Double sideband suppressed carrier AM (DSB-SC AM) is used in the transmission of stereo signals in sound broadcasting using frequency modulation. The transmitted stereo signal is a voltage proportional to L-R, where L and R are the left and right audio signals.
a. A DSB-SC AM waveform is generated by modulating a 38 kHz carrier with a 10 kHz audio sine wave signal. What are the frequencies of the sidebands of the DSB-SC AM signal?
b. Is the 38 kHz carrier present in the DSB-SC AM signal in part (a) above?
c. How is the DSB-SC AM signal demodulated in the radio receiver to recover the L-R signal?
d. How are the left (L) and right (R) signals obtained separately in the radio receiver to drive the dual channel audio amplifier and speakers?
a. The frequencies of the sidebands of DSB-SC AM signal are +/- 10kHz of the carrier signal. So we have 28kHz for lower sideband and 48kHz for the higher sideband.
b. No. As a property of DSB-SC, the carrier is suppressed ...
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