【滤波器】基于高通+低通+带通+带阻FIR滤波器设计含Matlab源码

1 简介

本文利用kaiser窗​实现了FIR带通数字滤波器的设计,设计结果符合FIR数字滤波器技术指标要求.

2 部分代码

%--------------------------------------------------------------------------%利用kaiser窗设计带通滤波器m文件%默认输入参数：   N=64%                beta=5.568  %                wl=0.2%                wh=0.8%输出参数：      低通带边界（wlh）%               低阻带边界（wls）%               高通带边界（whp）%               高阻带边界（whs）%               通带波纹%               阻带衰减%--------------------------------------------------------------------------function varargout = bpfilter(varargin)% BPFILTER M-file for bpfilter.fig%      BPFILTER, by itself, creates a new BPFILTER or raises the existing%      singleton*.%%      H = BPFILTER returns the handle to a new BPFILTER or the handle to%      the existing singleton*.%%      BPFILTER('CALLBACK',hObject,eventData,handles,...) calls the local%      function named CALLBACK in BPFILTER.M with the given input arguments.%%      BPFILTER('Property','Value',...) creates a new BPFILTER or raises the%      existing singleton*.  Starting from the left, property value pairs are%      applied to the GUI before bpfilter_OpeningFunction gets called.  An%      unrecognized property name or invalid value makes property application%      stop.  All inputs are passed to bpfilter_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 bpfilter​% Last Modified by GUIDE v2.5 29-Jun-2007 13:03:07​% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name',       mfilename, ...                   'gui_Singleton',  gui_Singleton, ...                   'gui_OpeningFcn', @bpfilter_OpeningFcn, ...                   'gui_OutputFcn',  @bpfilter_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 bpfilter is made visible.function bpfilter_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 bpfilter (see VARARGIN)​% Choose default command line output for bpfilterhandles.output = hObject;​% Update handles structureguidata(hObject, handles);​% UIWAIT makes bpfilter wait for user response (see UIRESUME)% uiwait(handles.figure1);%--------------------------------------------------------------------------​​​function edit_beta_Callback(hObject, eventdata, handles)% hObject    handle to edit_beta (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 edit_beta as text%        str2double(get(hObject,'String')) returns contents of edit_beta as a double​​% --- Executes during object creation, after setting all properties.function edit_wl_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_wl (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));end​function edit_wl_Callback(hObject, eventdata, handles)% hObject    handle to edit_wl (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 edit_wl as text%        str2double(get(hObject,'String')) returns contents of edit_wl as a double​​​% --- Executes during object creation, after setting all properties.function edit_wlp_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_wlp (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));end​function edit_wlp_Callback(hObject, eventdata, handles)% hObject    handle to edit_wlp (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 edit_wlp as text%        str2double(get(hObject,'String')) returns contents of edit_wlp as a double​​​​​

3 仿真结果

4 参考文献

[1]王鸿伟. 基于MATLAB的FIR低通滤波器设计[J]. 兰州工业高等专科学校学报, 2007, 14(4):4.

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