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The unit delay operator can be thought of in the z-domain as ___________

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The unit delay operator can be thought of in the z-domain as ___________

(a) Multiplication by z^-1

(b) Multiplication by z

(c) Multiplication by z^-2

(d) Multiplication by z^2

I got this question during an online interview.

My question comes from Z Transform in portion Digital Signal Processing of MATLAB

1 Answer

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Best answer
Right answer is (a) Multiplication by z^-1

The best explanation: If a signal is delayed by one unit in time, the Z-transform of the resultant signal is the Z-transform of the original signal which gets multiplied by z^-1. Hence, the correct option is Multiplication by z^-1.

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