Doubt regarding DSB SC,SSB SC modulation techniques

Replies

• 

  kittu.smiles

  Amplitude modulation produces a modulated output signal that has twice the bandwidth of the original baseband signal. Single-sideband modulation avoids this bandwidth doubling, and the power wasted on a carrier. And the same concept appilies to DSB-SC
• 

  src2008

  Hello CE,
  I think u did not get my doubt.we are modulating baseband signal with a carrier signal and then again suppressing the carrier using DSB SC,SSB SC methods.my doubt is what is the need of modulating a baseband signal with a carrier signal and then again suppress the same carrier signal using DSB SC ,SSB SC?
• 

  PraveenKumar Purushothaman

  src2008

  Hello CE,
  I think u did not get my doubt.we are modulating baseband signal with a carrier signal and then again suppressing the carrier using DSB SC,SSB SC methods.my doubt is what is the need of modulating a baseband signal with a carrier signal and then again suppress the same carrier signal using DSB SC ,SSB SC?

  If you need to suppress the signal, it must be pre-modulated in order to proceed. Will get more information soon.
• 

  chetan mehra

  See as you know that when we want to reconstruct our message signal at the receiver end.Therfore we require a synchronous oscillator having frequency equal to the message frequency,but this is not possible to synchroniose the oscillator with the carrier frequency,in fact phase errors are also introduces in the oscillator which creates a DONALD DUCK like voice effect in the reconstructed signal at the output..
  now moving to your question,as you know that the carrier component does not bears the information,therefore for effecient transmission we suppress it or attenuate it by some means.now at the receiver site we filter this component from the modulated signal,amplify it by some means and afterwards by cohernt detection technique we accurately reconstruct our message signal..
  I think this will help you out...😒
  thats why these two methods DSB-SC and SSB-SC are always preferred than AM..infact SSB-SC is very efficient for audio transmission because there one of the side band is transmitted and the other one is suppressed..
• 

  PraveenKumar Purushothaman

  chetan mehra

  See as you know that when we want to reconstruct our message signal at the receiver end.Therfore we require a synchronous oscillator having frequency equal to the message frequency,but this is not possible to synchroniose the oscillator with the carrier frequency,in fact phase errors are also introduces in the oscillator which creates a DONALD DUCK like voice effect in the reconstructed signal at the output..
  now moving to your question,as you know that the carrier component does not bears the information,therefore for effecient transmission we suppress it or attenuate it by some means.now at the receiver site we filter this component from the modulated signal,amplify it by some means and afterwards by cohernt detection technique we accurately reconstruct our message signal..
  I think this will help you out...😒
  thats why these two methods DSB-SC and SSB-SC are always preferred than AM..infact SSB-SC is very efficient for audio transmission because there one of the side band is transmitted and the other one is suppressed..

  Dude! Awesome reply!!! 😀
• 

  chetan mehra

  Thanks.......