Plotting frequency response from fdatool filter coefficients?

I created a 400 order bandpass fir filter using fdatool and exported the coefficients. How do I create the frequency response using the coefficients I just made?

Answer 1

[Star Strider]

The easiest way is to use the freqz function to display it. It will also calculate the frequency response and output it as a function of frequency. Use the phasez function for the phase.

[Dick Rusell]

so would it just be if Win was the variable for the coefficients:

Win = coefficients

Hd = freqz(Win, 1, omega);

like that?

[Star Strider]

That would work, with ‘omega’ being a vector of normalised frequencies, giving you the frequency response at those frequencies in ‘Hd’. Note that ‘Hd’ is a complex frequency vector, so you can calculate both amplitude and phase from it.