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A signum function is—
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- zero for t greater than zero
- zero for t less than zero
- unity for t greater than zero
- 2 u(t) – 1
Correct Option: D
Signum function may be defined as
and step unit step function is defined as
and step unit step function is defined as
From fig. (A) and fig. (B), we conclude that
sgn(t)=2u(t) – 1
Hence, alternative (D) is correct choice.
