Hi DSP experts,
Can someone please explain to me why it makes sense to calculate group delay using the second equation below. It is under “help grpdelay”
Theory: group delay, g(w) = -d/dw [arg{H(e^jw)}], is the rate of
change of phase with respect to frequency. It can be computed as:
d/dw H(e^-jw)
g(w) = -------------
H(e^-jw)
Also, I could not figure out why d/dw B(e^-jw) = sum(k b_k e^-jwk)
Is a “-j” missing?
Note that,
d/dw B(e^-jw) = sum(k b_k e^-jwk)
d/dw A(e^-jw) = sum(k a_k e^-jwk)
Thanks,
Ntsanderh C. Azenui, PhD