FIR Filter in MATLAB
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I've seen in MATLAB FIR Filter, that we can use the function 'designfilt', to obtain value from Filter coefficients regarding some specification(cut off frequency, order, etc...). My question is, on the other side, if we already have the filter coefficients, let's say 1x31 coefficients vektor, can we retrieve its specifications(order,cutoff frequency,ripple...)? Maybe using a function in MATLAB,which is i'd like to know.
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Star Strider
on 30 Nov 2016
Use the freqz function to get the transfer function. You would have to calculate the ripple yourself, but that is not difficult. (The findpeaks function would help with that.) The order is the order of the denominator polynomial. You would have to know the sampling frequency to get the cutoff frequency in Hz, although it would again be straightforward to calculate it in radian frequency (on the interval (0,pi)) from the transfer function.
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