[PD] Pd on a headless Raspberry Pi
pimassat at gmail.com
Wed Aug 29 09:15:10 CEST 2012
Nope, I used a randomly generated sequence of notes made with phasors,
ranging from 0 to 127 on the midi scale.
Anyway, the quality of the analog output is not what concerns me here,
since it sounds ok with aplay. The problem is that the same type of sound
generated directly in Pd makes an awful lot of noise when i launch Pd at
start-up, though it sounds ok on the hdmi output.
Maybe it's something about the samplerate, no idea really.
It's a pity that no real serious documentation exists on how the audio
works (like the fact that the analog output is switched off when the hdmi
in plugged in : is it in the hardware ? can it be configured to not work
this way ?).
I'll try an ask on the RPi forum.
Nicorette is a brand that sells patches to stop smoking in France. I
thought it was funny :)
2012/8/29 Michael Zacherl <sdiy-mz01 at blauwurf.info>
> On 28.8.2012, at 22:53 , Pierre Massat wrote:
> > Hi again,
> > just a quick update : I tried running aplay at start-up (the same way I
> was running Pd), with the same type of audio data (a simple 44,1KHz wav
> file recorded from the Pd patch i'm testing the Pi with). It sounds much
> better than Pd on the analog output.
> > So it should be an issue with Pd itself. Perhaps it start to quickly. I
> dont know...
> just a short note: did you use a sine-sweep file for your test with
> aplay? Or something similar smooth and simple?
> I reckon the built-in PWM-output can handle complex sounds better than
> simple ones.
> I'm having some sort of deja-vu - didn't we discuss that some weeks ago?
> BTW, nicorette?? :-)
> > Cheers,
> > Pierre.
> > 2012/8/28 m.e.grimm <megrimm at gmail.com>
> > hey pierre,
> > what r u using for line-in? i have one of these:
> > http://www.amazon.com/gp/product/B0069L9PZA/ref=oh_details_o04_s01_i01
> > but have not had the chance to try it.
> > im curious what might be the best usb in/out for cheap.
> > i also got this:
> > http://www.amazon.com/gp/product/B005CLMJLU/ref=oh_details_o02_s00_i00
> > so i can ssh in on my local network (headless). although i have not
> > tried it w/out the powered usb hub.
> > just my own status update.
> > m
> > On Tue, Aug 28, 2012 at 3:10 PM, Pierre Massat <pimassat at gmail.com>
> > > Hi all,
> > >
> > > I succesfully ran Pd on a headless Raspberry Pi (which is no big feat
> > > se. I've written a tutorial here :
> > >
> > > but i'm getting a really heavily distorted sound from the analog
> > > No idea why...
> > > Any experience to share?
> > >
> > > Cheers,
> > >
> > > Pierre.
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