Question

If the output of the system of the system at any ‘n’ depends only the present or the past values of the inputs then the system is said to be __________

(a) Linear

(b) Non-Linear

(c) Causal

(d) Non-causal

The question was asked in quiz.

The origin of the question is Discrete Time Systems in portion Discrete Time Signals and Systems of Digital Signal Processing

Answer 1

The correct option is (c) Causal

To elaborate: A system is said to be causal if the output of the system is defined as the function shown below

y(n)=F[x(n),x(n-1),x(n-2),…]

So, according to the conditions given in the question, the system is a causal system.