I watched this video trying to figure out what "modulation" was, and this comment literally just blew my mind. Thank you for teaching me AM stood for Amplitude Modulation, and FM was Frequency Modulation. Until literally this point, I thought it was just some fancy Latin jargon or something, so I just let it go. Thank you.
I agree, this is the best simple explanation of modulation I’ve seen. I volunteer as one of the instructors at our local amateur radio club and I’m going to share this video with our basic class. I was just trying to draw this on the whiteboard this morning. Excellent job with the video!
From my knowledge and education in electronics engineering and as an amateur radio operator this is an excellent video to illustrate modulation. I will share this with others to let you so aptly describe modulation so they can learn.
I have searched high and low trying to understand modulation (I just bought a shortwave radio). This is the only explanation I found that helped me understand it. Great video!
Jesus Christ is the only hope in this world no other gods will lead you to heaven There is no security or hope with out Jesus Christ in this world come and repent of all sins today Today is the day of salvation come to the loving savior Today repent and do not go to hell Come to Jesus Christ today Jesus Christ is only way to heaven Repent and follow him today seek his heart Jesus Christ can fill the emptiness he can fill the void Heaven and hell is real cone to the loving savior today Today is the day of salvation tomorrow might be to late come to the loving savior today Holy Spirit Can give you peace guidance and purpose and the Lord will John 3:16-21 16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God. Mark 1.15 15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel. 2 Peter 3:9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance. Hebrews 11:6 6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him. Jesus
Jesus Christ is the only hope in this world no other gods will lead you to heaven There is no security or hope with out Jesus Christ in this world come and repent of all sins today Today is the day of salvation come to the loving savior Today repent and do not go to hell Come to Jesus Christ today Jesus Christ is only way to heaven Repent and follow him today seek his heart Jesus Christ can fill the emptiness he can fill the void Heaven and hell is real cone to the loving savior today Today is the day of salvation tomorrow might be to late come to the loving savior today Holy Spirit Can give you peace guidance and purpose and the Lord will John 3:16-21 16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God. Mark 1.15 15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel. 2 Peter 3:9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance. Hebrews 11:6 6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him. Jesus
carrier waves should be called "reference" wave. Would've saved me a headache. The receiver figures out how the reference wave is changed "modulated" over time and works out the signal wave. This was the best vid and explanation I've found on the net. Thanks.
Great video. Computer modems for telephone lines (I am not sure if hardly anyone uses them anymore) are modulators and demodulators getting the digital binary language of the computer off of an analog telephone signal. The sound that you would hear if someone picked up another telephone in another room on the same line (weird sound) I believe would be the audio representation of those 1's and 0's.
Also, this is a great video. It is always good though to explain the AM and FM band of commercial radio and that other radio frequencies can be either AM or FM(old CB radios verses some or most walkie talkies)
Very helpful for newbies like me to understanding AM and FM modulation. But I have a question: For the original AM radio, I grasp that the radio dial would adjust the carrier _frequency_ (in kHz) to "tune" to a broadcast radio "band", and the circuitry would demodulate out the amplitude of the original source signal (prior to modulation, i.e., signal combination). Good so far. But for FM... I'm a bit confused. If _frequency_ is again used as the carrier signal to enable "band" selection (this time, in MHz), but now the source signal *also* uses frequency and is combined or "modulated" with the carrier signal, and has the effect of slowing down or speeding up the overall frequency of the carrier signal... then my question is, how can a radio tuned to a very precise radio frequency, say "98.9 MHz", not experience cut outs when the combined signal drops in and out of that specific band frequency? Stated slightly differently, with AM, while the amplitude of the overall signal is modulated to encode the source signal with a higher and lower amplitude. But it still remains locked to a set carrier frequency. Thus, a radio can "tune" into that set frequency and the proceed to demodulate out the source signal. But with FM, if the overall frequency is shifting around due to the combined carrier and source signals modulating on frequency instead of amplitude, how can a radio "lock onto" a set radio channel or "frequency" if the frequency its self is changing due to modulation?
I have been struggling to get a clear explanation of this.This is the best I've found so far. Can you suggest any scientists who discovered/ worked out the concept of modulation at its simplest level?
He has a picture on his site of Alexander Graham Bell transmitting data via modulated light waves from the sun in 1880. That seems pretty significant if nothing else.
