Plot a bode plot
I think I sort out understand your explainsion, because the highest frequency in the signal is 8kHz, this is why my sampling frequency is 16kHz, therefore the last point corresponding the highest (last) frequency component in my signal, and because my sampling frequency is 16kHz, and I have 128 points, so resolution is 125Hz. Am I explaining correctly?
I now have 3questions wanna ask you experts, as in this case, I have to use a filter to suppress the tonal interference, I used FIR1 but have no idea for the following terms:
1. What is tonal interference?
2.what is normalized frequency? How to calculate it?
3.When I use filter function in Matlab, how should I determine the order parameter please?