I have been using Sonic Pi recently and have been annoyed by a persistent stream of white noise. This has happened on both Raspbian and Ubuntu MATE 16.04 for Raspberry Pi, using SENNHEISER MX356s. Is there any way to stop this?
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2There have been a lot of observations made here that the Pi's audio, particularly through the 3.5mm jack, is not great, and subject to various kinds of interference and noise. – goldilocks♦ Apr 5 '17 at 18:34
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I'm using a PiCamera and a Button on GPIO 21 – R Harrington Apr 5 '17 at 18:44
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2I think it applies regardless of what you have connected. It's just a crappy audio system that's not properly isolated. If someone asked me, "Is this a good thing to buy if I want to use it primary to play music?", I'd say no. – goldilocks♦ Apr 5 '17 at 18:47
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Per the comments below the question, the Pi's 3.5mm audio output is not a good output. I try to avoid it where possible. I have yet to see a convincing writeup of any approaches which would eliminate the noise from the analogue jack sufficiently for it to be used for enjoying music.
Your options for usable audio are:
- An HDMI to analogue converter with analogue output jack such as this one by Tendak
- An i2s based audio card such as the HiFiBerry or Pi-DAC+
- A USB soundcard such as this one from Adafruit
I've tested a few variations on each of these approaches, and they all seem to work fine.
The question is a bit old, but nevertheless: Add
audio_pwm_mode=2
to /boot/config.txt
(Source: https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=136445, worked with my pi)
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No difference at all on a Pi 3 B+ Presumably this is caused by poor grounding. eg there is no grounding on the pi. – John Hunt Apr 20 '20 at 10:14
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Didn't make any difference for me either. Is there any way to ground the pi? – Joe Strout Jul 12 at 2:14
I moved the USB connector from adapter to RPI USB port. The 50Hz sound disappeared. This works for 5V powered audio. Some countries use 60Hz power supply.
Moving the speaker's USB power cable from the Pi's USB port to an external power brick worked for me
