Timestamps for the different topics covered in the video: 0:00 Introduction 0:30 Types of Communication: Baseband and Carrier Communication 3:23 Introduction to Double Sideband Suppressed Carrier (DSB-SC) 7:40 Generation of DSB-SC Modulated Signal and Tone Modulation 10:22 Demodulation of DSB-SC
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Thank you for the nice and crisp explanation with optimum time utilisation. Your voice and ascent is clear, no need of caption, actually the caption is a disturbance as it masks vital area of the screen and the diagram/ equations behind. Thank you 🙏
Not sure I will remember all that math, but you certainly made me have a few aha! moments with this. It makes me admire the people that invented this even more.
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Thanks for the great explaination but i have two questions 1- Why we need to multiply the modulated signal with the carrier again at the receiver before the LPF? 2- If the frequency or the phase of the carrier at the receiver is not the same at the transmitter what will happen the the demodulated signal?
Awesome video @:146 you said using modulation the frequency spectra of the BBU signal is shifted to non-overlapping band at the higher frequency is this using FM you mean? or the modulation in general regardless of the type it will do the shifting?
Hi, kindly thank you very much for your lectures. You were saying there is no discrete component at the centred frequencies (-fo and fo). However, what if we have DC component in our signal that appears at 0 Hz. Then, would not we have a component at centres?
Thanks for the great video,sir. But I have a doubt in demodulation where you've used LPF. So, it will allow 1/4(M(f-2f0).but, we dont need that signal right,sir. Are we suppose to use BPF instead of LPF, sir?
The LPF will in fact reject 1/4 M (f - 2fo) and will pass only the message signal spectrum. Please check at 12:22. Because after the demodulation, we want to recover the original message signal. I hope, it will clear your doubt.
You said at 07:30 : now, one thing if you notice over here, then at every zéro crossings of this message signal, there will be a phase reversal in the modulated signal. And that is wrong and big mistake for ‘phase-reversal’, to occur, both the message and the carrier should have their zero-crossings at the same instant of time. In the event of the zero-crossing of the message not being accompanied by the zero-crossing of the carrier, there is a change in polarity of the modulated waveform without the usual ‘phase-reversal’
Sir , if am being confused. Please help me. Sir , if in AM only the amplitude of the carrier wave is modulated according to the message signal , then what does the upper and lower side bands represent? Is this means that the frequency of carrier also changes or what?
In time domain, yes only amplitude of carrier wave is modulated but the same thing in frequency domain corresponds to two side bands around carrier frequency. (Of course, in DSB-SC, we will not have carrier frequency ). The carrier signal frequency is not changing but the message signal band gets shifted by fc in frequency domain. I hope, it will clear your doubt.
Please clarify my doubt. The message signal during transmission is m(t). But in 12.25 you mentioned that the msg signal is 1/2(m(t)).why ? Dividing it by 2, won't it get disturbed ?
When the message signal m(t) is divided by 2, only its amplitude will become half. In every other aspect the signal is same. After recovering the message signal, using simple amplifier its amplitude can be doubled or scaled as per the requirement. I hope it will clear your doubt.
I don't understand the forier transform of Cos in Tone Modulation part... how there is term 1/2 ? I saw in books Fourier transform of coswot = F{Coswot} = π[d(w+wo) +d(w-wo)} ? which one is correct?
The formula which you have written is in w (angular frequency). If you see the formula of Fourier transform in terms of the angular frequency, then in the frequency shifting property there is 2*pi additional term. Therefore the overall expression will get multiplied with 2*Pi. The expression written in the video is in frequency. e.g (f- fo) Both are correct representations. I hope it will clear your doubt.
Why is it that when I come looking for electronics information, it's almost always by an Indian?? Your English isn't very good Turd? You mean third. Stop pausing in the middle of a sentence. When you do that, it makes the sentence confusing.
