?1 簡介

針對傳統(tǒng)的濾波器設(shè)計方法效率低,方法復(fù)雜,不能滿足高效高精度的需要等缺點,基于 MATLAB 研究了分別使用窗函數(shù)法和雙線性變換法的 FIR 和 IIR 濾波器.將加入噪聲的信號分別通過兩種濾波器,濾除加入的噪聲,對濾波前后的信號進行對比分析.通過仿真實驗表明, FIR 濾波器與 IIR 的 Butterworth 濾波器都能很好地克服傳統(tǒng)濾波器的不足,通過語譜圖直觀地對比發(fā)現(xiàn)基于窗函數(shù)法設(shè)計 FIR 濾波器比雙線性法設(shè)計的 Butterworth 濾波器能更好地達到預(yù)定的去噪效果.

2 部分代碼

function varargout = filter_2(varargin)% FILTER_2 MATLAB code for filter_2.fig% ? ? ?FILTER_2, by itself, creates a new FILTER_2 or raises the existing% ? ? ?singleton*.%% ? ? ?H = FILTER_2 returns the handle to a new FILTER_2 or the handle to% ? ? ?the existing singleton*.%% ? ? ?FILTER_2('CALLBACK',hObject,eventData,handles,...) calls the local% ? ? ?function named CALLBACK in FILTER_2.M with the given input arguments.%% ? ? ?FILTER_2('Property','Value',...) creates a new FILTER_2 or raises the% ? ? ?existing singleton*. ?Starting from the left, property value pairs are% ? ? ?applied to the GUI before filter_2_OpeningFcn gets called. ?An% ? ? ?unrecognized property name or invalid value makes property application% ? ? ?stop. ?All inputs are passed to filter_2_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 filter_2% Last Modified by GUIDE v2.5 16-May-2013 12:02:23% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name', ? ? ? mfilename, ... ? ?'gui_Singleton', ?gui_Singleton, ... ? ?'gui_OpeningFcn', @filter_2_OpeningFcn, ... ? ?'gui_OutputFcn', ?@filter_2_OutputFcn, ... ? ?'gui_LayoutFcn', ?[] , ... ? ?'gui_Callback', ? []);if nargin && ischar(varargin{1}) ? ?gui_State.gui_Callback = str2func(varargin{1});endif 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 filter_2 is made visible.function filter_2_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 filter_2 (see VARARGIN)global response;global analog;global window1;global digital;global analog_choose;response=1;analog=1;analog_choose=1;window1=1;digital=1;%set(handles.function_value,'String','Butterworth');%set(handles.method_value,'String','direct form');set(handles.order,'Enable','off');% Choose default command line output for filter_2handles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes filter_2 wait for user response (see UIRESUME)% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.function varargout = filter_2_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 structurevarargout{1} = handles.output;% --- Executes on button press in IIR_button.function IIR_button_Callback(hObject, eventdata, handles)% hObject ? ?handle to IIR_button (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB% handles ? ?structure with handles and user data (see GUIDATA)global ?analog_choose;global response;global analog;if(get(hObject,'Value')==1) ?%當選中IIR時屏蔽FIR模塊 ? ?set(handles.order_information,'String','order'); ? ?set(handles.FIR_button,'Value',0); ? ?set(handles.filter_information,'String','IIR'); ? ?set(handles.window_function,'Enable','off'); ? ?set(handles.order,'Enable','off'); ? ?set(handles.view_window,'Enable','off'); ? ?set(handles.analog_filter,'Enable','on'); ? ?set(handles.Apass,'Enable','on'); ? ?set(handles.Astop,'Enable','on'); ? ?set(handles.order,'Enable','off'); ? ? ? ? set(handles.specify_order,'Enable','on'); set(handles.specify_order,'Value',0);%對階數(shù)的處理 ? ? ? ? set(handles.custom_order,'Enable','on');set(handles.custom_order,'String',''); ? ? ? ?set(handles.min_order,'Enable','on');set(handles.min_order,'Value',0); ? ? ? ?