SPDIF from Computer to ES40: high pitched noise

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mojodrums
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SPDIF from Computer to ES40: high pitched noise

Post by mojodrums » Sat Nov 09, 2019 9:41 am

Hi,

my connection is: RME Raydat (PCI Express) -> SPDIF out -> ES-40

I have a high pitched noise in the outputs of several other modules in my Eurorack, even without a direct connection between an ES-Expander and the other module. I think the noise is transferred via the power bus.
The noise disappears as soon as the SPDIF is disconnected.

One more thing I found out:
The intensity of the noise depends on the power settings of the computer.
High Performance Mode: more noise
Power Safe Mode: much less noise

I thought it might have to do with mediocre shielding vs. PC noise due to the Raydat being a PCI-Express card. But then I remembered that the same problem occured years ago with my old computer system where I used the SPDIF outputs of a RME Multiface (breakout box)

Do you have any suggestions what i could do?

Thanks in advance!

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os
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Post by os » Sat Nov 09, 2019 9:52 am

Sounds like it might be a grounding issue.

mojodrums
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Re: SPDIF from Computer to ES40: high pitched noise

Post by mojodrums » Tue Mar 10, 2020 3:15 pm

Hi OS,

yes, thats true. In the meantime I found out that this happens due to bad shielding from computer power and is a known problem on the RME forum. The solution would be to disable CPU idling - with the effect of running the CPU at full power at all times - what I'd like to avoid.

So I'm looking for another way to send the ES40 signal to the modular.

Is it possible to send the signal through a normal audio connection (XLR) and change it to SPDIF later?
Like: RME Raydat Adat Out -> D/A converter XLR Out -> Adapter from 2x XLR to 1x SPDIF?

Or something else? Basically any option that avoids using the Raydats SPDIF out.

Help is very appreciated!
Thank you.

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os
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Re: SPDIF from Computer to ES40: high pitched noise

Post by os » Wed Mar 11, 2020 3:18 am

You could convert to optical S/PDIF and back. The optical connection would give you complete electrical isolation.

mojodrums
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Re: SPDIF from Computer to ES40: high pitched noise

Post by mojodrums » Wed Mar 11, 2020 6:27 am

Hey, thanks for the reply.

So yes, I could use the forth ADAT output channel, set it to SPDIF Out in the RME settings and use something like this:
www.amazon.com/Optical-Tendak-Bi-Direct ... B06XCTGZFT
Correct?

That seams reasonable although I'd loose a full Adat port (was planning to use that for a future ES3).

Sending the signal out via two balanced mono audio outputs and solder/adapt it to the RCA plug wouldn't work?

Thanks!

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os
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Re: SPDIF from Computer to ES40: high pitched noise

Post by os » Wed Mar 11, 2020 6:35 am

No, I mean something like this:
81GswfAGa4L._AC_SL1500_.jpg
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