edmundodantes1
Posts: 2
Joined: Wed Mar 11, 2015 10:54 pm

Noise or interference in analog output

Fri Mar 13, 2015 12:56 pm

Hello.

I've had a Raspberry Pi 2 for a few days. It is connected to the TV with HDMI, but I want to use audio system in analog output. I configure audio in OpenELEC in analog mode. But, when I play music or watch a video, there is a quite annoying background noise, as interference, which only attenuates if I turn the volume up.

It isn't a speaker problem because I've got the same problem with the headphones. The noise or interference it's only heard when the speakers are emitting a sound. In fact, the sound of the menu also has interference. The HDMI sound is fine , but I'm interested in analog output.

I've been looking for a solution for a couple or days, but I haven't found a solution. I've even tried to install a ferrite filter in the power cord , but it hasn't worked.

Have you got any idea of which could be the problem? Thank you very much

Tosselino
Posts: 2
Joined: Wed Mar 18, 2015 9:42 am

Re: Noise or interference in analog output

Wed Mar 18, 2015 9:44 am

Hi,
I have the exact same issue. But no solution. Have you tryed any other SW? I think this is related to the actual HW, but would be interesting to check any other SW/OS.

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yv1hx
Posts: 373
Joined: Sat Jul 21, 2012 10:09 pm
Location: Zulia, Venezuela
Contact: Website

Re: Noise or interference in analog output

Mon Mar 23, 2015 8:00 pm

edmundodantes1 wrote:Hello.

I've had a Raspberry Pi 2 for a few days. It is connected to the TV with HDMI, but I want to use audio system in analog output. I configure audio in OpenELEC in analog mode. But, when I play music or watch a video, there is a quite annoying background noise, as interference, which only attenuates if I turn the volume up.

It isn't a speaker problem because I've got the same problem with the headphones. The noise or interference it's only heard when the speakers are emitting a sound. In fact, the sound of the menu also has interference. The HDMI sound is fine , but I'm interested in analog output.

I've been looking for a solution for a couple or days, but I haven't found a solution. I've even tried to install a ferrite filter in the power cord , but it hasn't worked.

Have you got any idea of which could be the problem? Thank you very much
Main AC hum maybe? http://en.wikipedia.org/wiki/Mains_hum
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Tosselino
Posts: 2
Joined: Wed Mar 18, 2015 9:42 am

Re: Noise or interference in analog output

Tue Mar 24, 2015 8:04 am

In my case I think it was a grounding issue. When I connected the 3.5 mm analog output of the RPi to a stereo amplifier (using RCA) instead of using headphones the strange noise was gone.

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yv1hx
Posts: 373
Joined: Sat Jul 21, 2012 10:09 pm
Location: Zulia, Venezuela
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Re: Noise or interference in analog output

Tue Mar 24, 2015 2:11 pm

Tosselino wrote:In my case I think it was a grounding issue. When I connected the 3.5 mm analog output of the RPi to a stereo amplifier (using RCA) instead of using headphones the strange noise was gone.
How are you powering your RasberryPi?
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