[PD] pix2sig and back

Jack jack at rybn.org
Tue Oct 24 14:44:37 CEST 2017

Do you have a laptop with a discrete GPU (nvidia) and an integrated GPU
(intel) ? Which one do you use ? Have you tried with the other GPU ?
What is your OS ?
Seems you are using the NVidia on a Linux (if i am right) ?


Le 24/10/2017 à 07:18, Peter P. a écrit :
> Hi list,
> I am trying to convert an audio signal to pixel data using pix_sig2pix~
> and then back to audio data using pix_pix2sig~ without further
> manipulations. Please see attached patch.
> I do scale the audio signal from -1 to 1 to lie in a range compliant
> to pixel data, which I assume to be 0 to 1.
> Not having connected an input to the subpatch, this signal will hence be
> 0.5 and will display in the red color channel.
> Converting that red channel back to audio signals and doing the opposite
> scaling operation, I am getting a 51dB constant signal at the output
> even without having attached a signal to the input of pix_sig2pix~.
> Checking with a snapshot~ object indicates a constant signal of 0.003921
> I assume this to be due to limited resolution numbers in the pixel data
> and wonder what their resolution is?
> Then I texture the pixel data onto a rectangle. This rectangle
> does flicker and flip diagonally from time to time and I wonder if it is
> an error on my machine only and where it could come from.
> Also, I am getting an error message in the Pd console upon creating a
> single pix_sig2pix~ object in an empty patch:
> 	GEM: Someone sent a bogus pointer to copy2Image
> and am curious if this red error message is related to the above problem...
> Thank you for all ideas and advice!
> Peter
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