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 Forum index » DIY Hardware and Software » ChucK programming language
ChucK: Bugs & Suggestions
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kijjaz



Joined: Sep 20, 2004
Posts: 765
Location: bangkok, thailand
Audio files: 4

PostPosted: Mon Apr 16, 2007 3:12 pm    Post subject: ChucK: Bugs & Suggestions Reply with quote  Mark this post and the followings unread

i'm experiencing some butterworth filter problems now in this new version.
i didn't noticed it before but since i didn't have much problem with normal freq and Q usage in the last version,
i guess this might be a bug or is it one behavior of its algorithms?

let's hear out this code:
Code:
Noise s => LPF f1 => dac;
0.5 => f1.gain;
1.0 => f1.Q;

<<< "LPF sweep up" >>>;
for(int i; i < 100; i++)
{ (i - 100) * 200 => f1.freq; 100::ms => now; }
<<< "LPF sweep down" >>>;
for(int i; i < 100; i++)
{ (100 - i) * 200 => f1.freq; 100::ms => now; }

s =< f1;
s => HPF f2 => dac;
0.5 => f2.gain;
1.0 => f2.Q;

<<< "HPF sweep up" >>>;
for(int i; i < 100; i++)
{ (i - 100) * 200 => f2.freq; 100::ms => now; }
<<< "HPF sweep down" >>>;
for(int i; i < 100; i++)
{ (100 - i) * 200 => f2.freq; 100::ms => now; }

s =< f2;
s => BPF f3 => dac;
0.5 => f3.gain;
1.0 => f3.Q;

<<< "BPF sweep up" >>>;
for(int i; i < 100; i++)
{ (i - 100) * 200 => f3.freq; 100::ms => now; }
<<< "BPF sweep down" >>>;
for(int i; i < 100; i++)
{ (100 - i) * 200 => f3.freq; 100::ms => now; }

s =< f3;
s => BRF f4 => dac;
0.5 => f4.gain;
1.0 => f4.Q;

<<< "BRF sweep up" >>>;
for(int i; i < 100; i++)
{ (i - 100) * 200 => f4.freq; 100::ms => now; }
<<< "BRF sweep down" >>>;
for(int i; i < 100; i++)
{ (100 - i) * 200 => f4.freq; 100::ms => now; }

<<< "test ended." >>>;


i'm going to check with the older chuck-1.2.0.7 version also.

i started to see something wrong when i'm using a HPF the same way i used.
sometimes it works but most of the time it's going crazy.
most of the time it's just quiet.

so is anyone experiencing this also?
i'm gonna compare to the older version as soon as possible
(re-installing / re-compiling hahaah).
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kijjaz



Joined: Sep 20, 2004
Posts: 765
Location: bangkok, thailand
Audio files: 4

PostPosted: Mon Apr 16, 2007 3:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

i've just tested the above code in 1.2.0.7 - 1.2.0.8
and the sound really blows up the same way in both version,
so i guess i've just seen the problem
(but still doubting with normal use of HPF in 1.2.0.8 when i experience quietness sometimes)
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