[PD] Re : Re: Is Pd clip the audio output?

Nicolas Danet nicolas.danet at free.fr
Thu Oct 19 17:21:18 CEST 2017

Ok, thus if it there's a clipping it is "after" Pd (or at the I/O API level). Thanks for the confirmation.

----- Mail d'origine -----
De: Claude Heiland-Allen <claude at mathr.co.uk>
À: pd-list at lists.iem.at
Envoyé: Thu, 19 Oct 2017 17:10:12 +0200 (CEST)
Objet: Re: [PD] Is Pd clip the audio output?

On 19/10/17 15:56, Christof Ressi wrote:
> -1 to 1 is the maximum range for floating point audio samples. there's nothing else you can do than clipping if you exceed that range.

A simple test on Linux with JACK shows that Pd doesn't clip audio that
exceeds -1 to 1:

https://mathr.co.uk/tmp/jack-no-clip.png screenshot

Other API may be different, and the driver may clip (or do other
dynamics processing) before sending to the hardware.

>> Von: "Nicolas Danet" <nicolas.danet at free.fr>
>> In the "A02.amplitude.pd" example it is claimed that:
>> "Amplitudes of audio signals can have any reasonable range, but when you output a signal via the dac~ object, the samples should range between -1 and +1. Values out of that range will be clipped."
>> Is that still true in current version (Pd-0.48-0)?
I tested with a less current version:

$ pd -version
Pd-0.47.1 ("") compiled for Debian (0.47.1-3) on 2016/11/28 at 20:56:10 UTC


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