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How Information Travels Wirelessly
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- Опубликовано: 8 мар 2012
- Understanding how we use electromagnetic waves to transmit information.
License: Creative Commons BY-NC-SA
More information at k12videos.mit.edu/terms-condit...
This is absolutely brilliant. I am a very senior citizen trying to learn subjects that I was supposed to learn many years ago. I thought it was Impossible until now. Thank you, thank you, thank you
yea my man I'm 24 if I can do it why couldn't you
Amazing how you clarified hundreds of book pages in less than 8 minutes. You are my hero!
wallyaudio your right you can only understand this if you already know this
1:26 the density of air does not change...does the density of water change as a wave travels through it?! Absolutely not.
@@ajcook7777 looks like you have shallow knowledge on this subject..
Hari Kishore This is a great explanation for people with limited science background. This video is not directed towards his staff at MIT
Agreed. Thanks to EEE
Crazy how we take things like this for granted. So cool learning this stuff. Amazing video.
Agree, this is basically witchcraft 😂
Once you understand how it works, the really amazing thing is the speed at which it works.
GolfSauce This is revolutionary it's almost an experiment when figuring this out because you can't visually see a wave , this is pure genius
@@ob1keno227 The more witchcraft-y thing is that it is not witchcraft at all. We understand it very well, through hundreds of years of progress of science, technology, engineering and math. Take some physics classes and it won't be "witchcraft" anymore.
Yea, this is not our tecnology. Aliens are sharing this to us as time gets by.
People don't see the impossible jump from one technology to another. Only know to say "ThERe ArE GeNiUsEs".
Don't forget to say that when receiving the waves of FM the device that receives them decodes the waves from a already written library of numbers for each wave. So this is why its so fast, each wave is already programmed to read FM .This is why AM radio is not as good as FM As am does not decode it just reads the waves as a high or low pitch wave. The reason this is so important is people still don't understand how it works as a whole.
So each radio depending on who created it, works with a already written program to decode each wave as a one or zero.
If you only have a AM radio it does not have any prerecorded information in it so it just picks up the waves and send them to your speaker. We use to call it a echo machine as it would just echo wave sounds into your speaker.
But FM will read the waves like zeros and ones depending on the burst of frequency of each wave. If its one short blast or wave, then its a one. if there is a relaxed wave its a zero. The higher the range for the wave, the higher the pitch, the lower the wave or the more relaxed the burst, the lower the pitch.
So that's why FM is called digital (in terms of transmitting 0 and 1) in this video?
@@Rafa-yw8nu Yes because it is digital.
So FM radio was always digital since the 1930s it was invented ? ? ?
@@MrBeen992 yes and no, over the years it's advanced to be what it is. Like with WiFi. But yes, you are right. But the wave was recorded and received different.
@@GameCreatorOfGod OK, but this video doesnt explain how FM transmited information before the digital age
Yes! The carrier frequency for Wi-Fi is about 2.4 GHz, which is the same frequency as the radiation emitted by most microwaves. This is why microwaves can interfere with Wi-Fi signals.
We used a Wacom tablet and the SmoothDraw software to make the video.
“Ear does some complicated process to transcribe those into sound”
Ear: bitch this shit aint complicated
I am in love with how you teach and simplify all of the problems the most of the student face your genius well done I hope all the teacher and professors out there learn from you
Wow. This video looks simple, but did an AMAZING job explaining it.
All these years of using a smartphone and today is the first time I have stumbled upon how they work.
The explanation is so on point that there is nothing to discard.
I've been trying to answer this question for years. You answered it simply and made perfect sense. Thank you
I’m still confused as to how a computer translates these numbers
@@antoinieeugene they convert these waves into electrical signals using a transducer and from there, signal processing takes place
you're a gifted teacher
I have been trying to understand it from 3 hours and you just did it in less then 8 mins !!! I mean wow!! ❤️
That's really helpful！It took me less than ten minutes to understand the basic of wireless communication.
Perfectly explained! Great curser writing too!
You are a genius, the way how you simplified the explanation is great! Thank you.
I’ve just learned about electro waves in 8mins then 5 years in school. Thank goddess To people like you and technology!
I only studied business and managed to understand your explanation so easily! You're awesome!!!
Thank you so much for this video! Much love and peace!
Videos like this make me love RUclips so much! Xoxo
Thank u bro. I like the start by saying you saw waves caused in a lake all that stuff.
Amazing explanation. It's all clear now. Thank you!
wow of al the videos i searched this is the one i needed!!
great tutorial... thanks for the simplification
so easy to understand! Thanks so much!
Man I've read so much articles on this, and this short 7+ mins video drives the point home better than all those articles. Thanks, now the search ends here.
Any idea what this type of study would be called for a college course/degree?
What a super video, it was a thing i was wondering about for a long time how that works, thanks for simplifying so intresting !
hi i'm italian and i'm using your video to learning english and electricity :D THANKS
It was a super fantastic explanation. I knew about the waves and that information in bits. But I was missing the link between them.
WONDERFUL PRACTICAL PRESENTATION!!! THANK YOU !!!
Very well explained. Thank you
Awesome video. Easily understood the concepts.
