Frequency domain – tutorial 10: modulation

In this video, we learn about modulation technique which is commonly used in communication systems to send information from transmitter to receiver. The following materials are covered:
1- why modulation is needed in practice
2- how to recover the original signal using de-modulation
3- the math behind modulation and de-modulation
4- modulation and de-modulation in action using a music example
5- how modulation technique enables several radio stations to simultaneously transmit information

Learn Signal Processing 101 in 31 lectures covering time, frequency and Laplace domain in about 8 hours all together:

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References:
[1] Alan V. Oppenheim, Alan S. Willsky, S. Hamid Nawab, Signal & Systems, 2nd Edition, Prentice-Hall, NJ, USA, 1996.
[2] Alan V. Oppenheim, Ronald W. Schafer, Discrete-Time Signal Processing, 3rd Edition, Prentice-Hall, 2009.
[3] Michael D. Adams, Continuous-Time Signals and Systems, University of Victoria, Canada, 2013. Free textbook and lectures (courtesy of Dr. Michael Adams):

[shahlakhalid]

Much thanks, because of you I have not only understood the subject but also I LOVE it.

[fannierioux-gauthier]

Your jokes and your energy is so refreshing ! Learning doesn't have to be a pain, thanks to permit that :D

[BVB]

i completed my batchlor degree, but this 22 min video gives a clear thougt about modulation and tq tq very much for helping

[shafagh_projects]

I just simply can say "It´s Wonderful!". You made the great tutorial on modulation.

[ismailwardak]

AZAMING TEACHING SKILLS THANKS FOR SHARING . I LEARNED SO MUCH

[dvoorganisation]

Nicely Explained Many of my doubts
Thanks

[shabazakhtar]

Thanks Iman, great work. I am revisiting signal processing theory after many years. Your videos have made my life much easier. Would be much appreciated if you can start adding videos for some advance topics. Many thanks.

[dzed]

You just awesome man thank you for all the hard work and the high quality cours can't thank you enough <3

[agostinoi]

Thanks a lot for this playlist!! You are a very good teacher!!! Greetings from Italy ;)

[pkl]

u are awesome~!! by the way, can you tell more about amplitude modulation and frequency modulation? big thanks~!

[DerpsterIV]

>Give me the energy to sleep less

Uhhh that's no good. Please sleep properly.

Thank you for the tutorials.

[y]

Hi Iman, thanks for posting this clip. I was wondering what kind of software do you use for drawing, thanks?

[bigm]

Great job! Thank you!
May I ask a question? What do it mean negative frequencies on your plots? How can you interpret this point? How do it influence on physics? For what do we need negative frequencies?

[prantapr]

Namaste, Imam. Can you tell me how you made the representation of modulation and demodulation of the audio signal?

[Lestibournes]

10:12 - why don't we just divide z(t) by the cosine function to get x(t)? Wouldn't that be simpler and easier? Is it just because of dividing by zero?

[shiridiyenninti]

sir...what power and energy spectral densities in FFT tells us...