The superposition actually was used - to encode color on top of the luminance signal of television/video. The phase shift from the reference ("color burst") at the beginning of each video scan line was the tint/color, the amplitude of the added color frequency was the color intensity ;-) That's why old black and white televisions without a color frequency filter showed checkerboards and moirée patterns when receiving a color signal...
Only Jesus Christ blood can cleanse us of are sins come to Jesus Christ today Romans 6:23 For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord. Come to Jesus Christ today Jesus Christ is only way to heaven Repent and follow him today seek his heart Jesus Christ can fill the emptiness he can fill the void. The Holy Spirit can lead you guide and confort you through it all Heaven and hell is real cone to the loving savior today Today is the day of salvation tomorrow might be to late come to the loving savior today John 3:16-21 16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God. Mark 1.15 15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel. 2 Peter 3:9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance. Hebrews 11:6 6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him. Jesus
Firstly Thanks you for all the efforts and kindness and the Explanation. Could you please also share the Circuit Diagrams for the AM Modulator Circuit along with the components values so that I can realize the thing by constructing the circuit on BreadBoard/WishBoard ?
That unit with solar panel with speaker , what is it called ? And if you can give link to purchase this with light modulator flash . Thanks..link in description is not working
In the early days of radio, FM was thought to be impossible. Also, you can receive more than one AM signal at a time, but not with FM, it has to be one or the other. You might could have mentioned this.
Now I have a clear understanding of the basics of am and fm. Now to find a video that explains an electronic circuit of a transmitter that converts audio sound to am or fm.
Do R/C (radio controlled) models still use AM and FM? It has been a long time since I have flown the aircraft and back when I began, it was AM, FM or PCM (which was supposed to be the best).
In AM or FM, the source signal (sound) contains both volume changes and frequency changes. I've never been clear how AM or FM encode for both. Amplitude changes are kind of obvious, but frequency changes? Not so much. Does this have to do with bandwidth? How do two frequencies get modulated? It can't be just the amplitude of the carrier, can it?
If I understand correctly, in FM, the broadcast frequency is the center of a small frequency bandwidth. Within that bandwidth, the frequency (rate) of deviation of the center frequency corresponds to source frequency. The amount of frequency deviation from the center frequency corresponds to source amplitude. It helps to think of it in the frequency domain as well as the time domain.
Modulation is changing the property of one wave (the carrier wave) based on the *value* of another wave (the signal). The value of a wave as a function of time is the immediate displacement of the oscillator that produces the wave, but frequency or amplitude are properties of the whole wave, or at least a local region of it around a specific point in time. You don't need to "encode" properties of the function like the amplitude or frequency, you just encode the function itself, as variations in the amplitude or frequency of the resulting wave.
Could you possibly manipulate frequency, modulation, etc, to make a high frequency energy signal like bluetooth mimic a lower frequency signal like rf? Could you manipulate bluetooth in a way that allows it to interact with rf devices?
Thanks, that was great! I watched a bunch of videos, but this one helps me visualize more readily. I am wondering how the modulating signal is applied to the "data". You demonstrated that it is not addition of the waves, but what it is it? Division? Is it by applying the calculus function of a sine wave with the desired parameters for frequency and amplitude?
What modulation scheme does high bandwidth fiber transmission lines use? Is it QAM OFDM like cell towers and HFC plants are or is it something totally different?
I came to ask my own question but this one really got me thinking! I may be wrong, but I believe the modulation is happening to the light output (voltage / frequency shifts), rather than the actual photons of light or the wavelength. Bear in mind that wavelengths of light are orders of magnitude shorter than audio / radio and shouldn’t be a factor when considering either of the modulation frequencies. Obviously more light means more photons, but my thinking is that the LED chip in the torch will naturally have its own combination of wavelengths being emitted, which the circuitry can’t control. I imagine this would vary slightly depending on the output power, ambient conditions, etc., but I don’t think a solar panel should be able to distinguish between these in such a manner. I think if our eyes were infinitely sensitive, we would be able to see the brightness of the light varying very slightly as the modulated signal is transmitted, in the same way many LEDs use PWM to effectively dim. If photons or the wavelengths of the torch light were being altered, the variation would be seen in the colour of the light, rather than the brightness. Again… I think! 😂
Hello while in FM. the frequency of combinations of carrier signal and source signal is changed allover the time how my radio can receive the source signal at one frequency? thank you
I was hit with some questions and this answered a whole lot of them. My last one is how advanced chips would you need to have in order for this to work. To me it seems like you need to do some math to undo the modulation and that sounds like it would need some kind of chip doing math to turn it back into what it originally was. Perhaps I underestimate the computing power of old first and second generation radios but I am looking for how that process works specifically
How is signal added to carrier wave? What exactly occurs in the spot where they are added together? Why does carrier wave change just because signal is added to it? What device is used to add the carrier wave and the signal wave together? What happens at the other end, how is signal extracted from the composite waves, how is done and by what?
