btw, for adjusting the index, you're just multiplying the frequency to the index, you should also multiply it by 2pi (like Jean found out by accident).
2017-06-04 12:29 GMT-03:00 Alexandre Torres Porres <por...@gmail.com>: > > > 2017-06-04 4:24 GMT-03:00 mario buoninfante <mario.buoninfa...@gmail.com>: >> >> this is the simplest modulation, that usually is considered as FM, but in >> the end is a PM. >> > Well, as I see it, it should be either FM or PM, it can't be one but in > the end is something else. And your code is can only (not usually) be > considered FM. > > But it seems you're saying both are related, without getting into details > - which is something we've already discussed here, and I've also pointed > out (with no details either). But the bottom line is that they're > different, and the same input parameters generate different results. Though > I've said before the parameters can be "converted"/"adjusted" to sound > the same. > > Namely, the same modulation index does not generate the same result (Jean > noticed that), and I can add the detail that the same modulating > signal/waveform generate different results too. For example, a triangular > wave modulating the phase is the same as a square wave modulating the > frequency. So, they're quite different. > > In terms of sine waves, what we've been doing so far, if you modulate the > phase with a sine wave, you need to modulate the frequency with a cosine > wave. > > Like I pointed before, if you're going for a phase modulation > implementation, you should just modulate the phase instead of trying to > replicate it via frequency modulation, cause it's just more convenient to > do directly via phase modulation if you want it to behave like that. > > And that noted, several FM modules are not actually implemented via > frequency modulation, but phase modulation (i.e DX7 and native's > instruments FM8). > > Anyway, performing FM in Chuck is easy and straightforward, it was never a > question. The relationship between FM and PM was known and does not really > mean they're both the same thing. > > Hence, there's still a need to quest for an easy implementation of phase > modulation. > > cheers >
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