FM Synthesis & The Grid: Are you doing it wrong?
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- Опубліковано 1 сер 2024
- There is a very common misconception about FM synthesis, namely that it is really Frequency modulation. In most cases, it is not. In this video I give you an explanation on what traditional “FM” really is and how it differs from true frequency modulation.
Phase modulation animation:
khoi.xyz/c/phase-modulation/
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Fascinating stuff connecting the dots between FM, AM, additive and even sampling. More please!
Thanks for the video. It helped me a lot to actually visualize whats going on in true FM synthesis.
I finally understand the FM. The tape head analogy is spot-on. Thank you very much.
Excellent video.
Thank you so much!!! That is exactly the info I needed!!!!
Appreciate it man! It's really helpful
Great video!
I'm gonna have to rethink this Grid patch I'd made!
I tried this yesterday just for fun and with wavetable. Worth a try!
Mathematically FM is time-integrated PM so you could've mentioned doing true FM using a one-pole low-pass filter (that's what a time-integrator is in terms of signal processing).
LFO can work in kilohertz rates and in AC range, so putting base rate to 0 and inputing oscillator to a rate modulation would result in a more linear FM modulation I guess, but it's not so obvious what amount of modulation is right. I usually set at 1, but it seems a bit unstable, as is 1.05 (approximation of C). Either way it gets somewhat similar, but different from PM modulation.
Great tutorials
Thanks for that explanation (Amazing)
I didn't realize that the pitch is weighted differently than the frequency. Thanks for that. But your text is still confusing. FM is FM even if you use the pitch input. That most people say FM but mean PM is something else. Or am I wrong?
Pitch modulation is technically frequency modulation, It’s just not what most people mean when they say “FM”. Kind of like how dirt is technically edible but is not what most people mean when they say “edible”. So I am trying to point out that if you are attempting to do FM but you are modulating pitch, you will not get the results you are looking for.
Yes, there's a log or exp function in there, depending on your point of view. One unit (say, octave) of pitch increase is a 2x increase in frequency. One decrease is one-half. Right?
Thank you
Thanks!
very interesting
I'm going tell you something verry interseting , I have posted it o the bitwig forum and nobidy cares .
At 13:40 you put a gainer at modulators's output .
Now , In the fm 4 synth , under the hood they have added a clipper after the gainer ( which you can't see but its there ) , cause I buld and exact copuy in reaktor
Just increase the output of a modulator in to a carrier of fm4 ( the old bitwig
fm synth ) and look at the oscilloscope , at a certain point the modulation is clipped
You can easilyy test this yourself and compare it with your self made grid patch and put a hard clipper after the modulator's gain
THAAAAAAAANKS ❤️❤️❤️❤️❤️
If I understand correctly, you just need to apply an inverse function to the output of the modulator to translate from frequency to pitch scale. This should be possible with the math modules.
You would also need to phase flip the waveform when you offset into negative numbers of frequency, and since pitch can never reach 0 frequency, it would be hard to convert. Still might be possible, but not easily, and would it really be worth it over just using Phase mod?
how to phase modulate a sampler module using another module. I just realized i can phase modulate basic shape modules inside the grid but the sampler module does not have a phase modulation input
Isnt there a P to F and F to P translator in the grid for this exact purpose?
Nice tutorial. is it possible to reconstruct with the Grig the Moog Model 15 structure?
LOl
Grid does not give you the low level modules to do complicated dsp and most importantly zdf filters .
But the the overall signal flow , yeah sure
But for heavy dsp algoritms , you'll need to turn to either reaktor or max/msp
I took the outputs of two (triangle) oscillators into a multiplier and I get some interesting timbres when changing the pitch/frequency of one of them. Is this considered FM? Like having a carrier and a modulator? Eitherway it sounds good.
No that is AM or Amplitude Modulation. A totally legitimate synthesis technique :)
The Hz value in the waveform generator is stereo spread, not pitch frequency offset
Actually, it is a frequency Offset. It only acts in stereo when you click the "plus/minus" button next to the offset.
So operator from live is also doing PM??
Timber shifts? I didn't know Bitwig lets you work on wood.
Or do you perhaps mean _timbre?_
Pitch vs. frequency... I guess you forgot, that TheGrid offers a function under "Math", called "Logarithm", another one is called "Pwr" - both are made to create exponential values from linear or vice versa... did you know?
If you realize my post here... I'd be interested to know what find out.
The Power module didn’t exist when I made this video, and the Log module is not the right log for pitch, so I don’t think there was a way to make that one work. Also there is the problem of converting negative values into phase flipped positive pitch values. I think even if possible, it will be hard to do and not worth it for me. :) If you find a way to make it work, please do post about it here!
Yes! Those (log, exp) can get you the relationship you desire.
@@briancase6180 If you get it to work in Bitwig, and you are willing to, please send me a link to your file. Thanks!
@@briancase6180 Rightm it worked for me with them
Cool! I haven't had a chance yet to verify my conjecture, but I will, and your experience gives me confidence....
spelt timbre pronounced tam-ber
13:35
So “fm” is really pm and fm is fm....hmmm lol okay mind blownnnn
Valiant effort but, I guess I'm thick, I'm somewhat more confused about the differences than before I started watching. I wonder if it wouldn't be more productive to just do one tutorial on each of the modulation methods and keep us away from all the obfuscation and market speak that the developers and vendors are bombing on us? And... if the tool doesn't do a particular type of modulation, it doesn't do a particular kind of modulation; we should stay away from 'almost' or 'kind-a', etc. It's one of the weaknesses, in my opinion, of Bitwig that it is *so* anchored to the pitch side that it contributes to this kind of confusion; there are other ways of organizing frequencies than the way dictated by the MIDI standard. This is the case particularly when BW are promoting something like The Grid which promises 'true' modular behaviour. Anyway, not to say I don't appreciate your work; it's great. Just need to air this one out a bit. The link to the phase modulation animation is dead for me; it would be great if there were a similar one out there for FM. Pictures, right? Worth a thousand words (and minutes of video.)
timbre is actually pronounced "tahmber" the more you know!
Potato is actually pronounced potato!
1st
Thumbnail : the difference between knowing your shit and knowing you're shit.
Also pronounced tamber, not timber.