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Explain Amplitude modulation and AM Band width. Give a few advantages of AM. |
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Answer» Solution :Amplitude modulation. In amplitude modulation, the amplitude of the carrier wave is varied in accordance with the modulating SIGNAL, while frequency of the carrier wave remains constant. Band width It is clear from the figure that modulated signal lies in frequency range from `omega_(c)-omega_(m)` to `omega_(c)+omega_(m)i.e.,2omega_(N)` the band width of the transmitted signal. `:.` Band width `=2xx` Frequency of audio signal. If an audio signal has frequency ranging from `omega_(1)` to `omega_(2),` then each frequency in audio signal PRODUCES a pair of side bands on modulation. Entire signal produces two side bands symmctrically disposed about carrier waves as shown in figure.  Advantages of AM `1.` The channel width of AM is much less `((1)/(10)th)` the channel width required for FM. `2`. Reception of AM is not limited to line of sight like FM. `3`. The equipment required for transmission and reception of AM is more simple than for FM. |
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