What is the spectrum that is obtained when we plot |ck| as a function of frequency?(a) Magnitude voltage spectrum(b) Phase spectrum(c) Power spectrum(d) None of the mentionedThis question was addressed to me during a job interview.I need to ask this question from Frequency Analysis of Continuous Time Signal topic in chapter Frequency Analysis of Signals and Systems of Digital Signal Processing

What is the spectrum that is obtained when we plot |ck| as a function

1.	What is the spectrum that is obtained when we plot \|ck\| as a function of frequency?(a) Magnitude voltage spectrum(b) Phase spectrum(c) Power spectrum(d) None of the mentionedThis question was addressed to me during a job interview.I need to ask this question from Frequency Analysis of Continuous Time Signal topic in chapter Frequency Analysis of Signals and Systems of Digital Signal Processing
Answer» The correct CHOICE is (a) Magnitude voltage spectrum The explanation: We know that, Fourier SERIES coefficients are complex valued, so we can REPRESENT ck in the following way. ck=\|ck\|e^jθk When we plot \|ck\| as a function of frequency, the spectrum thus OBTAINED is KNOWN as Magnitude voltage spectrum.

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