Yeah, this part could've been a bit clearer. Adding them up generates the wave that he said it was NOT a modulated signal. You, actually, have to multiply the two trig functions to get the modulated signal.
This was very helpful. Your visual examples were great. I’m just getting in RF so could you put together another video on why we need to modulate the message? Maybe I missed it in this video.
A couple of reasons to modulate a higher frequency carrier wave would be to transmit the signal farther and also the antennas can be smaller. The higher the carrier frequency (the one you are modulating) the smaller the antenna can be. For example, a 1 MHz signal has a 1/2 wavelength (for dipole antenna) of 468 feet vs a 1GHz signal with a 1/2 wavelength of .468 feet (~14.3 cm). In his case the antenna is the size of light waves ... so, pretty small!
If one hooked up an AM antenna, tuned to a specific frequency, to their skull or ear bone, they couldn’t make out anything intelligible, correct? They might pick up changes in amplitude, but without a decoder, couldn’t make out audio?
What would you say when I told you that it is not amplitude modulation instead it is intensity modulation. C is all ways equal to frequency × wave length with any electro magnetic wave. Amplitude is strictly varying with frequency.
That speaker he showed in the beginning of the video looks like an old Atari paddle controller! That's what I thought that was for a split sec before he told what it was! ☺️ Makes me feel like a dummy a tiny bit!!🤪🥴🤭🙂🙃🙂
I’m a ham operator. And this is THE best explanation of AM vs FM I’ve ever seen!
I watched this video trying to figure out what "modulation" was, and this comment literally just blew my mind. Thank you for teaching me AM stood for Amplitude Modulation, and FM was Frequency Modulation. Until literally this point, I thought it was just some fancy Latin jargon or something, so I just let it go. Thank you.
I agree, this is the best simple explanation of modulation I’ve seen. I volunteer as one of the instructors at our local amateur radio club and I’m going to share this video with our basic class. I was just trying to draw this on the whiteboard this morning. Excellent job with the video!
From my knowledge and education in electronics engineering and as an amateur radio operator this is an excellent video to illustrate modulation. I will share this with others to let you so aptly describe modulation so they can learn.
I have searched high and low trying to understand modulation (I just bought a shortwave radio). This is the only explanation I found that helped me understand it. Great video!
Jesus Christ is the only hope in this world no other gods will lead you to heaven
There is no security or hope with out Jesus Christ in this world come and repent of all sins today
Today is the day of salvation come to the loving savior Today repent and do not go to hell
Come to Jesus Christ today
Jesus Christ is only way to heaven
Repent and follow him today seek his heart Jesus Christ can fill the emptiness he can fill the void
Heaven and hell is real cone to the loving savior today
Today is the day of salvation tomorrow might be to late come to the loving savior today
Holy Spirit Can give you peace guidance and purpose and the Lord will
John 3:16-21
16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.
Mark 1.15
15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel.
2 Peter 3:9
The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
Hebrews 11:6
6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
Jesus
That light modulator is so unbelievably cool!
THAT was amazing. Immediately got my attention. I knew I was going to learn something.
I'm just delving into the shortwave radio world and have been looking for a clear explanation with demonstration of AM/FM. This was perfect! Thank you
Glad it helped. .
Jesus Christ is the only hope in this world no other gods will lead you to heaven
There is no security or hope with out Jesus Christ in this world come and repent of all sins today
Today is the day of salvation come to the loving savior Today repent and do not go to hell
Come to Jesus Christ today
Jesus Christ is only way to heaven
Repent and follow him today seek his heart Jesus Christ can fill the emptiness he can fill the void
Heaven and hell is real cone to the loving savior today
Today is the day of salvation tomorrow might be to late come to the loving savior today
Holy Spirit Can give you peace guidance and purpose and the Lord will
John 3:16-21
16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.
Mark 1.15
15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel.
