Bugs item #1561839, was opened at 2006-09-19 21:31 Message generated for change (Comment added) made by eighthave You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=478070&aid=1561839...
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. 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: Hans-Christoph Steiner (eighthave)
Date: 2007-01-16 10:30
Message: Logged In: YES user_id=27104 Originator: YES
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 20:51
Message: Logged In: YES user_id=417856 Originator: NO
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 20:42
Message: Logged In: YES user_id=417856 Originator: NO
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 zmölnig (zmoelnig) Date: 2006-10-11 03:22
Message: Logged In: YES user_id=564396
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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