[PD] rjdj, was : Re: [equalizer] / [lowshelf] / [highshelf] in purepd!

[volker böhm]

for some reason my mails to the list take ages until they arrive,  
which makes a discussion a little difficult...

ok, something weird going on here. abs~ is not doing what i would  
think it should be doing - calculating the absolute value of the  
incoming signal. instead it simply seems to pass input to output (no  
errors in pd window).

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if i replace abs~ with an abstraction then it works and the zipping  
is gone.
this happens here with pd vanilla 0.42-4.

just tried pd-extended and there it works with abs~.

what could be wrong with my vanilla abs~?




On 29 Mar 2009, at 14:54, Frank Barknecht wrote:
> Hallo,
> volker b?hm hat gesagt: // volker b?hm wrote:
>
>> thanks for posting this.
>> for certain freqs i hear a noticeable periodic "zipping" in the sound
>> (try 230 hz e.g.).
>
> Hm, I don't hear it, but that may be my ears.
>
>> since the algorithm is based on the sinc function (sin(x)/x), i  
>> wonder
>> how pd handles divide by zero in the signal domain. wouldn't you  
>> have to
>> check for that in the code/patch?
>
> A [/~] with no signal in the right inlet in Pd gives 0 as output.
> In saw~.pd x never becomes zero, it's always at least 1.8955. :)
>
> Ciao
> -- 
> Frank
>
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