2 Peter 3:9
The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
Hebrews 11:6
6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
Jesus
carrier waves should be called "reference" wave. Would've saved me a headache. The receiver figures out how the reference wave is changed "modulated" over time and works out the signal wave. This was the best vid and explanation I've found on the net. Thanks.
Yeah, the word carrier confused me into thinking I didn’t understand FM.
this is ultra comprehensive, now i don't have problem knowing how AM and FM work. thank u sir.
Thanks
Great video. Computer modems for telephone lines (I am not sure if hardly anyone uses them anymore) are modulators and demodulators getting the digital binary language of the computer off of an analog telephone signal. The sound that you would hear if someone picked up another telephone in another room on the same line (weird sound) I believe would be the audio representation of those 1's and 0's.
Thanks!
Also, this is a great video. It is always good though to explain the AM and FM band of commercial radio and that other radio frequencies can be either AM or FM(old CB radios verses some or most walkie talkies)
Blinded by the Light by Manfred Manns Earth Band: Composed by Bruce Sprinstein. Now known as Transmitted by the Light by HSPE.
This vídeo should have a lot more views! It is amazing. I wish I found it before! Great job
Thanks
Honestly you have opened up my mind on modulation ...Thanks alot
excellent, best explanation i've heard, congrats!
this was really well done for most youtube videos thank you
Well done! Really cool light device, too!
thank you sir for your perfect lecture about this concept
Incredibly good, thank you!
It was phenomenal
Perfect video. Great job thank you so much
Good practical explanation I got some practical knowledge from this video
For student like me is excellent video
Thanks
Thanks to you, I got the help I needed
confusing, best explanation so far. thank you Paul
This is the most amazing thing I’ve ever seen
You're a wizard Paul. Pure magic!
Thanks
Thank you, this is a wonderful demonstration!
Tank You Very Much for this explaination!
Excellent!
Wow! This has helped me tremendously. Thank you so much sir! Feeling more confident!
Glad it helped!
Excellent demo. I now have a much better understanding. Thanks!!
Very cool demonstration
Very good video!!!!
Very helpful for newbies like me to understanding AM and FM modulation. But I have a question: For the original AM radio, I grasp that the radio dial would adjust the carrier _frequency_ (in kHz) to "tune" to a broadcast radio "band", and the circuitry would demodulate out the amplitude of the original source signal (prior to modulation, i.e., signal combination). Good so far. But for FM... I'm a bit confused. If _frequency_ is again used as the carrier signal to enable "band" selection (this time, in MHz), but now the source signal *also* uses frequency and is combined or "modulated" with the carrier signal, and has the effect of slowing down or speeding up the overall frequency of the carrier signal... then my question is, how can a radio tuned to a very precise radio frequency, say "98.9 MHz", not experience cut outs when the combined signal drops in and out of that specific band frequency?
Stated slightly differently, with AM, while the amplitude of the overall signal is modulated to encode the source signal with a higher and lower amplitude. But it still remains locked to a set carrier frequency. Thus, a radio can "tune" into that set frequency and the proceed to demodulate out the source signal. But with FM, if the overall frequency is shifting around due to the combined carrier and source signals modulating on frequency instead of amplitude, how can a radio "lock onto" a set radio channel or "frequency" if the frequency its self is changing due to modulation?
Great question, we need answers!
This is a great and fundamental demonstration. Thank you!
You’re welcome.
I have been struggling to get a clear explanation of this.This is the best I've found so far. Can you suggest any scientists who discovered/ worked out the concept of modulation at its simplest level?
He has a picture on his site of Alexander Graham Bell transmitting data via modulated light waves from the sun in 1880. That seems pretty significant if nothing else.
TH-cam Kathy Loves Physics. She often explains the thought processes, right and wrong, of the people behind the revelations in physics.
@@troys6965 Thank you
i totally agree with you
The superposition actually was used - to encode color on top of the luminance signal of television/video. The phase shift from the reference ("color burst") at the beginning of each video scan line was the tint/color, the amplitude of the added color frequency was the color intensity ;-)
That's why old black and white televisions without a color frequency filter showed checkerboards and moirée patterns when receiving a color signal...
Only Jesus Christ blood can cleanse us of are sins come to Jesus Christ today
Romans 6:23
For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
Come to Jesus Christ today
Jesus Christ is only way to heaven
Repent and follow him today seek his heart Jesus Christ can fill the emptiness he can fill the void.
