If M and N are the orders of numerator and denominator of rational system function respectively, then how many memory locations are required in direct form-I realization of that IIR filter?(a) M+N+1(b) M+N(c) M+N-1(d) M+N-2I have been asked this question during an internship interview.This interesting question is from Structures for IIR Systems topic in section Discrete Time Systems Implementation of Digital Signal Processing

If M and N are the orders of numerator and denominator of rational sys

1.	If M and N are the orders of numerator and denominator of rational system function respectively, then how many memory locations are required in direct form-I realization of that IIR filter?(a) M+N+1(b) M+N(c) M+N-1(d) M+N-2I have been asked this question during an internship interview.This interesting question is from Structures for IIR Systems topic in section Discrete Time Systems Implementation of Digital Signal Processing
Answer» The CORRECT option is (a) M+N+1 Best EXPLANATION: From the DIRECT form-I realization of the IIR FILTER, if M and N are the orders of NUMERATOR and denominator of rational system function respectively, then M+N+1 memory locations are required.

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