hello everyone,

i want to filter 50 Hz sinus and therefore i implemented a notch filter such as shown in the help. i don'w know why it doesn't work. does everyone have a clue ? see also the attached file 'debuging' this is the program :

`if true % code`

end*t=0:0.0005:0.5; % fs=2000Hz

x=sin(2*pi*50*t)+sin(2*pi*70*t);figure;plot(t,x);title('Sum of sinuses - of 50Hz & of 70Hz ');% implementation of the notch filter

wo = 50/(2000/2); bw = wo/35;[b,a] = iirnotch(wo,bw);fvtool(b,a);%signal after filterization

figure;g=filter(b,a,x);plot(t,g);title('The signal after removing its 50 Hz sinus');%figure of 70 Hz for comarison to what i need to get

figure;y=sin(2*pi*70*t);plot(t,y);title('A 70 Hz sinus - for comparison');*

thanks a lot

## Best Answer