Reason for introducing phase shifts in amplitude & phase spectra

Q.  Why are the negative & positive phase shifts introduced for positive & negative frequencies respectively in amplitude and phase spectra?
- Published on 30 Nov 15

a. To change the symmetry of the phase spectrum
b. To maintain the symmetry of the phase spectrum
c. Both a & b
d. None of the above

ANSWER: To maintain the symmetry of the phase spectrum

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