%get(handles.analog_method,'Value'); ? ?if( analog_choose==1) ? ? ? ?set(handles.method_value,'String','direct form'); ? ?else ? ? ? ?set(handles.method_value,'String','bilinear'); ? ?end ? ?switch(analog) ? ? ? ?case 1 ? ? ? ? ? ?set(handles.function_value,'String','Butterworth'); ? ? ? ?case 2 ? ? ? ? ? ?set(handles.function_value,'String','chebyshev1'); ? ? ? ?case 3 ? ? ? ? ? ?set(handles.function_value,'String','chebyshev2'); ? ?end ? ?switch(response) ? ? ? ?case 1 ? ? ? ? ? ?set(handles.type_information,'String','Lowpass'); ? ? ? ?case 2 ? ? ? ? ? ?set(handles.type_information,'String','Highpass'); ? ? ? ?case 3 ? ? ? ? ? ?set(handles.type_information,'String','Bandpass'); ? ? ? ?case 4 ? ? ? ? ? ?set(handles.type_information,'String','Bandstop'); ? ?endelse ? ?set(handles.window_function,'Enable','on'); ? ?set(handles.order,'Enable','on'); ? ?set(handles.view_window,'Enable','on'); ? ?set(handles.order,'Enable','on');end% Hint: get(hObject,'Value') returns toggle state of IIR_button% --- Executes on button press in FIR_button.function FIR_button_Callback(hObject, eventdata, handles)% hObject ? ?handle to FIR_button (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB% handles ? ?structure with handles and user data (see GUIDATA)global digital;global response;global window1;if(get(hObject,'Value')==1) ?%當選中FIR時屏蔽IIR模塊 ? ?set(handles.IIR_button,'Value',0); ? ?set(handles.filter_information,'String','FIR'); ? ?set(handles.window_function,'Enable','on'); ? % set(handles.order,'Enable','on'); ? ?set(handles.view_window,'Enable','on'); ? ?set(handles.analog_filter,'Enable','off'); ? ?set(handles.Apass,'Enable','off'); ? ?set(handles.Astop,'Enable','off'); ? ?%set(handles.order,'Enable','on'); ? ? if(digital==2)%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%處理階數(shù) ? ? ? ?set(handles.specify_order,'Enable','off'); ? ? ? ?set(handles.custom_order,'Enable','off'); ? ? ? ?set(handles.min_order,'Enable','off'); ? ? ? ?set(handles.window_function,'Enable','off'); ? ? ? ?set(handles.view_window,'Enable','off'); ? ? ? ?set(handles.order_information,'String','sample') ? ? ? ?set(handles.order,'Enable','on'); ? ? ? ?end ? ? ? ?switch(response) ? ? ? ?case 1 ? ? ? ? ? ?set(handles.type_information,'String','Lowpass'); ? ? ? ?case 2 ? ? ? ? ? ?set(handles.type_information,'String','Highpass'); ? ? ? ?case 3 ? ? ? ? ? ?set(handles.type_information,'String','Bandpass'); ? ? ? ?case 4 ? ? ? ? ? ?set(handles.type_information,'String','Bandstop'); ? ?end ? ?if(digital==1) ? ? ? ?set(handles.method_value,'String','window'); ? ?else ? ? ? ?set(handles.method_value,'String','FSI'); ? ?end ? ?switch(window1) ? ? ? ?case 1 ? ? ? ? ? ?set(handles.function_value,'String','Hamming'); ? ? ? ?case 2 ? ? ? ? ? ?set(handles.function_value,'String','Blackman'); ? ? ? ?case 3 ? ? ? ? ? ?set(handles.function_value,'String','Hann'); ? ? ? ?case 4 ? ? ? ? ? ?set(handles.function_value,'String','Rectangular'); ? ?endelse ? ?set(handles.analog_filter,'Enable','on'); ? ?set(handles.Apass,'Enable','on'); ? ?set(handles.Astop,'Enable','on'); ? ?set(handles.order,'Enable','off'); ? ?end% Hint: get(hObject,'Value') returns toggle state of FIR_button% --- If Enable == 'on', executes on mouse press in 5 pixel border.