Multiple Choice Questions on DT systems

1. Multiple Choice Questions on DT
systems
Dr.K.G.SHANTHI
Professor/ECE
R.M.K College of Engineering
and Technology

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Delay Element
Multiplier
Adder

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Delay Element
Ans: y(n-1)

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][][][][][ nhnxknhkxny
k
 



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a) u(n-1)-u(n-2)
b) u(n-2)-u(n-1)
c) u(n)-u(n-1)
b) u(n-2)-u(n-1)

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1.
2.

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Y(Z)-1/2 Z^(-1) Y(Z)+1/4Z^(-2) Y(Z)=X(Z)
Y(Z)(1- 1/2 Z^(-1)+1/4Z^(-2))= X(Z)
H(Z)=Y(Z)/X(z)=1/ (1- 1/2 Z^(-1)+1/4Z^(-2)

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Direct form-II Direct form-I

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The signal is left sided sequence. |z|<5,It includes the unit circle and hence the system is stable.

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THANK YOU ALL