Electronics and Communication Engineering - Signals and Systems - Discussion


Which one most appropriate dynamic system?

[A]. y(n) + y(n - 1) + y(n + 1)
[B]. y(n) + y(n - 1)
[C]. y(n) = x(n)
[D]. y(n) + y(n - 1) + y(n + 3) = 0

Answer: Option A


Because present output of y(n) depend upon past y(n - 1) and future y(n + 1).

Sara said: (Aug 5, 2014)  
Why option D can't be the answer?

Khalique said: (Jun 18, 2015)  
Only option D represents system option A does not represent any system. Hence D must be the correct choice.

Dhava Perumal said: (Jun 19, 2015)  
Yes @Mr. Khalique is absolutely correct.

Because the system equation must represent some response. So in option D, the response is given but not in A.

Harry said: (Sep 19, 2015)  
Sir, in this question objects are wrong please creation y(n) = y(n-1)+y(n+1).

Nag. said: (Oct 10, 2015)  
Sir system output does not depends on depends on future I think there is no correct answer.

Swathipriya said: (Oct 14, 2015)  
If option A is correct then option D also should be correct. Whoever the author of the question explain with correct answer.

Y Sarma said: (Jun 30, 2016)  
I think A and D both are correct.

If it's true then we have to choose A as an answer because of priority of order.

Harini said: (Aug 30, 2016)  
The dynamic system depends only on past outputs or past inputs and not on future outputs, Hence option A and D can't be correct and option C is a static system. So option B may be the right answer.

Lasya said: (Sep 10, 2016)  
Please tell me which is the correct answer?

Rangu said: (Feb 26, 2017)  
Dynamic system depends on past Input and past output.

Lucky said: (Mar 13, 2017)  
Dynamic system depends upon the past and future input and outputs. So in my view, option A and D are the correct answers.

Sridevi said: (Apr 29, 2017)  
Please, tell me the correct answer with the explanation.

Mohit said: (Jun 2, 2017)  
The Dynamic system depends on present and past i/p o/p. So option b is correct.

Ranbir said: (Oct 10, 2017)  
Option A and D is correct because both past and future value depends, and the option A has more correct than D due to order.

Chiku said: (Oct 21, 2017)  
Option A& D both are correct because both system satisfied condition of dynamic.

Apurva said: (Oct 29, 2017)  
In Dynamic systems, output depends on present input as well as past or future inputs.

Nnkundan said: (Nov 18, 2017)  
Both A and D is correct. But in above question there is a statement given that "one most appropriate". Now option "a" is more appropriate bcoz y(n) + y(n - 1) + y(n + 1) bcoz this dynamic system contains value of +-1 at the same time. If option "D" is given like y(n) + y(n - 3) + y(n + 3) then there is confusion between A and D. But here there is no confusion.

Swami said: (Jan 25, 2018)  
How system depends on future output? it is unrealizable and option B is correct.

Vimala said: (Jun 20, 2018)  
Option D is correct because A is not a system.

Joshi said: (Aug 30, 2018)  
As option A does not have the proper form of expression, so D must be the correct option.

Vani said: (Oct 13, 2018)  
Option A doesn't even show the equation of a system, hence option D is the more appropriate answer.

Lavanya said: (Mar 15, 2019)  
I think option B is correct.

Devesh Drishti said: (Mar 6, 2020)  
Options A and D both are correct.

The dynamic system means having a memory which is represented by past and future o/p
At given present i/p.

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