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Dongle emitting high pitched sound. Seems to be related to buffer size??
I've just noticed that the dongle I use to charge and connect my Ipad with the peripherals emits a high pitched noise when connected to the power outlet.
However, I also noticed that the noise vanished as soon as I quit Loopy Pro. So I decided to check if there was something going on in Loopy that I could change. Funnily enough, at higher buffer sizes the noise dissappears. The more you lower the buffer below 256, the more noticeable the noise gets. Anyone else experienced this kind of issue?
Setup is an M4 Ipad Pro and a Ugreen USB C dongle with power delivery of up to 100W...
Comments
What all is connected to the hub?
What are you using for audio input and output?
Well, my audio interface to start with, a midi foot controller, a midi twister and midi keyboard.
Audio is from a vocal Mic and Violin/Guitar via a Kemper Amp, both connected to an RME interface...
I think this happened to me to recently. Apple CCK. Using R4 Mixerface for vocals and guitar. Audio out through the interface. BlueBoard connected.
If it only happens when connected to the power outlet and it's a high-pitched (i.e., > 10 kHz or so) noise, it's almost certainly the switch-mode power supply (you didn't specify what model exactly you're using). If so, it's intrinsic to how the power supply operates and there's nothing you can do. Your decreasing the buffer size making the sound worse makes sense, as this would increase CPU use and thus power use, which would make the noise worse (as the SMPS needs to convert more power, thus "works harder").
Quick test: Do any OTHER cpu-intensive tasks (non-audio-related) running on the iPad ALSO generate that noise?
If you mute the inputs, do you hear the whine?
might be the USB cable thats providing the power catching interference?
You say the dongle itself is emitting the noise? As-in you can audibly hear a sound coming directly from the dongle, like you might hear a tuning fork vibrate or something?
Hi everyone, thanks for your input!
Yes, the whine is not really audible within Loopy. Its the dongle itself emitting the noise. As @wim says.
Yeah, I'm pretty sure this is correct. By now, I've read a couple of other threads where people have had similar issues with dongles. I'll have to try out with another brand...
Unfortunately not, I tried with a couple of different high quality cables...
Ahh. I misinterpreted the situation.
OK. In general: the higher the price, the less likely the noise issues, as higher switching frequencies (which above ~ 20 kHz become inaudible) require more expensive components.
(maybe as a fun datapoint: This is the "2025 version" of what USED to be the "Mains Hum" problem 😊 technology has changed, the annoyingness of its emissions hasn't...)