Understanding Frequency Modulation
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- čas přidán 1. 04. 2020
- This video explains the fundamental concepts behind frequency modulation (FM), common applications of FM signals, the difference between narrowband and wideband FM, and how FM signals are measured.
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This video does the best job explaining FM out of all the videos I have seen
Thank you!
The first video about FM that explains how radio stations can be told apart. The whole concept of deviation and spacing in frequency is well explained. Thanks
Nice, short, and informative video. Thanks.
Thank you for helping me understanding FM
great explanation! easy and thorough.. thanks
Crystal clear 👌👌❤
Super concise and clear video 🙌
Thanks!
Hey nice video and thanks a lot! If I understand correctly, the deviation ratio is exactly the concept: modulation index=delta_f_max/f_m, as what I learned in the RF electronic courses, right? From my lecture, the modulation index is a function of the voltage amplitude of the modulating signal. So if I use an external source (10kHz) to generate the modulating signal, and set the maximum frequency deviation on the R&S as, for example, 100kHz. Will the frequency deviation change if I change the voltage amplitude of my external source?
great explanation!
Great video. Thanks
Thank you
Thank you so much!
Bruh ur username 😭😭💀
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 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?
Modulation involves changing some property of the carrier (in this case, its frequency) based on the modulating signal - they're not really "added" together. In the case of FM, a special device called an FM (de)modulator is used. The actual details of how the carrier frequency is changed by the modulating signal (and how the modulating information is recovered at the received) is somewhat beyond the scope of this introduction, but there are many, many sources of information on this if you'd like to deeper. [Incidentally, there are multiple different techniques for demodulating an FM signal, e.g. quadrature, PLL, etc.]
Can you do one about Phase modulation?
Purely analog phase modulation is pretty rare, but I did make a video about Phase Shift Keying as well as one on APSK and QAM :)
Is this the the same guy from Afrotechmods? They sound really the same. Like my first reaction was "WTH!!!"
(laughs) You know, I've watched Afrotechmods many times and I never really noticed the similarity until you mentioned it. But no, entirely different person - I do all of my own recordings myself, for better or for worse :)
I missed a bit the fact that frequency and phase are interlocked in each other in your formula. Each FM can be described as phase modulation.
Yes, I'm nitpicking...
Not nitpicking at all, just something I didn't have the time to go into in this video :)
What is the maximum modulating frequency?
It's infinite
Another nitpick: The maximum modulating frequency of commercial FM radio broadcasts is not 15kHz but rather over 38kHz due to the stereo encoding and even over 57kHz for added information (RDS in Europe, TTY/CC in North America)...
Now I understand - you meant the usable audio spectrum - yes that is 15 kHz and the first FM radios had it even lower (13-14kHz) to have their rather bad analog low pass filters to mask out the pilot tone. I love FM. I built my own FM stereo receiver 1986 at age 15. And when disabling the stereo decoding and low pass - you could record the mono FM signal on a tape machine and actually hearing the pilot tone when running the tape at half speed...
Anyone else end up here trying to understand their yamaha dx?
Trying to understand Diva Vst here...
xD
Yup, Reface DX owner here. Also pretty good: www.sfu.ca/~truax/fmtut.html
As you've all probably noticed, this video is really more about FM in the radio frequency domain, not the audio domain :)
@@pauldenisowski Still useful to visualize. Also when you thing of the sidebands as harmonic content it all fits. Unless I completely missed the boat ^^
If you have any Playlist on the topic of Communication Systems, put the link below ⬇️.
We do not have a dedicated playlist on that topic, but you might find what you are looking for in different videos on our channel.
it moved up n down and side to side neg.n pos. change calls (frequency)
positive n negative changes on a battery 🔋 power operate
battery 🔋 operation🪫 on/off
Thank you