% signalgui:This Gui shows the main concepts of 'Signals and Systems'
figure('position',[100 100 600 400],'name','信號與系統教學演示系統');
p1_string = {'1.基本信號的表示'
             '2.序列的運算'
             '3.連續時間信號的卷積與相關'
             '4.信號的回聲及消除'
             '5.采樣頻率對頻譜的影響'
             '6.采樣信號的重建'
             '7.DTFM信號及其頻譜'
             '8.DTFM信號的檢測'
             '9.離散時間信號的卷積與相關'
             '10.音樂合成'
             '11.系統的頻率響應特性'
             '12.傅里葉級數'
             '13.傅里葉變換的性質'
             '14.信號的合成'
             '15.滑動平均濾波器'
         };
run1_m={
        'simple_signal',
        'sig_operate',
        'ctcongui',
        'echodemo',
        'sam_frequency',
        'sam_inverse',
        'phone',
        'dtmftest',
        'dtcongui',
        'syn_music',
        'cltidemo',
        'fsgui',
        'ftprpgui'
        'fssyngui'
        'mafilterdemo'
    };
p1=uicontrol('style','popupmenu',...
        'position',[50 350 250 20],...
        'string',p1_string);
p2=uicontrol('style','listbox',...
        'position',[320 50 260 320],...
        'FontWeight','demi');
Hc_close=uicontrol(gcf,'style','push',...
        'position',[200 120 100 25],...        
        'string','Close',...                
        'Callback','Close'); 
Hc_run=uicontrol(gcf,'style','push',...
        'position',[50 120 100 25],...        
        'string','Run',...                
        'Callback',['num=get(p1,''value'');','eval(run1_m{num})']); 
set(p1,'Callback','signalgui_doc');