[PD] Problems stopping strange signal path

Vreahli the Audio Bandit vreahli at gmail.com
Fri Jan 5 05:24:12 CET 2007


Thanks for the help - the example explained a lot. If it is a bug - it's 
also happening on windows as well. In any case - I got it to cease it's 
odd behavior by putting float() around everything in the expr~. :) At 
least now I know what was going on.

Claude Heiland-Allen wrote:
> Hi,
>
> Vreahli the Audio Bandit wrote:
>> Hiya - I'm having some issues with this patch I've been working on. I 
>> just baked up some fancy bit crushing using expr~ and I'd like to 
>> turn it off. On the linear version on the right it stops just fine,
>> however on the left the noise continues to flow out.
>
> What is happening, is that you are getting some "inf" or "nan" output 
> from this:
>
>> #X obj 44 320 expr~ pow((int(pow(($v1*$i2) \, 3))) \, -3);
>
> and "inf" or "nan" multiplied by 0 is "nan".
>
> "nan" <-> 0 transitions appear to be audible from [dac~], which may or 
> may not be a bug.  (tested with JACK and OSS on Linux with Pd-0.39-2 
> and Pd-0.40-1, both from Miller's site).
>
> See attached patch for an example.
>
>
> Claude
> ------------------------------------------------------------------------
>
> #N canvas 0 0 450 300 10;
> #X obj 32 190 *~ 0;
> #X obj 33 68 osc~ 1000;
> #X obj 110 70 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
> -1;
> #X obj 26 257 dac~;
> #X obj 33 127 expr~ pow($v1 \, $v1);
> #X obj 113 182 print~ before;
> #X obj 64 219 print~ after;
> #X obj 110 98 t b b;
> #X connect 0 0 3 0;
> #X connect 0 0 3 1;
> #X connect 0 0 6 0;
> #X connect 1 0 4 0;
> #X connect 2 0 7 0;
> #X connect 4 0 0 0;
> #X connect 4 0 5 0;
> #X connect 7 0 6 0;
> #X connect 7 1 5 0;
>   





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