles.axes4,'visible','on');
axes(handles.axes3);
plot(t,x);
title('加噪后语音信号波形');
xlabel('时间(s)');
ylabel('幅值(dB)');
axes(handles.axes4);
y3=fft(x,1024);
f=fs*(0:511)/1024;
plot(f,abs(y3(1:512)));
title('加噪后语音信号频谱');
xlabel('频率(Hz)');
ylabel('幅值(dB)');
set(gca,'xlim',[1 5000]);
% 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)
三、运行结果
四、备注
版本：2014a
