this sounds very much like a buffering problem. Try to increase Pd's latency in the audio settings and see if the problem persists. When I'm working with Raspberry Pi + cheap USB soundcards I sometimes have to increase the latency up to 100 ms to get rid of occasional glitches when the CPU load is high.
> Gesendet: Mittwoch, 04. Juli 2018 um 12:44 Uhr > Von: "michael strohmann" <itsnotfa...@gmail.com> > An: pd-list@lists.iem.at > Betreff: Re: [PD] Glitch > > the file i play back is a clean voice recording. > ups, i am actually using readsf~ > will try to record pd internally... > > anybody has experienced that behaviour with ESI 6 Channel Interface? > Cheers! > mkl > > > > > On Wed, 2018-07-04 at 10:53 +0200, michael strohmann wrote: > >> > >> Hello! > >> from time to time my patch produces this beautiful, but unwanted > >> glitch. (audiofile attached) > > > > Sounds like I'm doing doing music. I wouldn't know how to identify the > > glitch aspect of it. How does it sound without the glitch? > > > > Some suggestions to make such things a bit easier: > > * Do not use compressed files to illustrate a glitch. It's hard to > > know what to attribute to the compression and what to the glitch. > > * If possible, provide also an example of how it is supposed to sound. > > * If possible, rather post links to your media files instead of > > attaching them to your mail. There is no point in every list member > > have their mail account filled with media files. > > > >> are there any ideas what could cause this behaviour? > > > > I would first figure out where the glitch happens. Is Pd actually > > generating this sound or is Pd's audio playback glitchy? You can figure > > this out by doing a recording from within Pd with [writesf~]. If the > > result sounds OK, then you know that the glitch happens somewhere > > between Pd and the sound card. If the result is glitchy, then the > > glitch happens already within Pd, for instance because some object or > > your patch is buggy. > > > >> i am running this on a RPi B+, using sfplay~ to playback a 4 Channel > >> Audiofile. > > > > Why are you using [sfplay~] and not the built-in [readsf~]? Does the > > glitch still appear when using [readsf~]? > > > >> the playback is triggered via a sensor/GPIO or via OSC. > > > > This hopefully doesn't matter. > > > >> restarting the RPi eliminates the glitch. > > > > Could be some sound card issue, but check the other things first. > > > > Roman > > > _______________________________________________ > Pd-list@lists.iem.at mailing list > UNSUBSCRIBE and account-management -> > https://lists.puredata.info/listinfo/pd-list > _______________________________________________ Pd-list@lists.iem.at mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list