Plotting frequency response from fdatool filter coefficients?

2014 10 18
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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?

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Star Strider
Star Strider 2014-10-18
编辑：Star Strider 2014-10-18

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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.

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Dick Rusell
Dick Rusell 2014-10-18
so would it just be if Win was the variable for the coefficients:
Win = coefficients
Hd = freqz(Win, 1, omega);
like that?
Star Strider
Star Strider 2014-10-18
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.

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