The Holy Spirit can lead you guide and confort you through it all
Heaven and hell is real cone to the loving savior today
Today is the day of salvation tomorrow might be to late come to the loving savior today
John 3:16-21
16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.
Mark 1.15
15 And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel.
2 Peter 3:9
The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
Hebrews 11:6
6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
Jesus
Awesome! Loved it and great job!
Blinded by the Light.
Amazing demonstration. Thank you🦑
Thx for the vid, trying to pick up some loop I keep hearing everywhere.
Thank you!
Awesome video - thanks so much
Geat explanation!! Thanks
Wonderful! Thank you!
This was extremely helpful!
Firstly Thanks you for all the efforts and kindness and the Explanation.
Could you please also share the Circuit Diagrams for the AM Modulator Circuit along with the components values so that I can realize the thing by constructing the circuit on BreadBoard/WishBoard ?
As an amateur musician, I refer to FM as Vibrato Broadcasting and AM as Tremolo Broadcasting
Love it.
Amazing Info
Thanks
That unit with solar panel with speaker , what is it called ? And if you can give link to purchase this with light modulator flash . Thanks..link in description is not working
Blinded by the Light! 👍
really loved learning this stuff pr
i adore this video
Wow man this is such a great video I love it. :)
In the early days of radio, FM was thought to be impossible. Also, you can receive more than one AM signal at a time, but not with FM, it has to be one or the other. You might could have mentioned this.
which software you use for showing amplitude modulation. If you like tou share such kind of free available software it would be great for us
Now I have a clear understanding of the basics of am and fm. Now to find a video that explains an electronic circuit of a transmitter that converts audio sound to am or fm.
Did you find one?
Do R/C (radio controlled) models still use AM and FM? It has been a long time since I have flown the aircraft and back when I began, it was AM, FM or PCM (which was supposed to be the best).
Your the best
In AM or FM, the source signal (sound) contains both volume changes and frequency changes. I've never been clear how AM or FM encode for both. Amplitude changes are kind of obvious, but frequency changes? Not so much. Does this have to do with bandwidth? How do two frequencies get modulated? It can't be just the amplitude of the carrier, can it?
If I understand correctly, in FM, the broadcast frequency is the center of a small frequency bandwidth. Within that bandwidth, the frequency (rate) of deviation of the center frequency corresponds to source frequency. The amount of frequency deviation from the center frequency corresponds to source amplitude. It helps to think of it in the frequency domain as well as the time domain.
TH-cam channel Kathy Loves Physics.
Modulation is changing the property of one wave (the carrier wave) based on the *value* of another wave (the signal). The value of a wave as a function of time is the immediate displacement of the oscillator that produces the wave, but frequency or amplitude are properties of the whole wave, or at least a local region of it around a specific point in time. You don't need to "encode" properties of the function like the amplitude or frequency, you just encode the function itself, as variations in the amplitude or frequency of the resulting wave.
Great video, good job!
Could you possibly manipulate frequency, modulation, etc, to make a high frequency energy signal like bluetooth mimic a lower frequency signal like rf? Could you manipulate bluetooth in a way that allows it to interact with rf devices?
What software you used to show the animation?
Here you go
academo.org/demos/amplitude-modulation/
In FM, how do the frequencies of the carrier wave vary? Based on the amplitude of the sitat that instant?
Thanks, that was great! I watched a bunch of videos, but this one helps me visualize more readily. I am wondering how the modulating signal is applied to the "data". You demonstrated that it is not addition of the waves, but what it is it? Division? Is it by applying the calculus function of a sine wave with the desired parameters for frequency and amplitude?
Pretty crazy how our brains have created all this in the 3D. The brain is making itself and continues.
What modulation scheme does high bandwidth fiber transmission lines use? Is it QAM OFDM like cell towers and HFC plants are or is it something totally different?
my mind has been blown
But are there essentially two distinct photons (of distinct wavelengths) jumbled together (for AM)?
I came to ask my own question but this one really got me thinking!
I may be wrong, but I believe the modulation is happening to the light output (voltage / frequency shifts), rather than the actual photons of light or the wavelength. Bear in mind that wavelengths of light are orders of magnitude shorter than audio / radio and shouldn’t be a factor when considering either of the modulation frequencies. Obviously more light means more photons, but my thinking is that the LED chip in the torch will naturally have its own combination of wavelengths being emitted, which the circuitry can’t control. I imagine this would vary slightly depending on the output power, ambient conditions, etc., but I don’t think a solar panel should be able to distinguish between these in such a manner.
