[chuck-users] phase modulation and hard sync?

Alexandre Torres Porres porres at gmail.com
Sun Jun 4 11:29:39 EDT 2017

2017-06-04 4:24 GMT-03:00 mario buoninfante <mario.buoninfante at 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

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

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