L $begingroup$ In data and psychological exploration, what is denoted by capital $N$ vs lowercase $n$? What we do to develop the polyphase decimator is layout the small pass FIR filter as wanted for the normal method, and afterwards map that filter from row to columns in the decimator construction https://www.tumblr.com/pginsector15gurugram/790285487683305472/book-modern-pg-for-boys-in-gurgaon-osmstays?source=share