 on SSB SC that is modulation by filter method in communication system. So, these are the learning outcomes at end of this session students will be able to explain single side band modulation in electronic communication system. So, we will have the overview of an the single side band modulation which is also known as an SSB technique here ok. So, this is one form of an amplitude modulation only ok. So, where the carrier is completely suppressed with one of its side band that is lower or upper side band here. As we know that the information carried in side bands will be same in lower and upper side band ok. So, in some applications we do not require that much accuracy of sending the signal here. So, at that time we may use the single side band modulation where the carrier is going to be suppressed and one of its side band here ok. So, what are the advantages of using this SSB? Since due to the separation of an carrier and one of its side band here the power is saved and the reduces the transmission bandwidth by half that of an AM and DSB SC system here. As we know that the bandwidth required to transmit an AM signal is how much is 2 FM ok. The same thing is required for an DSB SC here, but in single side band it comes to be in half of that means we require only FM of bandwidth here ok. So, we will see the different types of techniques in single side band modulations. There are three types of modulation techniques that is the filter method, phase shift method and the third method is there. So, in this video we will completely define what is the filter method, how the single side band modulation is being generated here ok. So, now we will switch over to the demo. So, before starting to the filter method for the generation of an SSB technique here. So, currently we will see how much power is required to transmit an AM signal here. So, in AM signal total power was PC plus PLSB PUSB here. So, this was the total power required for that, but we have seen that two-third of power is required to transmit an carrier signal and only less amount of power is required to transmit an information signal here. That is why we are going to suppress the carrier signal in DSB SC. So, in DSB SC, so total power will be only PLSB plus PUSB here. So, we are going to save the power, but in total power in SSB is just PLSB or PUSB which side bands we are going to use to transmit the signal here. So, if you see here, so the power required will be m square by 4 into PC here ok. So, maximum power will be when m equals to 1 here, if you substitute m in equals to 1 in this equation. So, 1 by fourth of PC means 25 percent of the total power of the PC will be required to transmit an SSB. So, we have saved the power saving is much in SSB and bandwidth. So, if you want to calculate bandwidth, it will be only an FM here. We have said the half of the bandwidth which is required to transmit an the signal DSB SC and total signal that is an AM signal here ok. So, now there are three methods are there to generate for two generation of an SSB. So, first is the filter method, second one is the phase shift method, third one is third method. So, in this lecture we will focus on the filter methods here ok. So, for that we required one block diagram. So, we will see the first the block diagram for the filter method here ok. So, filter method as we know that SSB is a technique means we have to generate and one side band here. So, before start, so it will be balanced modulator that is BM ok. So, balanced modulator will be there. So, after that filter will be there and after that you required one balance mixer. So, we will see that why balance mixer is required here and crystal oscillator output ok. So, now for modulation, so you required one modulating signal and one carrier signal ok. So, you required one carrier signal here. So, now suppose this is X of t ok and this is omega c here. So, this is an input signal the X of t and omega c. So, in balance modulator you know that so the output of this balanced modulator will be LSB or USB by suppressing the carrier signal here. So, one of its side band. So, it will be omega c plus omega m or omega c minus omega m here. So, this will be the DSB SC signal here. So, DSB SC signal here. Now, if you are going to pass this through an filter here. So, you know that what is the meaning of an filter. The filter is nothing but to remove the unwanted frequencies from the input here that is known as an filter here. So, there are various types of filters used in electronic communication system such as low pass filter, high pass filter, band pass filter, band stop filter, band reject filter here ok. So, here we are going to make use of an band pass filter ok. So, which should have which should have high Q that is quality factor while designing the filters you should have this factor that is high Q flat pass band high selectivity means only those signals should be selected and send forward here. So, these are the properties of an filter it should have high Q flat pass band and high selectivity ok. So, this filter is also known as an SSB filter because it is used in SSB generation technique here. So, that is why it is known as an SSB filter here. So, whenever you are going to pass through this. So, if you are going to make use of an USB filter. So, the output will be that is omega c plus omega m means only USB will be an output. So, this is the SSB generation only one sideband is being passed because you are going to make use of an USB filter here and you are going to have only one output and you are going to suppress this low sideband here ok. So, after doing this. So, there is one more block that is balanced mixer and crystal oscillator ok. So, now if you see the input. So, the input is nothing but that is modulating signal as well as the carrier signal is there. So, what will happen? So, your output frequency is same as an input frequency, but we cannot transmit such type of signal directly in the channel here. So, that is why we have to convert that frequency ok. So, we have to boost that frequency boost frequency which is there at the output of filter here that is known as an up conversion of frequency. The boosting of that frequency is nothing but it is known as an up conversion here that is done in the balance mixer here. This is an crystal oscillator to increase the frequency ok. Then we are going to send as an output to the transmitter at the output transmitter here ok. Now, which type of filters can be used in this are there are three types of filters are there that is LC filter, mechanical filters and there is a crystal filters are there here. So, the LC filters it suppose the maximum frequency of 100 kilohertz ok, mechanical filters it suppose 500 kilohertz of frequencies and crystal oscillator which suppose 20 megahertz of frequencies here ok. So, this of filters are used here. So, where the applications of an SSBs are used. So, they are used in the navigation system that is the satellite communication ok. Most of the time the SSB techniques are used there here. So, we will revise once again for the filter method. So, the name as a name suggests here. So, we are going to make use of an filter here ok. So, first we have to suppress the carrier signal. So, that is why we are going to make use of an balance modulator that is the modulating signal as well as the carrier signal and filter at this output will be DSBSA signal which is pass through and filter here the band pass filter is used for the SSB generation. So, the factors which should filter have the high Q that is quality factors flat pass band high selectivity. So, after passing through and filter you will get an USB signal here because I have used the high pass filter like this for example. So, you will get an SSB output here. So, the output what is the frequency of an output of the filter is same as like an input. So, we cannot directly transmit those frequency. So, we have to boost that frequency that boosting of frequency is nothing, but it is known as an up conversion. So, this up conversion is done using a balance mixer and the crystal oscillator here and it is being transmitted here. And these are the filters used in this method that is LC filters, mechanical filters and crystal filters here. Thank you.