% --- Otherwise, executes on mouse press in 5 pixel border or over filter_information.function filter_information_ButtonDownFcn(hObject, eventdata, handles)% hObject ? ?handle to filter_information (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB% handles ? ?structure with handles and user data (see GUIDATA)function Fs_edit_Callback(hObject, eventdata, handles)% hObject ? ?handle to Fs_edit (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 Fs_edit as text% ? ? ? ?str2double(get(hObject,'String')) returns contents of Fs_edit as a double% --- Executes during object creation, after setting all properties.function Fs_edit_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to Fs_edit (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');endfunction Fstop1_edit_Callback(hObject, eventdata, handles)% hObject ? ?handle to Fstop1_edit (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 Fstop1_edit as text% ? ? ? ?str2double(get(hObject,'String')) returns contents of Fstop1_edit as a double% --- Executes during object creation, after setting all properties.function Fstop1_edit_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to Fstop1_edit (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');endfunction Fpass1_edit_Callback(hObject, eventdata, handles)% hObject ? ?handle to Fpass1_edit (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 Fpass1_edit as text% ? ? ? ?str2double(get(hObject,'String')) returns contents of Fpass1_edit as a double% --- Executes during object creation, after setting all properties.function Fpass1_edit_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to Fpass1_edit (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');endfunction Fpass2_edit_Callback(hObject, eventdata, handles)% hObject ? ?handle to Fpass2_edit (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 Fpass2_edit as text% ? ? ? ?str2double(get(hObject,'String')) returns contents of Fpass2_edit as a double% --- Executes during object creation, after setting all properties.function Fpass2_edit_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to Fpass2_edit (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');endfunction Fstop2_edit_Callback(hObject, eventdata, handles)% hObject ? ?handle to Fstop2_edit (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 Fstop2_edit as text% ? ? ? ?str2double(get(hObject,'String')) returns contents of Fstop2_edit as a double% --- Executes during object creation, after setting all properties.function Fstop2_edit_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to Fstop2_edit (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 selection change in filter_type.function filter_type_Callback(hObject, eventdata, handles)% hObject ? ?handle to filter_type (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB% handles ? ?structure with handles and user data (see GUIDATA)global response;val=get(hObject,'Value');switch val ? ?case 1 ? ? ? ?set(handles.type_information,'String','Lowpass'); ? ? ? ?set(handles.Fstop1,'String','Fstop'); ? ? ? ?set(handles.Fpass1,'String','Fpass'); ? ? ? ?set(handles.Fpass2,'Visible','off');%當為低通濾波器時屏蔽Fpass2 Fstop2并把Fstop1 Fpass1設(shè)為Fstop Fpass ? ? ? ?set(handles.Fstop2,'Visible','off'); ? ? ? ?set(handles.Fpass2_edit,'Visible','off'); ? ? ? ?set(handles.Fstop2_edit,'Visible','off'); ? ? ? ?response=1; ? ?case 2 ? ? ? ?set(handles.type_information,'String','Highpass'); ? ? ? ?set(handles.Fstop1,'String','Fstop'); ? ? ? ?set(handles.Fpass1,'String','Fpass'); ? ? ? ?set(handles.Fpass2,'Visible','off');%當為高通濾波器時屏蔽Fpass2 Fstop2并把Fstop1 Fpass1設(shè)為Fstop Fpass ? ? ? ?set(handles.Fstop2,'Visible','off'); ? ? ? ?set(handles.Fpass2_edit,'Visible','off'); ? ? ? ?set(handles.Fstop2_edit,'Visible','off'); ? ? ? ?response=2; ? ?case 