I'm new to SigmaStudio and I'm trying to implement the following algorithm (comb filter). I have no problems with y(n) = x(n) – x(n - Nf) but when I try to add the 'alpha' term I get an error 'illegal feedback'. Sampling frequency is 48k and Nf is 800. Alpha must be less than 1.
y(n) = x(n) – x(n - Nf) + alpha*y(n – Nf)
Any input would be appreciated.