Rca Audio noise

I have wired up my raspberry pi b+ to a RCA/Composite connection to plug into the TV all cables use a common earth and this is where i think the noise is coming from is there a simple way of removing this noise

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shabaz over 10 years ago +2

The Composite cable doesn't carry any sound information, I guess you're referring to the 3.5mm stereo jack, is that connected to the TV? You might need to lower your expectations, because inherently it…
gadget.iom over 10 years ago +2

If you want to add something to the RCA cable you could look at tone of these: http://www.amazon.co.uk/RCA-Phono-Ground-Loop-Isolator/dp/B007545XWE Though I have no idea how successful it would be.
shabaz over 10 years ago in reply to gadget.iom +2

They are often quite effective for ground loop problems, especially for car use, but I once took one apart, they use very cheapy typical iron-core transformers, so I did wonder how much distortion they…

0 gadget.iom over 10 years ago

Some people have found noise artefacts being induced by certain types of power supply. Try switching to a different power supply and see if that improves/solves your issue.
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0 gadget.iom over 10 years ago

You may also find this page generally useful:
How To Everything! - Sound distortions and the Raspberry Pi - reasons and solutions
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0 chrisdracko over 10 years ago

Was hoping I could put something in between the RCA cable ti filter and clean the signal
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0 shabaz over 10 years ago

The Composite cable doesn't carry any sound information, I guess you're referring to the 3.5mm stereo jack, is that connected to the TV?
You might need to lower your expectations, because inherently it will have some noise (it wasn't designed to be high quality, and it is in close proximity to parts on the RPI board that will cause noise on the output - nothing can be done about it), and it will be audible. Once it is in there, it can't be removed easily since it is at audible frequencies (along with your desired sounds).
Other things may be adding to it (as Paul mentions) but inherently some will always be there.
The only solution for hi-fi is a sound card, or a digital audio output (from sound card or HDMI).
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0 gadget.iom over 10 years ago

If you want to add something to the RCA cable you could look at tone of these:
http://www.amazon.co.uk/RCA-Phono-Ground-Loop-Isolator/dp/B007545XWE

Though I have no idea how successful it would be.
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0 shabaz over 10 years ago in reply to gadget.iom

They are often quite effective for ground loop problems, especially for car use, but I once took one apart, they use very cheapy typical iron-core transformers, so I did wonder how much distortion they were introducing ; ) Probably quite a lot hehe. Still, at least they eliminate the electrical whine.
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0 gadget.iom over 10 years ago in reply to shabaz

Never cracked one open.
Prefer to use balanced audio signals wherever possible.
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0 shabaz over 10 years ago in reply to gadget.iom

Me too. I was happy when I noticed my car had balanced audio signals, just wish somebody would tell the car amplifier manufacturers to stop using unbalanced phono inputs : ( It's like they want people to suffer when the phono connections inevitably loosen, etc..
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