Doubt regarding DSB SC,SSB SC modulation techniques

src2008

@src2008-qrIo4w • Oct 22, 2024

Oct 22, 2024

1.3K

Hello engineers,
I have a very big doubt in DSB SC,SSB SC modulation techniques.we know that the message signal is modulated with a carrier signal of a high frequency for various advantages.my doubt is that in these techniques ,we are suppressing the carrier.what is the need of modulating a signal with a carrier signal and then again suppress it?

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kittu.smiles

@kittusmiles-HePS6F • Mar 3, 2011

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

@src2008-qrIo4w • Mar 3, 2011

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

@praveenkumar-66Ze92 • Mar 3, 2011

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

@chetan-mehra-ZJKbfC • Mar 3, 2011

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

@praveenkumar-66Ze92 • Mar 4, 2011

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

@chetan-mehra-ZJKbfC • Mar 7, 2011

Thanks.......