Bugs item #1561839, was opened at 2006-09-19 18:31
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Category: puredata
Group: v0.40.0
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Hans-Christoph Steiner (eighthave)
Assigned to: Nobody/Anonymous (nobody)
Summary: rhythmic glitching on PowerBook G4
Initial Comment:
On an Apple PowerBook G4 1.67GHz running 10.4.7, the
sound always had a pulsing glitch on it no matter if
any sound was being generated or not. When I switched
the output sampling rate to 48000, the glitching went
away. When I switched back to 44100, the glitching
came back.
I saw this one other time on a PowerBook, but it was
also happening to Audacity. This time it was only
happening for Pd. My guess is that its related to
portaudio.
This was on a student's laptop, so I can't test again.
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Comment By: Nobody/Anonymous (nobody)
Date: 2007-09-08 10:00
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I don't know if this belongs here:
system:
mac os 10.4.8
1.25 GHz PowerPC G4
All my fft-based patches are not working anymore with
Pd-0.39.3-extended-rc5-macosx104-powerpc.
As described by Ed Richardson on his Powebook G4, 1.67GHz (10.4.7) "there
is a fairly loud single pop, upon which all audio ceases on the computer
altogether. Audio will only resume once I quit Pd."
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Comment By: Hans-Christoph Steiner (eighthave)
Date: 2007-01-16 07:30
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I saw this on another PowerBook G4 1.67GHz. That seems to be the only
model affected. Setting to 48000 fixed it also.
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Comment By: Fred Inklaar (inklaar)
Date: 2006-11-27 17:51
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OK, because of zmoelnig's comment I also tested vanilla pd-0.39-2 on my
PowerBook. Unfortunately, that did *not* solve the problem, the pulsing
glitch is there anyway,
But the problem is also slightly different than Hans-Christoph's
description: I *do* need to generate a sound to hear the glitching pulse.
Doesn't matter what sound, sinus or noise. The output sound gets dropped
and restored very frequently, on a regular interval. That is what causes
the pulsating glitch. So, without output no restore, thus no pulse.
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Comment By: Fred Inklaar (inklaar)
Date: 2006-11-27 17:42
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This bug is present in all versions I tested above Pd version
0.38.4-extended-RC8.
The highest version I tested was Pd version 0.40-2 on:
Computernaam: PowerBook G4 15"
Computermodel: PowerBook5,8
Processortype: PowerPC G4 (1.5)
Aantal processors: 1
Processorsnelheid: 1.67 GHz
L2-cache (per processor): 512 KB
Geheugen: 1 GB
Bussnelheid:167 MHz
Opstart-ROM-versie: 4.9.6f0
With the following audio card specs:
Ingebouwde geluidskaart:
Apparaten:
Crystal Semiconductor CS84xx:
Ingangen en uitgangen:
Digitale S/PDIF-invoer:
Hoorbaar: Ja
Plugincode: Topaz
Burr Brown PCM3052:
Ingangen en uitgangen:
Interne microfoon:
Regelaars:Geluid uit, Master
Hoorbaar: Nee
Plugincode: Onyx
Lijnniveau-ingang:
Regelaars:Geluid uit, Master
Hoorbaar: Nee
Plugincode: Onyx
Digitale S/PDIF-uitvoer:
Regelaars:Geluid uit
Plugincode: Onyx
Interne luidsprekers:
Regelaars:Geluid uit, Links, Rechts
Plugincode: Onyx
Lijnniveau-uitgang:
Regelaars:Geluid uit, Links, Rechts
Plugincode: Onyx
The pulsing glitch is present when the audio card is set to the following
frequencies (by using the Audio/Midi-configuratie Utility), all on 16-bit:
44100 Hz
88200 Hz (faster pulse)
96000 Hz (even faster pulse)
The glitch is not present when the audio card is set to:
32000 Hz
48000 Hz
64000 Hz
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Comment By: IOhannes m zm�lnig (zmoelnig)
Date: 2006-10-11 00:22
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experienced something similar on a G4 iBook (of a student,
so don't ask for details...) with an RME fireface.
this only happened with pd-extended (if i only knew the
version...0.38, 0.39??), running vanilla pd-0.39-2 did solve
the problem.
the test was the "test audio and midi" sinewaves.
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