In: Electrical Engineering
For each of the baseband signals: (i) ?(?) = cos 1000?; (ii) ?(?) = 2 cos 1000? + cos 2000?
(a) Sketch the spectrum of m(t).
(b) Sketch the spectrum of the DSB-SC signal ?(?) cos 10000?.
(c) Identify the upper sideband (USB) and the lower sideband (LSB) spectra.
(d) Identify the frequencies in the baseband, and the corresponding frequencies in the DSB-SC, USB, and LSB spectra. Explain the nature of frequency shifting in each case.