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-II realization of that IIR filter?(a) M+N+1(b) M+N(c) Min [M,N](d) Max [M,N]This question was posed to me during a job interview.My doubt stems from Structures for IIR Systems in division 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-II realization of that IIR filter?(a) M+N+1(b) M+N(c) Min [M,N](d) Max [M,N]This question was posed to me during a job interview.My doubt stems from Structures for IIR Systems in division Discrete Time Systems Implementation of Digital Signal Processing
Answer» Right option is (d) MAX [M,N] For EXPLANATION I would say: From the direct form-II realization of the IIR filter, if M and N are the orders of NUMERATOR and denominator of rational system function RESPECTIVELY, then Max[M,N] memory locations are required.

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