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23. Modulation, Part 1 

MIT OpenCourseWare
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29 окт 2024

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Комментарии : 57   
@jonahansen
@jonahansen Год назад
What a great exposition of the theory of modulation as well as the history of its use for one of its most widely used applications!
@naveengupta212
@naveengupta212 Год назад
Superb explanation, prof. Scientific findings with historical background. A great way to engage the class.
@cosmic_husky
@cosmic_husky 9 лет назад
1. "It takes lots of power if the antenna is significantly smaller than the wavelength of interest." 04:00 2. He wants to construct a lambda antenna, but what about spatial sampling theorem? 07:30 3. X(omega - omega_c) 13:20 3. "Frequency Division Multiplexing: Frequencies have to be high compared to the message frequency." 25:00 4. Modulation and aliasing? 25:45
@felixdiaz4438
@felixdiaz4438 Год назад
👍
@cosmic_husky
@cosmic_husky 9 лет назад
How to see conjugate symmetry? 15:45 Multiplying cosine with a function so the product becomes 1 is a bad idea, as with the zeros the function would have to go to infinity. 22:30 Synchronous modulation. 22:50 (You have to be exactly synchronized in phase?) Red and blue Dirac? 26:45
@aldritch_lol
@aldritch_lol 5 лет назад
This professor kinda sounds like Heath Ledger's Joker lol
@BoyanSotirov
@BoyanSotirov Год назад
What a great lecture indeed!
@KakashiChidori616
@KakashiChidori616 6 лет назад
watch NPTEL (IIT Delhi)analog communication lectures by Prof Surendra Prasad.he is absolute gold.
@MohamedElsheikh22
@MohamedElsheikh22 11 лет назад
Thank YOU I used to watch the 1975 course, It was pretty good but ofc we need something new :) Thanks MIT because U changed the world
@manuelillanes1635
@manuelillanes1635 5 лет назад
is that old course still up?
@soufianefariss
@soufianefariss 7 лет назад
DAMN!May the gods bless him
@sunnyboy866
@sunnyboy866 5 лет назад
A great tutor with awesome explanations. Thanks for the lecture
@jarrodanderson2124
@jarrodanderson2124 3 года назад
Excellent lecture from a brilliant sprite ❤
@Moonsabie
@Moonsabie 11 лет назад
loved his instruction very social
@joelc.corbin2995
@joelc.corbin2995 6 месяцев назад
Modulation (Part 2) is missing from the playlist, but is available on the mit website.
@mitocw
@mitocw 6 месяцев назад
Just checked the MIT OCW playlist and it's there. Maybe you are using a different playlist? MIT OCW's playlist: ru-vid.com/group/PLUl4u3cNGP61kdPAOC7CzFjJZ8f1eMUxs. Best wishes on your studies!
@maxflix96
@maxflix96 7 лет назад
I like that they use the metric system :)
@motjones2341
@motjones2341 Год назад
and then, sidebands appear out of nowhere, by choosing the correct formula, none of these professors actually know, in a technical way, how those sidebands appear in a technical sense. it is called amplitude modulation because when originally thought up the composite showed an amplitude modulation and the changing of the plate voltage of the tube, no one suspected the presence of sidebands until over a decade later. And here we are teaching with composite waveforms to perpetuate the misnaming. It is like the direction of electron current flow, professors just keep teaching what is passed along even if it is wrong, because they can not unlearn what they initially learned. So, do you, after watching this, know where the sidebands came from without resorting to parroting the formulas above....I did not think so.
@hmopa
@hmopa 8 лет назад
thank you for the lecture .
@JuliaLing
@JuliaLing 3 года назад
Really enjoyed this! Thank you!
@abelashenafi6291
@abelashenafi6291 8 лет назад
thanks for the lecture
@TheAhmedMAhmed
@TheAhmedMAhmed 10 лет назад
great lecture, thanks!
@hemantabrahma7494
@hemantabrahma7494 5 лет назад
very nice lecture.
@hacihocni6156
@hacihocni6156 4 года назад
Thank you
@ayanmosh
@ayanmosh 11 лет назад
Pardon my ignorance, but doesn't e^(-jwt) = cos(wt)-jsin(wt)? instead of cos+isin?
@dhanamkoilraj9608
@dhanamkoilraj9608 7 лет назад
I think it has something to do with split complex number. Just google it,
@mattpopovich
@mattpopovich 5 лет назад
15:57 for anyone else curious. I believe you are correct Sergio and that the instructor missed the negative sign as e^(jwt) = cos(wt)+j sin(wt) but e^(-jwt) = cos(wt) -j sin(wt).
@bbbeee12e233
@bbbeee12e233 5 лет назад
thanks for awesome lecture!
@PeterPinch
@PeterPinch 11 лет назад
What are your expecting to get from MIT OpenCourseWare, if not videos like this? Or is the problem the volume?
@SeverSpanulescu
@SeverSpanulescu 3 года назад
Actually, the antenna length should be lamda/4 or lambda/2.
@jonahansen
@jonahansen Год назад
True, but the point is still valid.
@sonjak8265
@sonjak8265 4 года назад
Tesla was the inventor of radio.
@jonahansen
@jonahansen Год назад
Uh, no.
@Er.Sunil.Pedgaonkar
@Er.Sunil.Pedgaonkar 2 года назад
Good
@plan101
@plan101 11 лет назад
I will be leaving now
@jonahansen
@jonahansen Год назад
It's OK to praise the Lord!
@cyrilbatolo2656
@cyrilbatolo2656 6 лет назад
how do you choose R and C value in the circuit?
@jonahansen
@jonahansen Год назад
Just a low pass filter so the corner is about at the highest signal frequency needed: f = 1/ (2*pi*R*C)
@felixdiaz4438
@felixdiaz4438 Год назад
👌
@BillyBonin
@BillyBonin 8 лет назад
Professor Frink!!
@PrinceSingh-vo3gp
@PrinceSingh-vo3gp 9 лет назад
nice lacture
@corblaak8051
@corblaak8051 8 лет назад
His modulation is hot hahah
@JackLe1127
@JackLe1127 8 лет назад
he can modulate me anytime
@joeblow4938
@joeblow4938 5 лет назад
when a teacher asks the class questions over and over again and no one can answer it, means you suck at teaching the material
@AllenAndersonTaylor
@AllenAndersonTaylor 5 лет назад
He's kind of smug.
@Mikehibbett
@Mikehibbett Год назад
I don't think the lecturer is in touch with his students... Brilliant person, not a great teacher
@plan101
@plan101 11 лет назад
The course materials is very much IT technology and the explanation of, And it spams my understanding in the objective analysis due the information containing IT technology in the mere example of a module. Much rather have a business module explanation which gets into the different types of business within a control list in enumerated way,which presents meta data or styles of a business which might determine the provisions in ramifications to create an off sets that has been procured.
@theodorechandra8450
@theodorechandra8450 7 лет назад
I'm sorry, but how would modulation be used in business?
@migkillerphantom
@migkillerphantom 5 лет назад
get a load of this nigga tryna sound smart before even learning to english lmao
@jeffcard3623
@jeffcard3623 4 года назад
Weed plays those tricks on your mind, making you think you have had an epiphany of brilliance, some revelation of pure genius. Really though, you are just confused. Revisit your idea when you are sober and lucid and you realize how dumb your idea was.
@plan101
@plan101 Год назад
The field of study is a particular approach in the academe
@Smeak686
@Smeak686 11 лет назад
Great lecture! Thank you.
@soniaelwardi8736
@soniaelwardi8736 6 лет назад
Thank you
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