Introduction to Amplitude Modulation | Double Side Band Suppressed (DSB-SC) Carrier Explained

In this video, the Double Side Band Suppressed Carrier Modulation is explained in detail.

By watching this video, you will learn the following topics:

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

Types of Communication:

1) Baseband Communication
2) Carrier Communication

In Baseband Communication, the message signal is transmitted without any modification. The term baseband signal is used for the original message signal generated from the source.
Telephony is an example of baseband communication.

Carrier Communication:

The communication which uses the modulation to shift the frequency spectra of the message signal is known as the carrier communication.
So, for the frequency shifting, the high-frequency carrier signal is used. The carrier signal does not carry information but helps in carrying the message signal. It acts as an envelope. In carrier modulation, any three of the basic properties of the carrier like the amplitude, frequency, or the phase is changed according to the message or the baseband signal.

Amplitude Modulation:
In amplitude modulation, the amplitude of the carrier signal is changed according to the message signal.
Depending on the frequency spectra of the modulated signal, the Amplitude Modulation can be classified into four categories.

1) Double Side Band Suppressed Carrier (DSB-SC)
2) Double Side Band with Carrier (AM )
3) Single Side Band Modulation (SSB)
4) Vestigial Side Band Modulation (VSB)

In this video, the DSB-SC is explained and its modulation and demodulation process is explained.

In DSB-SC modulation, the bandwidth of the modulated signal is two times the modulating signal.
And since no discrete carrier signal is sent after the modulation, this type of
modulation is known as Double Side Band Suppressed Carrier.

This video will be helpful to all the students of science and engineering in understanding the Double Side Band Suppressed Carrier Modulation.

#ALLABOUTELECTRONICS
#modulation
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[ALLABOUTELECTRONICS]

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

[pawatjoy]

this is my whole class in 15 minutes!!

[ghostgamingshiv]

You explain the most difficult topic in easy way and in less time Best teacher on YouTube for electronic.

[kmrajesh]

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 🙏

[ram]

My teacher even dont let us understand in 1 hours which you just do in 15minutes .thanku sir ❣️❣️

[mullahviking]

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.

[Chwepaepae]

Thank you for the very clear video and illustrations!!

[mishalsarfraz]

You are amazing job.. keep it up.. Love from Pakistan

[loke]

very clear video and with good detail!!

[aldrinnath]

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?

[baghdadiabdellatif]

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’

[isisubhan]

This is my whole 1 lecture (3 hours) in 15 mint😅

[JP-vgvl]

thank you for this video. this is very helpful

[hannap]

Please make more videos on this playlist

[mahendranirgude]

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?

[dhaarialshammri]

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?

[George-nqmx]

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?

[AbdullahOlcay-whor]

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?

[anirudhracs]

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 ?

[dhimanbiswas]

What will be the value of modulation index for DSBSC??