【滤波器】基于低通、带通、高通滤波器实现语音去噪含Matlab源码

function varargout = AMtiaozhi(varargin) % AMTIAOZHI M-file for AMtiaozhi.fig % AMTIAOZHI, by itself, creates a new AMTIAOZHI or raises the existing % singleton*. % % H = AMTIAOZHI returns the handle to a new AMTIAOZHI or the handle to % the existing singleton*. % % AMTIAOZHI( ’CALLBACK’ ,hObject,eventData,handles,...) calls the local % function named CALLBACK in AMTIAOZHI.M with the given input arguments. % % AMTIAOZHI( ’Property’ , ’Value’ ,...) creates a new AMTIAOZHI or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before AMtiaozhi_OpeningFunction gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to AMtiaozhi_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 AMtiaozhi % Last Modified by GUIDE v2.5 10-May-2010 16:42:40 % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct(’gui_Name’, mfilename, ... ’gui_Singleton’, gui_Singleton, ... ’gui_OpeningFcn’, @AMtiaozhi_OpeningFcn, ... ’gui_OutputFcn’, @AMtiaozhi_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 AMtiaozhi is made visible. function AMtiaozhi_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 AMtiaozhi (see VARARGIN) % Choose default command line output for AMtiaozhi handles.output = hObject; % Update handles structure guidata(hObject, handles); % UIWAIT makes AMtiaozhi wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = AMtiaozhi_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 during object creation, after setting all properties. function popupmenu1_CreateFcn(hObject, eventdata, handles) % hObject handle to popupmenu1 (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 set(hObject,’BackgroundColor’,’white’); else set(hObject,’BackgroundColor’,get(0,’defaultUicontrolBackgroundColor’)); end set(hObject, ’String’, {’调制信号’, ’载波信号’,’已调波信号’}); % --- Executes on selection change in popupmenu1. function popupmenu1_Callback(hObject, eventdata, handles) % hObject handle to popupmenu1 (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 popupmenu1 contents as cell array % contents{get(hObject,’ Value ’)} returns selected item from popupmenu1 % --- Executes during object creation, after setting all properties. function popupmenu2_CreateFcn(hObject, eventdata, handles) % hObject handle to popupmenu2 (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 set(hObject,’BackgroundColor’,’white’); else set(hObject,’BackgroundColor’,get(0,’defaultUicontrolBackgroundColor’)); end set(hObject, ’String’, {’高通滤波’, ’低通滤波’,’带通滤波’}); % --- Executes on selection change in popupmenu2. function popupmenu2_Callback(hObject, eventdata, handles) % hObject handle to popupmenu2 (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 popupmenu2 contents as cell array % contents{get(hObject,’ Value ’)} returns selected item from popupmenu2 % --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, eventdata, handles) popup_sel_index = get(handles.popupmenu1, ’Value’); switch popup_sel_index case 1 dt=0.01; t=0:dt:10;Fs=1/dt; e=sinc(t-5);%调制信号 elength=length(e);%求采样点个数 E=fft(e,elength);%快速傅里叶变换 %fe=-Fs/2:elength:Fs/2; En=fftshift(E);%对fft输出进行重新排列，将零频分量移到频谱中心 axes(handles.axes1); plot(t,e);title(’调制信号’); xlabel(’时间s’); ylabel(’强度值’); axis([0 10 1.1*min(e) 1.1*max(e)]); axes(handles.axes2); plot(abs(En));title(’调制信号频谱’); axis([0 1000 1.1*min(abs(En)) 1.1*max(abs(En))]); set(handles.axes2,’Xticklabel’,[-50,-30,-10,10,30,50]) xlabel(’频率Hz’); ylabel(’幅度值’); case 2 dt=0.01; t=0:dt:10;Fs=1/dt; s=cos(60*pi*t)+cos(40*pi*t)+cos(20*pi*t);%载波信号 slength=length(s);%求采样点个数 S=fft(s);%快速傅里叶变换 %fs=linspace(-Fs/2,Fs/2,slength); Sn=fftshift(S); axes(handles.axes3); plot(t,s);title(’载波信号’); xlabel(’时间s’); ylabel(’强度值’); axes(handles.axes4);plot(abs(Sn));title(’载波信号频谱’); axis([0 1000 1.1*min(abs(Sn)) 1.1*max(abs(Sn))]); set(handles.axes4,’Xticklabel’,[-50,-30,-10,10,30,50]) xlabel(’频率Hz’); ylabel(’幅度值’); case 3 dt=0.01; t=0:dt:10;Fs=1/dt; s=cos(60*pi*t)+cos(40*pi*t)+cos(20*pi*t);%载波信号 e=sinc(t-5);%调制信号 p=e.*s;%调制 plength=length(p); P=fft(p); %fp=linspace(-Fs/2,Fs/2,plength); Pn=fftshift(P); axes(handles.axes5); plot(t,p);title(’调幅信号’); xlabel(’时间s’); ylabel(’强度值’); axis([0 10 1.1*min(p) 1.1*max(p)]); axes(handles.axes6); plot(abs(Pn));title(’调幅信号频谱’); axis([0 1000 1.1*min(abs(Pn)) 1.1*max(abs(Pn))]); set(handles.axes6,’Xticklabel’,[-50,-30,-10,10,30,50]) xlabel(’频率Hz’); ylabel(’幅度值’); end % 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) p end % 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)