I think if our eyes were infinitely sensitive, we would be able to see the brightness of the light varying very slightly as the modulated signal is transmitted, in the same way many LEDs use PWM to effectively dim. If photons or the wavelengths of the torch light were being altered, the variation would be seen in the colour of the light, rather than the brightness.
Again… I think! 😂
Thanks. Very clear.
Hello
while in FM. the frequency of combinations of carrier signal and source signal is changed allover the time how my radio can receive the source signal at one frequency?
thank you
Where do the sidebands come in?
thanks , what is the name of program you used to see the waves
See academo.org/demos/amplitude-modulation/
4:43 - You might also call this "DC bias modulation".
I was hit with some questions and this answered a whole lot of them.
My last one is how advanced chips would you need to have in order for this to work.
To me it seems like you need to do some math to undo the modulation and that sounds like it would need some kind of chip doing math to turn it back into what it originally was. Perhaps I underestimate the computing power of old first and second generation radios but I am looking for how that process works specifically
Yes. That’s what demodulators do.
How is signal added to carrier wave? What exactly occurs in the spot where they are added together? Why does carrier wave change just because signal is added to it? What device is used to add the carrier wave and the signal wave together? What happens at the other end, how is signal extracted from the composite waves, how is done and by what?
Yeah, this part could've been a bit clearer. Adding them up generates the wave that he said it was NOT a modulated signal. You, actually, have to multiply the two trig functions to get the modulated signal.
Any one want to chime in? What exactly is a signal. What exactly is a carrier wave. Vibrating air? Absorption/emission of an atom?
You guys really are going to need graduation in Telecom for that. Those answers answered in deep detail takes time to study and learn.
@@gabrielfalcao2952 hello: Do you know how the modulation and demodulation work and why they work?
@@jupitersaturnuranusneptune2816 A bit. I'm still mid semester.
The waveforms he showed as signal is sinusoidal. Are they sinusoidal in real world applications?
This was very helpful. Your visual examples were great. I’m just getting in RF so could you put together another video on why we need to modulate the message? Maybe I missed it in this video.
Modulation means to change. It’s not the message that’s modulated it’s the carrier wave in such a way that carries the message.
A couple of reasons to modulate a higher frequency carrier wave would be to transmit the signal farther and also the antennas can be smaller. The higher the carrier frequency (the one you are modulating) the smaller the antenna can be. For example, a 1 MHz signal has a 1/2 wavelength (for dipole antenna) of 468 feet vs a 1GHz signal with a 1/2 wavelength of .468 feet (~14.3 cm). In his case the antenna is the size of light waves ... so, pretty small!
That's awesome so is that song listen to it when you're really high
If one hooked up an AM antenna, tuned to a specific frequency, to their skull or ear bone, they couldn’t make out anything intelligible, correct? They might pick up changes in amplitude, but without a decoder, couldn’t make out audio?
What would you say when I told you that it is not amplitude modulation instead it is intensity modulation. C is all ways equal to frequency × wave length with any electro magnetic wave. Amplitude is strictly varying with frequency.
This is great but how does the demodulator actually work? Like is there some sort of computer code involved? What’s the math to extract the signal?
Where did you get the animation to explain AM and FM Modulation?
Yes I have got little bit explanation about modulation
cool video :)
Thanks good content recommend by Radio Amateurs of/du Canada (RAC) course. 💜🇨🇦
Amazing devices! How can one make them or get them? :)
how can i do FM over light?
easy to understand
You need a picture of Nikola Tesla in your wall as well
I do!
which app or website that u use to visualize the waves pls?
i use octave/matlab. Its excellent for analog and digital signals
@@panagiotisk9670 i'll consider, appreciate that
you saved me
I want a video about dsb fm with the circuit that doing it
Thanks!
Welcome!
Why is it so interesting?
MODULE MODULATED SIGNALS IS LIKE FC UK STARBUCK KING HAM AND CHEEZY SQUEEZED BY FRENCH BIGETTE OH LA LA WAHAHHAHAHAHA
what was that song tho?:D
Blinded by the Light by Manfred Mann's Earth Band
Sorry thanks for this presentation
thank oyu
That speaker he showed in the beginning of the video looks like an old Atari paddle controller! That's what I thought that was for a split sec before he told what it was! ☺️
Makes me feel like a dummy a tiny bit!!🤪🥴🤭🙂🙃🙂