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 EDIT
gui_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 bpfilter
handles.output = hObject;
% Update handles structure
guidata(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.

博主简介：擅长智能优化算法、神经网络预测、信号处理、元胞自动机、图像处理、路径规划、无人机等多种领域的Matlab仿真，相关matlab代码问题可私信交流。

部分理论引用网络文献，若有侵权联系博主删除。