1.

Signal and its Hilbert transform have________(a) same energy density spectrum(b) same power(c) a phase difference of 60°(d) a phase difference of 120°I got this question in an internship interview.The query is from Coherent Detection of DSBSC Waves topic in portion Double Sideband Suppressed Carrier Modulation of Analog Communications

Answer»

Right option is (a) same ENERGY density spectrum

Best explanation: PROPERTIES of Hilbert TRANSFORM states that the signal and its Hilbert transform :

i) have same energy density spectrum

ii) are MUTUALLY orthogonal

iii) have same auto correlation function

iv) have same magnitude

v) have a PHASE difference of “-90” degree.



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