Help to identify buzzing noise.

[ba10s118]

Hello guys!

In my dedicated streaming setup, I get this buzzing noise.

 

After a quick look, I'm quiet sure that it's a 50khz buzzing? (please correct me if I'm wrong?)
Here's a audio sample (bare in mind, I turn up the volume at the end) :
puu.sh/b4sMF/e77ce828cd.mp3

It's a quiet annoying background noise, considering how much I've spent on the system.
But since it's at that high a frequency, will I be able to exclude ground loop issue?

This is how my setup is:


Any ideas what this annoying noise is ?

[VMaxMuffin]

Try unplugging one cable at a time and see if the noise goes away. Likely an audio cable somewhere...

[ba10s118]

When I remove the usb from my main PC, the buzzing slightly decreases. (usb to the mixer) But I can't go without that cable.
I've tried another new cable, still same issue.

[ba10s118]

Really? No-one else know about this issue?

[ShearMe]

Get an RCA ground loop isolator just to be sure because they're pretty cheap. If it doesn't solve the problem, it's still useful to have.

 

Will have to point my finger at the Behringer mixer or Elgato audio input if it's not a ground loop.

[ba10s118]

I've ordered a ARC DTI and some better audio cables, but if I had ground loop issue, wouldn't i see 60hz buzzing instead of 50khz ?

[ShearMe]

I've ordered a ARC DTI and some better audio cables, but if I had ground loop issue, wouldn't i see 60hz buzzing instead of 50khz ?

 

Not necessarily. 60Hz is A/C power from the wall, but there's no telling what Hz various electronics produce that a ground loop could sneak into the signal. I know I had a high pitched background hiss with a previously owned setup until I used Optical between the PC and DAC.

[ba10s118]

Not necessarily. 60Hz is A/C power from the wall, but there's no telling what Hz various electronics produce that a ground loop could sneak into the signal. I know I had a high pitched background hiss with a previously owned setup until I used Optical between the PC and DAC.

Oh THATS good to hear, because as far as i could read, then was ground loop only 60hz.. This gives me hope... Let's see monday when the ARC DTI arrives.

But thanks for the reply mate! I will replay back once the isolator is in the house and tested.

[ba10s118]

Wait a minute!



As shown in the picture above, aproximate 50khz, which is equal to the quality setting..

[Cheesebaron]

You won't be able to hear 50 kHz, however 50 Hz is audible. Human hearing goes to around 20 kHz...

 

48000 Hz is just the sampling rate.

[ba10s118]

You won't be able to hear 50 kHz, however 50 Hz is audible. Human hearing goes to around 20 kHz...

 

48000 Hz is just the sampling rate.

Yeah I know that - BUT I hear a buzzing noise, and when I look at the spectrum, I see a 50khz noise.

 

[Cheesebaron]

Which isn't audible. Usually buzzing, which is not high pitched is around 50 or 60 Hz, which is often due to grounding issues.

 

You won't be able to hear 50 kHz...

[ba10s118]

Which isn't audible. Usually buzzing, which is not high pitched is around 50 or 60 Hz, which is often due to grounding issues.

 

You won't be able to hear 50 kHz...

As I said, I know I'm not able to hear 50 kHz, but I'm just showing my findings here.

I dissable ALL audio, record, hear the buzzing, and I just present the findings.

But here's the horible sucker:

http://puu.sh/b5aTG/d7877693cb.mp3

[Cheesebaron]

That sound is over 1000 Hz, a bit hard to approximate it exactly, but I would think around 1300 Hz. That sound is very typical on laptops or similar with bad sound cards when it is doing intensive work. Could also be a fan or some other noisy component in the computer.

 

But first I would try to find out where exactly the source of the noise comes from. If it is your PC or your mixer, or some other component you plug in.

[ba10s118]

I found the solution to the problem.
It involved several steps.

1- Better cables (did major improvement)
2- Used GOOD quality ground loop isolator ( art dti, connected to ground )
3- Used external usb soundcard instead of elgato gamecapture HD (behringer uca20e)