Short and sweet but powerful!!
thanks for this video
i understood perfectly
Computer only understand 1 and 0... While youre sending high and low frequency the receiver will demodulate the signal and depending to it's corresponding combination of 1s and 0s the original information will be retrieved . I love how you made the example from analog to digital signal. Thank you 🙏
absolutely great!
This guy just cleared my concept which was giving me stress. Thnks bro
Great video!
This the way to teach ,,which majority of lacking...thanks 👍 bro love from INDIA
Great tutorial!
If you want to find the key to the universe think in terms of energy , Frequency and vibration - Nikola Tesla 1856 - 1943
I'll wait for someone to make a video about that one too
@@captainaffection hahahahaha
Heat and magnetic field also i think
This is pretty true, but then people take those terms and make up fantastical ways to apply them to humans.
We are radios. All life is sound phonons vibration measurement at speed of light hz, watts......
Atomic, biolectric.
Off topic-> you're an artistic person your handwriting and wave drawing is so clean to look at
Awesome video!
thanks! i finally found what i looking for
Big help thank you !
Really help ful im sending this by frequency modulation
The best explanation!
Great job, bro
Very helpful thanks!
Loved this video. Leaves me wondering how FM radio works, though. How are complex sounds transmitted via analog?
the video is very informative. thank you
AWESOME VIDEO SIR........
Plus visible light, nice job on the video
Thanks for sharing
So good response to query ...🙏🙏thanks 👍👍
Great video.
Thank you. So clear.
This was really helpful
Hello,
Could you please let me know the modulation scheme to be used for the following requirement
"The system must convey telephone quality voice, photographs and 2-way 1kbit/s data:
Carrier frequency should be 1 GHz
Thank You
That was great! Thanks
This was unreal. Thankyou
Great information...
Thank you for this information.
thanks so much bro. great work keep it up
Thank you. My brain is satisfied with the answers you have given in this video. I can go to sleep now.
Hey, awesome video. What software you're using for the writing part?
Nice video, Mr...
What software was used for this?
Very good, thank you x
With the case of AM you said the receiving device has to listen out for a specific frequency. What does the receiving device have to listen out for in the case of FM?
Question, is it possible to exchange the electromagnetic aspect for sound? Instead of using high frequency radio waves use high frequency sound waves? Attempting a project that prohibits electromagnetic anything and trying to have longish distance communication between devices.
So the FM wave is also transported by a carrier wave? In that case, does a higher frequency carrier wave imply larger data transfer rates?
cooldude 4172 yup
Thanks for this but i still dont understand how the sound wave is attached to the carrier wave. Please put me right on this. A sound wave enters a microphone and the vibrations are converted to EM waves. These EM waves by means of modulation are loaded onto carrier waves(but how?)and the carrier waves are sent out to be picked up by antennae and the process is reversed so you hear sound at the receiving end. I am nearly correct?
How many Hertz are the waves modulated by in fm? Also, is this how WiFi routers transmit data in homes and such? It seems like not a lot of data can be transmitted if it’s like Morse code. And can radio waves on specific frequencies be time delayed to create digits? If so, is that better than actually changing the frequency? So many questions.
Carrier waves are interacted with signal waves coming from some radio station to change the amplitude, right? Is this done when we change to different AM stations on the radio? What are carrier waves?
What exactly do you do to achieve this? Could you please make it clearer? Thanks!
Really amazing ty
How would I go about making a transmitter and a receiver that use bluetooth to communicate?
Heartfelt thanks
there is something i still dont gate
that signal that ur sending is the electromagnetic wave or is it literally the sound signal, etc ?
great explanation
Great job sir thanks
Beautiful explanation
Hello, Great video! What did you use to make the drawings on the screen?
Well explained...
world needs more heroes like you
Thanks. This vidio is very helpful. I
Is the reason they don't just send 0 signal to represent a 0 because then you'd have to constantly be turning the electro magnet on and off which is inefficient and complex or because the receiver will just inteerperet it as a bunch of 1s?
What happens to the electrical signal as it reaches the radio wave? Does it generates a high frequency electrical signals and low voltage or maybe I'm mistaken?
Hungry for more!! How can you create these waves? How can you change the frequency? Can you combine AM and FM to send more information in less time?
Well Explained Buddy
To the point answer, i liked it
You choose your radio channel depending on its frequency, but with FM does it still recognizes it even though the frequency is modulated?
It's all fine and solid and it nakes sense if there was only one receiver and one transmitter but that's hardly the case. If two devices are sending radio waves at the very same frequency how do you how which is which?
Well, he was explaining the core concept of how waves communicate data/information. Not how a radio works in detail.
Just another comment to say you are awesome. You are awesome
Dude, you deserve a Nobel, in my opinion
Nice explanation! But I don't get how cell phones can modulate the frequency to encode information without 'falling out' of the frequency range it needs to identify the network? Like 'in the 2.4 Ghz range' and all that.
THIS IS SO INSANE MY MIND HAS BLOWN!!!!
Thank you!
THANK YOU!!!
Very nice and informative
you deserve my subscribe. great teacher. keep it up! salute, but you dont explain about wifi, 2G, 3G, also 4G please!
I have a question. If some radio stations transmit information via frequency modulation and others transmit information via amplitude modulation. How do radio's that pick up these waves distinguish between different radio stations
there is usually a little switch on the radio that the user flicks then tunes in