Understanding Amplitude Modulation

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Rohde Schwarz

Rohde Schwarz

День тому

This video explains the fundamental concepts behind amplitude modulation (AM), common applications of AM signals, and how AM signals are measured.
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КОМЕНТАРІ: 48
@zprogress4004
@zprogress4004 3 роки тому
I wish these videos (+FM) could be out 1 year ago... so good
@ab_ab_c
@ab_ab_c 3 роки тому
Wow! Very well done! Thank you!
@frawding9438
@frawding9438 3 роки тому
Thanks for this. Really helped with my signals coursework
@jhonelalbarracin7436
@jhonelalbarracin7436 3 роки тому
Thank you Senpai.
@4BohrKid
@4BohrKid 2 роки тому
Wow, this video helped me understand my AM modulation lab so much. Thank you 🙏
@pauldenisowski
@pauldenisowski Рік тому
Glad it was helpful - thanks for the feedback!
@kimkim5416
@kimkim5416 3 роки тому
Thank you!
@suchirasenevitathne7017
@suchirasenevitathne7017 Рік тому
This is very helpful to understand the basics of AM. Thanks.
@pauldenisowski
@pauldenisowski Рік тому
Thank you!
@sagunraul3031
@sagunraul3031 4 роки тому
Thank you sir ❤️❤️❤️❤️ from 🇮🇳 india
@saleemraza2778
@saleemraza2778 3 роки тому
Thanks very very much. Love u
@Daluk0
@Daluk0 3 роки тому
Thanks for creating this video series. But at timestamp 4:40, you need NdB as the input to the formula. So as m = 2 * 10^( NdB / 20 )
@pauldenisowski
@pauldenisowski 3 роки тому
Yes, absolutely -- you can re-arrange the formula that way to solve for m given a measured value of N. This is actually how this measurement is normally made using a spectrum analyzer. Thanks!
@sofianebenhamza4985
@sofianebenhamza4985 Рік тому
Thanks for your presentation , it's very rich and simple to understand
@pauldenisowski
@pauldenisowski Рік тому
Thanks! Appreciate the feedback!
@ernstuzhansky
@ernstuzhansky Рік тому
Thanks!
@ego-qx1wv
@ego-qx1wv 3 роки тому
Hello, just to point out that the amplitude of each sideband is half of the amplitude of the sinusoid: F{ Am*cos(ŋ*t) } = Am/2 [ @(f+ŋ) + @(f-ŋ) ] with @ as the dirac delta dist. Great Video
@pauldenisowski
@pauldenisowski 3 роки тому
Thanks!
@DrGarry4145
@DrGarry4145 3 роки тому
Amplitude of sideband is not strictly 1/2 of carrier. You can change the amplitude by changing m ratio
@ESEben10
@ESEben10 3 роки тому
very good man! I would like just o ask something: I don't know if it is a misunderstanding mine or some mistake on the presentation, but I saw a contradition between the 3:30 and 4:56. On 3:30 we have a low signal changing for m=0.1 but on 4:56 a highly changing amplitude of spectrum for the same value of m. How to understand this?
@pauldenisowski
@pauldenisowski 3 роки тому
Good question. The graph at 3:30 shows the signal in the *time domain* (power vs. time) and the graph at 4:56 shows the signal in the *frequency domain* (power vs. frequency).
@ESEben10
@ESEben10 3 роки тому
@@pauldenisowski then a low amplitude proportion in time domain can correspond to a high amplitude proportion in frequency domain?
@hhatiget6898
@hhatiget6898 3 роки тому
good thanks
@yTb2801082331
@yTb2801082331 2 роки тому
Professional video !
@pauldenisowski
@pauldenisowski Рік тому
Thanks - I try :)
@tedwang2996
@tedwang2996 5 місяців тому
why you draw the rf signal in sine wave, I mean the most common case, it is not sin/cosine?
@thatzaw7082
@thatzaw7082 3 роки тому
thank
@poorman-trending
@poorman-trending 2 роки тому
I’m struggling understanding where the side bands come from. If you are modulating the carrier, and the only thing changing is the amplitude, why would there be other frequencies involved?
@tomb9878
@tomb9878 10 місяців тому
Side band refers to the "bands" of frequencies on the X axis to the left and/or right of the carrier. The X axis is frequency and Y axis is "energy" of each shown frequency.
@gnosistalks9568
@gnosistalks9568 6 місяців тому
@poorman8317 did you got the answer , cauz I'm stuck with the same point.
@TomR459
@TomR459 3 місяці тому
Carrier + modulation into a mixer sum and difference gets ur sidebands
@Kingyuaerik
@Kingyuaerik Місяць тому
I think its their Harmonics, depending on modulating signsl
@nohrtillman8734
@nohrtillman8734 18 днів тому
Every video explanation I look at just states “here are the side bands of different frequencies” and leave it at that. If the intelligence is in different frequencies its frequency modulation. The 1000hz modulation is in the magnitude (amplitude) of the fixed frequency wave. Not the side bands. Why is it always presented this way?
@md.sazzadhossain1834
@md.sazzadhossain1834 3 роки тому
sir,will u explain me the sidebands please? i've many doubts about sidebands.
@manfredcaranci6234
@manfredcaranci6234 3 роки тому
There are upper and lower sidebands, or side frequencies. The UPPER sideband is made up of the SUM of the carrier plus the modulating frequencies, while the LOWER sideband is the DIFFERENCE between the carrier and the modulating frequencies. Modulation, whether amplitude (AM), frequency (FM), or phase (PM) always involves the production of sidebands.
@stormbytes
@stormbytes 2 роки тому
Consider adding Greek 101 as a prerequisite.
@pauldenisowski
@pauldenisowski 2 роки тому
(laughs) γηράσκω δ᾽ αἰεὶ πολλὰ διδασκόμενος :)
@johnlevis3648
@johnlevis3648 2 роки тому
Greetings from Greece
@nohrtillman8734
@nohrtillman8734 18 днів тому
Does not compute. At 2:42 in the time domain, the blue line (carrier) amplitude increases and decreases with time. Amplitude of the carrier frequency is clearly changing/modulating. At 4:22 in the frequency domain, the blue line representing the carrier at that frequency is suddenly now a fixed value. Further on at 5:16, the carrier amplitude is described as constant. Both cannot be true. Many people struggle with this. Just saying.
@marcusanderson9042
@marcusanderson9042 3 роки тому
When did you get Brent Spiner to voiceover this? lol
@pauldenisowski
@pauldenisowski 3 роки тому
I could never hold a candle to Commander Data :) Besides, if you listen closely, you'll hear me using contractions ...
@alimuqaibel7619
@alimuqaibel7619 3 роки тому
You might find this video relevant: Amplitude Modulation the Big Picture ukposts.info/have/v-deo/p6qXe4NroKGnln0.html
@remnantministries9398
@remnantministries9398 2 роки тому
This explanation of AM makes too many assumptions to be useful, not to mention it moves too fast.
@pauldenisowski
@pauldenisowski Рік тому
The video does assume a certain amount of background knowledge - if you have suggestions about what "pre-viewing" content might have been helpful, please let us know!
@zainabalbakaa6127
@zainabalbakaa6127 10 місяців тому
You have helped me more than you can imagine🥹🥹🥹
@pauldenisowski
@pauldenisowski 9 місяців тому
Glad to hear it - thanks!
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