Re: [chuck-users] Sound glitches at the start of descending tones

20 Jun 2018

      Thanks, Michael and JP!

I ended up using this, which takes the log of a number between 1 and 2,
instead of trying to take the log of a number near zero:

    // constantly falling frequency
    2.0 * STARTING_FREQ *
    Math.pow(2.0, -1.0 * Math.log2((1.0*(i +
OCTAVE_STEPS))/(1.0*OCTAVE_STEPS))) => r.freq;

That works fine.

On Tue, Jun 19, 2018 at 10:45 PM JP Yépez  wrote:
...
Hey Forrest,
What Michael said... I slowed down the script to "10::ms => now", and I
noticed that the sounds at the beginning were pure aliasing (which I kinda
loved tbh).
I think it might be related to the pow+log line in your else block at the
bottom; maybe it's getting too close to 0 or something? I used (i+10)
instead of 'i' as a quick fix, and it seemed to do it, but I'm not sure if
that's the sound you're going for.
Hope it helps!
JP
STARTING_FREQ *
...
Math.pow(2.0, -1.0 * Math.log2((1.0*(i+10))/(1.0*OCTAVE_STEPS)))
=> r.freq;
On 20/06/2018, at 4:40 PM, Michael Heuer  wrote:
Hello Forrest,
You may want to check your frequency maths -- I added <<>>; to the loop and the odd sounds at the beginning are
frequencies way above human hearing range.
0.000000 300.000000
0.005000 3000000.000000
0.010000 1500000.000000
0.015000 1000000.000000
0.020000 750000.000000
0.025000 600000.000000
0.030000 500000.000000
0.035000 428571.428571
0.040000 375000.000000
0.045000 333333.333333
0.050000 300000.000000
...
Cheers,
michael
On Tue, Jun 19, 2018 at 11:22 PM, Forrest Cahoon 
...
wrote:
...
I'm attempting to play with descending tones, but I'm having artifacts at
the beginning of the sound. I tried to start with a gain of 0 but this does
not prevent the glitch.
I've used various sorts of oscillators; when I use SinOsc there is just a
glitch at the very beginning of the sound, but with SqrOsc and others there
is what sounds sort of like LFO amplitude modulation for maybe even a
second into the sound.
Here is my code. How do I fix this?
SqrOsc r => dac;  // also try SinOsc, TriOsc, and SawOsc
300.0 => float STARTING_FREQ;
10000 => int OCTAVE_STEPS;
for (0 => int i; i < OCTAVE_STEPS ; i++) {
// making an envelope by manipulating the gain
    if (i < 100) {
        i * 0.005 => r.gain;
    } else if (i > OCTAVE_STEPS - 100) {
        (OCTAVE_STEPS - i) * 0.005 => r.gain;
    } else {
        0.5 => r.gain;
    }
// constantly falling frequency
    if (i == 0) {
        STARTING_FREQ => r.freq;
    } else {
        STARTING_FREQ *
        Math.pow(2.0, -1.0 * Math.log2((1.0*i)/(1.0*OCTAVE_STEPS))) =>
r.freq;
    }
    1::ms => now;
}
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