基于matlab的iir数字滤波器gui界面设计代码

下面是一个简单的基于MATLAB的IIR数字滤波器GUI界面设计代码，你可以根据自己的需求进行修改和扩展。

function iir_filter_gui
% 创建主窗口
main_window = figure('Name','IIR数字滤波器','NumberTitle','off','Position',[200,200,300,250],'MenuBar','none','ToolBar','none');

% 创建选择滤波类型的文本和下拉菜单
uicontrol('Parent',main_window,'Style','text','String','选择滤波类型:','Position',[20,200,100,20]);
filter_type_menu = uicontrol('Parent',main_window,'Style','popupmenu','String',{'低通滤波器','高通滤波器','带通滤波器','带阻滤波器'},'Position',[130,200,120,20]);

% 创建选择滤波器阶数的文本和滑动条
uicontrol('Parent',main_window,'Style','text','String','选择滤波器阶数:','Position',[20,170,100,20]);
order_slider = uicontrol('Parent',main_window,'Style','slider','Min',1,'Max',10,'Value',5,'SliderStep',[1/9,1/9],'Position',[130,170,120,20]);

% 创建显示当前滤波器阶数的文本
order_text = uicontrol('Parent',main_window,'Style','text','String','5','Position',[260,170,30,20]);

% 创建选择滤波器截止频率的文本和滑动条
uicontrol('Parent',main_window,'Style','text','String','选择截止频率:','Position',[20,140,100,20]);
cutoff_slider = uicontrol('Parent',main_window,'Style','slider','Min',0,'Max',1,'Value',0.5,'SliderStep',[0.01,0.1],'Position',[130,140,120,20]);

% 创建显示当前截止频率的文本
cutoff_text = uicontrol('Parent',main_window,'Style','text','String','0.5','Position',[260,140,30,20]);

% 创建滤波器设计按钮
design_button = uicontrol('Parent',main_window,'Style','pushbutton','String','设计滤波器','Position',[100,100,100,30],'Callback',@design_filter);

% 创建显示滤波器响应的轴
response_axes = axes('Parent',main_window,'Position',[0.1,0.1,0.8,0.4]);

% 回调函数，用于设计滤波器并绘制其响应
function design_filter(~,~)
    % 获取用户选择的滤波器类型、阶数和截止频率
    filter_type = filter_type_menu.Value;
    order = round(order_slider.Value);
    cutoff = cutoff_slider.Value;
    
    % 根据用户选择的滤波器类型创建滤波器对象
    switch filter_type
        case 1
            filter_object = designfilt('lowpassiir','FilterOrder',order,'PassbandFrequency',cutoff);
        case 2
            filter_object = designfilt('highpassiir','FilterOrder',order,'PassbandFrequency',cutoff);
        case 3
            filter_object = designfilt('bandpassiir','FilterOrder',order,'PassbandFrequency1',cutoff-0.1,'PassbandFrequency2',cutoff+0.1);
        case 4
            filter_object = designfilt('bandstopiir','FilterOrder',order,'PassbandFrequency1',cutoff-0.1,'PassbandFrequency2',cutoff+0.1);
    end
    
    % 获取滤波器响应
    [h, w] = freqz(filter_object);
    
    % 绘制滤波器响应曲线
    plot(response_axes,w/pi,20*log10(abs(h)));
    xlabel(response_axes,'归一化频率');
    ylabel(response_axes,'增益(dB)');
    title(response_axes,'IIR数字滤波器响应');
end

% 回调函数，用于更新滤波器阶数显示文本
function update_order_text(~,~)
    order_text.String = num2str(round(order_slider.Value));
end

% 回调函数，用于更新截止频率显示文本
function update_cutoff_text(~,~)
    cutoff_text.String = num2str(cutoff_slider.Value);
end

% 为阶数滑动条和截止频率滑动条添加回调函数
addlistener(order_slider,'Value','PostSet',@update_order_text);
addlistener(cutoff_slider,'Value','PostSet',@update_cutoff_text);

end

运行该代码后，会弹出一个窗口，你可以选择滤波器类型、滤波器阶数和截止频率，点击“设计滤波器”按钮后，程序会根据你的选择设计滤波器并在窗口中绘制出其响应曲线。