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

[JP Yépez]

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 <heuermh at gmail.com> wrote:
> 
> Hello Forrest,
> 
> You may want to check your frequency maths -- I added <<<r.gain(), r.freq()>>>; 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 <forrest.cahoon at gmail.com <mailto:forrest.cahoon at gmail.com>> 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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