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

[Forrest Cahoon]

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 <jpyepezimc at gmail.com> 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 <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
> > 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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>> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
>>
>>
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