3 ? ? ? ?set(handles.type_information,'String','Bandpass'); ? ? ? ?set(handles.Fstop1,'String','Fstop1'); ? ? ? ?set(handles.Fpass1,'String','Fpass1'); ? ? ? ?set(handles.Fpass2,'Visible','on');%當為高通濾波器時屏蔽Fpass2 Fstop2并把Fstop1 Fpass1設(shè)為Fstop Fpass ? ? ? ?set(handles.Fstop2,'Visible','on'); ? ? ? ?set(handles.Fpass2_edit,'Visible','on'); ? ? ? ?set(handles.Fstop2_edit,'Visible','on'); ? ? ? ?response=3; ? ?case 4 ? ? ? ?set(handles.type_information,'String','Bandstop'); ? ? ? ?set(handles.Fstop1,'String','Fstop1'); ? ? ? ?set(handles.Fpass1,'String','Fpass1'); ? ? ? ?set(handles.Fpass2,'Visible','on');%當為高通濾波器時屏蔽Fpass2 Fstop2并把Fstop1 Fpass1設(shè)為Fstop Fpass ? ? ? ?set(handles.Fstop2,'Visible','on'); ? ? ? ?set(handles.Fpass2_edit,'Visible','on'); ? ? ? ?set(handles.Fstop2_edit,'Visible','on'); ? ? ? ?response=4; ? ?otherwise ? ? ? ?set(handles.type_information,'String','Lowpass'); ? ? ? ?set(handles.Fstop1,'String','Fstop'); ? ? ? ?set(handles.Fpass1,'String','Fpass'); ? ? ? ?set(handles.Fpass2,'Visible','off');%當為低通濾波器時屏蔽Fpass2 Fstop2并把Fstop1 Fpass1設(shè)為Fstop Fpass ? ? ? ?set(handles.Fstop2,'Visible','off'); ? ? ? ?set(handles.Fpass2_edit,'Visible','off'); ? ? ? ?set(handles.Fstop2_edit,'Visible','off'); ? ? ? ?response=1;endguidata(hObject, handles);% Hints: contents = cellstr(get(hObject,'String')) returns filter_type contents as cell array% ? ? ? ?contents{get(hObject,'Value')} returns selected item from filter_type% --- Executes during object creation, after setting all properties.function filter_type_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to filter_type (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 selection change in analog_filter.function analog_filter_Callback(hObject, eventdata, handles)% hObject ? ?handle to analog_filter (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB% handles ? ?structure with handles and user data (see GUIDATA)global analog;val_1=get(hObject,'Value');switch val_1 ? ?case 1 ? ? ? ?%set(handles.analog_filter,'String','Butterworth'); ? ? ? ?analog=1;set(handles.function_value,'String','Butterworth');%反饋IIR濾波器設(shè)計所用到的函數(shù) ? ?case 2 ? ? ? ?set(handles.function_value,'String','ChebyshevI'); ? ? ? ?analog=2; ? ?case 3 ? ? ? ?set(handles.function_value,'String','ChebyshevII'); ? ? ? ?analog=3; ? ?otherwise ? ? ? ?set(handles.function_value,'String','Butterworth'); ? ? ? ?analog=1; ? ? ? ?endguidata(hObject, handles);% Hints: contents = cellstr(get(hObject,'String')) returns analog_filter contents as cell array% ? ? ? ?contents{get(hObject,'Value')} returns selected item from analog_filter% --- Executes during object creation, after setting all properties.function analog_filter_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to analog_filter (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 selection change in digital_filter.function digital_filter_Callback(hObject, eventdata, handles)% hObject ? ?handle to digital_filter (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB% handles ? ?structure with handles and user data (see GUIDATA)global digital;val_2=get(hObject,'Value');set(handles.order_information,'String','order');switch val_2 ? ?case 1 ? ? ? ?