>ftzufo=3;                                       
>stuetzpkte=72;                                  
>                                                
>function fract(x)                               
$return 1+x-round(x+0.5,0)                       
$endfunction                                     
>                                                
>function inint(t)                               
$useglobal                                       
$return round(fract(t)*stuetzpkte,0)/stuetzpkte  
$endfunction                                     
>                                                
>function sinint(t)                              
$useglobal                                       
$return sin((inint(t))*2*pi)                     
$endfunction                                     
>                                                
>t=[0:1727]/864;f=sinint(t);xplot(t,f);          
>c=fft(f); p=20*log(abs(c)/864);                 
>xplot((0:863)/2,p(1:864));xgrid([1,72]);   
>                                           
>stuetzpkte=72;ftzufs=3;ftres=256;                                            
>                                                                            
>function inint(t)                                                           
$useglobal                                                                   
$return mod(round(t/(ftzufs*ftres),0),stuetzpkte)/stuetzpkte                 
$endfunction                                                                 
>                                                                            
>function sinint(t)                                                          
$useglobal                                                                   
$return sin((inint(t))*2*pi)                                                 
$endfunction                                                                 
>                                                                            
>t=[0:432]/2*ftres;f=sinint(t);xplot(t*20e-3/(ftres*stuetzpkte*ftzufs),f);   
>                                                                            
>t=[0:110592];f=sinint(t);xplot(t,f);                                        
>c=fft(f); p=20*log(abs(c)/55296);                                           
>xplot((0:4095)/144,p(2:4097));ygrid(-0.01);