AM (DSB+C): Modulation and Demodulation Overview
Modulation is a crucial process that shifts frequencies in a signal, involving a message signal and a carrier signal. Demodulation, on the other hand, revolves around recovering the baseband message signal from the modulated signal. This detailed content explores the Fourier transforms of modulated and demodulated signals, along with the process of DSB modulation and demodulation. Discover the challenges of DSB-SC modulation and the alternative in AM (DSB+C) modulation. Dive into the world of amplitude modulation and its significance.
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Presentation Transcript
AM(DSB+C) Modulation & Demodulation
Modulation Modulation is a process that causes a shift in the range of frequencies in a signal. The original signal that generated from input transducer which actually we want to sent through transmitter is called Message Signal or modulating Signal or Baseband Signal. The High Frequency Sinusoidal Signal Which is used to shift the frequency of message signal is called carrier signal.
Fig. Baseband Message Signal Fig. Modulated Signal
Demodulation The process of recovering the baseband message signal from the modulated signal is referred to as demodulation or detection. Or Retranslating the spectrum to its original position
Fourier Transform of Demodulated Signal Fig. Demodulated Signal Spectrum
Fig. Message Signal Fig. Modulated Signal Fig. Demodulated Signal
DSB Modulator & Demodulator Transmitter Receiver
Amplitude Modulation (AM) Problem with DSB-SC Modulation : Alternative of DSB-SC :
AM (DSB+C) Alternative of DSB-SC = AM Alternative of DSB-SC = AM
Derive the modulated signal for a single tone message signal and also derive the power equations. Let And, Carrier Signal,?(?) =??cos (2????) Where, Am=Message Signal Amplitude Ac=Carrier Signal Amplitude Message Signal,?(?) =??cos (2????) = ??cos (2????) Modulation Index, =?? ??
?( ?) =??cos (2????) And, ? (?) =??cos (2????)