% set(handles.digital_filter,'String','window'); ? ? ? ?digital=1; set(handles.method_value,'String','window function');%反饋IIR濾波器的方法 ? ? ? ?set(handles.view_window,'Enable','on'); ? ? ? ?set(handles.window_function,'Enable','on'); ? ? ? ?set(handles.specify_order,'Enable','on'); set(handles.specify_order,'Value',0); ? ? ? ? set(handles.custom_order,'Enable','on');set(handles.custom_order,'String',''); ? ? ? ?set(handles.min_order,'Enable','on');set(handles.min_order,'Value',0); ? ? ? ?if(get(handles.FIR_button,'Value')) ? ? ? ?set(handles.order,'Enable','off');end; ? ?case 2 ? ? ? ?% set(handles.digital_filter,'String','frequency response invariance'); ? ? ? ?digital=2; ? set(handles.method_value,'String','FSI'); ? ? ? ?set(handles.view_window,'Enable','off'); ? ? ? ?set(handles.window_function,'Enable','off'); ? ? ? ?set(handles.order,'Enable','on'); ? ? ? ?if(get(handles.FIR_button,'Value')==1) ? ? ? ?set(handles.specify_order,'Enable','off'); ? ? ? ?set(handles.custom_order,'Enable','off'); ? ? ? ?set(handles.min_order,'Enable','off'); ? ? ? ? set(handles.window_function,'Enable','off'); ? ? ? ?set(handles.view_window,'Enable','off'); ? ? ? ?set(handles.order_information,'String','sample'); ? ? ? ?end ? ?otherwise ? ? ? ?% set(handles.digital_filter,'String','window'); ? ? ? ?digital=1;set(handles.method_value,'String','window function');endguidata(hObject, handles);% Hints: contents = cellstr(get(hObject,'String')) returns digital_filter contents as cell array% ? ? ? ?contents{get(hObject,'Value')} returns selected item from digital_filter% --- Executes during object creation, after setting all properties.function digital_filter_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to digital_filter (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 selection change in window_function.function window_function_Callback(hObject, eventdata, handles)global window1;val_4=get(hObject,'Value');switch val_4 ? ?case 1 ? ? ? ?window1=1;set(handles.function_value,'String','Hamming');%反饋函數(shù)信息 ? ?case 2 ? ? ? ?window1=2; set(handles.function_value,'String','Blackman'); ? ?case 3 ? ? ? ?window1=3;set(handles.function_value,'String','Hann'); ? ?case 4 ? ? ? ?window1=4; set(handles.function_value,'String','Rectangular'); ? ?otherwise ? ? ? ?% set(handles.digital_filter,'String','window'); ? ? ? ?window1=1;endguidata(hObject, handles);% hObject ? ?handle to window_function (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB% handles ? ?structure with handles and user data (see GUIDATA)% Hints: contents = cellstr(get(hObject,'String')) returns window_function contents as cell array% ? ? ? ?contents{get(hObject,'Value')} returns selected item from window_function% --- Executes during object creation, after setting all properties.function window_function_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to window_function (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 view_window.function Apass_Callback(hObject, eventdata, handles)% hObject ? ?handle to Apass (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 Apass as text% ? ? ? ?str2double(get(hObject,'String')) returns contents of Apass as a double% --- Executes during object creation, after setting all properties.function Apass_CreateFcn(hObject, eventdata, handles)% hObject ? ?handle to Apass (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');endfunction Astop_Callback(hObject, eventdata, handles)% hObject ? ?handle to Astop (see GCBO)% eventdata ?reserved - to be defined in a future version of MATLAB

3 仿真結(jié)果

4 參考文獻

[1]洪燦梅, 劉愛蓮, 劉名揚,等. FIR濾波器與IIR濾波器去噪效果對比研究[J]. 微型機與應(yīng)用, 2015, 34(21):4.

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