Alexandre,
I have translated a PD patch (see the last graph on this page
<http://pd-tutorial.com/english/ch03s06.html>) and it is modulating AND
responding to frequency changes. See if this does the trick for you
(doesn't sound exactly like your SC code, but I think some fiddling with
modulation index can be useful):
Step imp; // now I am using an impulse to generate sound after calculating
stuff from phasor/sinosc
Phasor carrier; // Miller said to do so ;)
SinOsc modul; // a phasor as carrier, a sinosc as modulator
Gain g; // this object serves only to sum the signals
1 => g.op; // op number 1 is sum.
400 => carrier.freq;
201 => modul.freq;
1 => float ind => modul.gain; // so, modul. signal * index + carrier signal.
imp => dac; // impulse is actually generating sound
carrier => g => blackhole; // both generators go through a Gain object an
then to the blackhole
modul => g; // so that they only lend data to the Impulse generator
while ( true ) { // this loop includes a timed function only to show that
this stuff responds to changes into carrier's frequency
now + 1::second => time later;
while (now < later) {
Math.cos(g.last()) => imp.next; // i am running this through a
Cosine function since Phasor is a ramp (let's smooth that)
1::samp => now;
}
if ( maybe ) 20 + carrier.freq() => carrier.freq;
else -30 + carrier.freq() => carrier.freq;
}
Please notice that Miller Puckette's approach includes using the phasor as
*carrier* and sinosc as *modulator*, so that we can separate phase
treatment and wave generation (phasor + cos). I am using an Impulse
generator in order to be allowed to pass the resulting signal through the
cosine function before sending it to DAC.
Keep trying...
Em dom, 4 de jun de 2017 às 03:34, Alexandre Torres Porres <por...@gmail.com>
escreveu:
> 2017-06-04 2:35 GMT-03:00 Alexandre Torres Porres <por...@gmail.com>:
>>
>>
>> It's not easy to explain, but you found the magic number/formula that
>> makes Frequency modulation sound like Phase Modulation.
>>
>
> Actually, I shouldn't have said this, I don't wanna give you the idea it
> comes down to this, but there are just too many details I didn't want get
> into, sorry. What I can say is that you got pretty close, not 100% there
> yet, and that is not as simple as just doing this every time, it gets more
> complicated.
>
> Sorry again for not getting into the math and everything. What I'd like to
> add is that people use phase modulation 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.
>
> cheers
>
>
> --
Jean Menezes da Rocha
Compositor
Professor
Doutorando em Música pela Universidade Federal da Bahia
_______________________________________________
chuck-users mailing list
chuck-users@lists.cs.princeton.edu
https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
