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
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.
