[PD] [sqosc~]-issues

[Derek Holzer]

I get "nan" when I blow up a filter or delay line. It's synonymous with 
pure DC offset to me. The soundcard of course filters it, but it's 
basically a pure positive or negative signal up to that point. Some 
LADSPAs do it to me as well, like "Foldover Distortion" and some others.

best,
d.

Roman Haefeli wrote:
> hi again
> 
> i've come a bit closer to the source of the problem:
> 
> when i load patch that contains a [sqosc~], whose first inlet~ is
> connected with a tilde-object, that sends a zero-signal immediately
> after loading the patch (e.g [line~]), the first outlet~ of [sqosc~]
> sends a 'nan' (not a number?). at least, this is what [env~]-[nbx] tells
> me.
> when i change the frequency to some non-zero value and change it back to
> zero, [env~]-[nbx] says '96.47', which is the expected value, i think. i
> assume, this 'nan'-signal is the reason, why my jackd goes crazy. the
> problem does not occur anymore when i send [0.001, 0 1( to the [line~]
> on loadbang. 
> 
> i attached a little test-patch to show you, what happens here. i
> couldn't test it on other systems/versions of pd/audio-apis.
> 
> roman
> 
> On Sun, 2007-03-25 at 21:46 -0400, Martin Peach wrote:
>> Chris McCormick wrote:
>>> On Sun, Mar 25, 2007 at 07:23:13PM +0200, Roman Haefeli wrote:
>>>   
>>>> [sqosc~]. it can happen, that after loading the patch, pd is sending
>>>> constantly a dc to my soundcard. even when i close pd, the dc stays on
>>>> these channels, where pd was connected before over jack. to get rid of
>>>>     
>>> This happens on my laptop and I am pretty sure it occurs on a hardware
>>> level (in my case). The DC is present sometimes after just playing half
>>> an mp3 file and then hitting ctrl-C, and definately happens when doing
>>> stuff in Pd sometimes.
>>>
>>>   
>> How can you guys tell if there's DC in the signal? I'd love to get a 
>> sound card that outputs DC!
>>
>> Martin
>>
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>> ------------------------------------------------------------------------
>>
>> #N canvas 276 167 640 276 10;
>> #X obj 25 80 sqosc~ 300 0.5 15000;
>> #X obj 25 103 env~;
>> #X floatatom 25 125 0 0 0 0 - - -;
>> #X obj 25 53 sig~ 0;
>> #X obj 227 76 sqosc~ 300 0.5 15000;
>> #X obj 227 99 env~;
>> #X floatatom 227 121 0 0 0 0 - - -;
>> #X obj 227 50 sig~ 1;
>> #X text 226 28 non-zero signal;
>> #X text 27 27 zero signal;
>> #X text 84 129 <- nan;
>> #X text 287 123 <- 96.48;
>> #X obj 448 142 sqosc~ 300 0.5 15000;
>> #X obj 448 165 env~;
>> #X floatatom 448 187 0 0 0 0 - - -;
>> #X obj 447 65 loadbang;
>> #X text 443 29 solution;
>> #X msg 447 91 5 \, 0 1;
>> #X obj 447 118 line~;
>> #X text 505 190 <- 96.48;
>> #X connect 0 0 1 0;
>> #X connect 1 0 2 0;
>> #X connect 3 0 0 0;
>> #X connect 4 0 5 0;
>> #X connect 5 0 6 0;
>> #X connect 7 0 4 0;
>> #X connect 12 0 13 0;
>> #X connect 13 0 14 0;
>> #X connect 15 0 17 0;
>> #X connect 17 0 18 0;
>> #X connect 18 0 12 0;
>>
>> ------------------------------------------------------------------------
>>
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-- 
derek holzer ::: http://www.umatic.nl
---Oblique Strategy # 57:
"Do the words need changing?"