Q. Signum function sgn(f), for f>0, f=0 and f<0, has the values:- Published on 15 Oct 15a. -1 to +1
b. +1, 0, -1 respectively
c. -∞ to + ∞
d. 0 always
ANSWER: +1, 0, -1 respectively
The sgn(f) is a signum function that is defined in the frequency domain as
sgn(f) = 1, f> 0
= 0, f = 0
= -1, f< 0
Mathematically, the sign function or signum function is an odd mathematical function which extracts the sign of a real number and is often represented as sgn.
