 on DSBSE double sideband with the suppressed carrier. So we will see some examples on the DSBSE. See these are the learning outcomes. At end of this session students will be able to illustrate the examples on DSBSE double sideband suppressed carrier in communication system. See as we know that in DSBSE the carrier is completely suppressed and leaving only USB and LSB at the output here. So due to which the power saving is done here because as we have seen the efficiency of an AM transmitter is just 33% that most of the power to transmit an AM signal is required to transmit a carrier signal which doesn't contain any information here. That's why we are going to completely suppress the carrier signals leaving behind only LSB and USB here. So now just recall that how much bandwidth is required to transmit an DSBSE signal. So it requires just and to FM here okay and how much will be the power required to transmit so that we are going to calculate now here. So we will switch on to the examples now. So now what we have to do in DSBSE is to calculate the power saving by DSBSE for modulating index 100% and 50% means for m equals to 1 and m equals to 0.5 here okay. So these are the two things we have to calculate that is the power saving by DSBSE here. So for that now for the case 1 that is m equals to 1 means that is the 100% okay. So that is the 100% here. So we will have to calculate the total power for the AM signal as well as for the DSBSE signal and then we are going to calculate the total percentage of power by DSBSE. So which will be just the power percentage of used by the DSBSE here and what the question is there to calculate the power saving by DSBSE means what total minus DSBSE. So it will be the total power saving by DSBSE signal will be minus means total minus the power percentage power by the DSBSE here okay. So for AM wave okay so we know that Pt equals to PC 1 plus m square by 2 here. Now substituting m equals to 1 that is PC 1 plus half okay. So which comes to be in 1.5 PC here Pt comes to be in 1.5 PC here okay for AM signal here. Now for DSBSE so we have to calculate Pt so it will be Pt dash here. So here we are going to suppress the carrier signal and we are going to only send LSB and USB at the output here. So the total power will be PC m square by 2 okay. So if you substitute m equals to 1 here so it will be 0.5 square upon 2 so which comes to be in 0.5 PC here okay. So we are substituting the 1 sorry so m equals to 1 here so 1 will be there so it will be Pt dash equals to 0.5 PC here okay. So now we will calculate the percentage power by DSBSE here. So this is not the power saving this is the percentage power by DSBSE which comes to be in Pt dash upon total Pt into 100 here okay. So how much? So it will be 0.5 PC upon 1.5 PC into 100 here okay. So into 100 which gets cancer PC gets cancer here. So after solving this equation you will get 33 percentage here. So percentage power will be 33.33 percentage here okay. So but the question is there how much the power saving by DSBSE. So it will be total minus DSBSE here. So percentage power saving by DSBSE will be 100 minus total that is the power percentage power by DSBSE. So it will be 100 minus 33 percent 33.33 it will be 67.67 percentage here. So this much is the power saving by DSBSE in 67.67 percentage here. So this was there for the case 1 when m equals to 1 here. Now if you solve for m equals to 0.5 here so same wave for am wave so what we have to do for am wave so we have to solve Pt equals to PC 1 plus m square by 2. So substituting the value PC 1 plus 0.5 square upon 2 so which comes to be 1.125 PC. So Pt will be Pt equals to 1.125 PC here okay. So same wave for DSBSE if you solve for that so it will be PC m square by 2 because only two side bands are there. So PC into 0.5 square upon 2 so it will be 0.125 PC. So Pt equals so it will be dash here this will be will be dash that is 0.125 PC here. So if you solve for this that is the percentage power by DSBSE it is an percentage power used okay so it will be Pt dash upon Pt into 100. Substituting these values okay substituting these values that is 1.25 PC and 0.125 PC here so you will get 1.25 PC is equal upon 1.125 PC into 100 so it will be there. So your answer comes to be an 11.11 percentage here. So after solving this so it comes to be an 11.11 here okay. So now total power percentage power saving by DSBSE will be 100 minus 11.11 okay so which comes to be an 88.88 percentage. So for the total power saving will be 88.88 percentage here for m equals to 0.5 and for m equals to 1 it will be 67.67 percentage here okay. So this was the example for DSBSE for calculate the power saving by DSBSE for modulating index 100 percent and 50 percent here. So now so we will revise few points for AM, DSBSE and for SSB because now we have studied all three types of amplitude modulation techniques that is amplitude modulation which is also known as DSBFC that is full carrier and this is the suppressed carrier and this is the SSB. So we will have some parameters for the comparison of the these types of signals okay. So the first parameter is the carrier separation okay. So carrier separation so for in AM so we do not require any carrier separation NN okay. So for DSBSE signal fully means what we are going to fully suppress the carrier signal and for SSB also we are going to suppress fully here okay. And for the sideband separation if you see sideband is not applicable to AM signal so it is not applicable to DSBSE signal. So one sideband is going to be suppressed here for an SSB technique here okay. So now third parameter will be the bandwidth. So how much bandwidth is required to transmit the signal here. So it will be 2 FM same 2 FM and here it will be only FM here okay. Now if you compare for transmission efficiency if you compare transmission efficiency so it is minimum when you compare with DSBSE so it will be moderate and here it will be maximum okay. So when we compare these three signals standard equations of an AM that is AM, DSBSE and SSB here okay. And number of modulating input will be 1, 1, 1. So all will require one modulating signal here okay. And main thing we have to remember that is application. So where the AM signal is used so it is used in radio broadcasting okay. So it is in radio broadcasting same way it is used in radio broadcasting for DSBSE signal and for SSB it is used like in navigation I have told in the video point to point communication so that is also the navigation system okay for the navigation system. If you compare all these parameters that is the carrier SSB separation, bandwidth efficiency and application so we have to compare in this manner here okay. So this was regarding the examples of an DSBSE thank you.