audio usb record and play with strange background noise
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Hi all
I made the following test using two different Omega2 Pro:
- Installed the Alsa packages
- Connect a usb headset with microphone
- Record my voice using different frequencies. I used from 8kHz to 44Khz (arecord command)
- Play the wav generated files of the previous step (aplay command)
In both omegas I obtained the same result: a strange background noise. The noise is regular.
The same headset has been tested in another linux machine without any problem. It's quite a good headset.
Any suggestion?
Thank you
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@Joan-Iglesias If you play the wav on some other device, such as a computer, is the background noise present? I think it is important to understand if the background noise is in the recording or the playback.
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@crispyoz If I do the same in my Linux computer everything works fine. When I do the mentioned steps in Omega, it appears this strange background noise.
Thank you
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@Joan-Iglesias My question was, if you record the audio on the Omega, then transfer the wav file to your linux computer and play it on your liux computer, does the recording have the background noise?
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@crispyoz Yes, it has it.
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@crispyoz I would like to add more information. I'm using a mono headset with microphone.
The headset has USB connector, that I directly connect to the USB of the Omega 2 Pro.
I could see in the forum, that some users have used a USB sound card. The USB sound card, probably had a jack 3.5 for audio input and output.
Maybe using a USB sound card the background noise could disappear. What do you think?
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@Joan-Iglesias I suspect the issue is power related, but I may be wrong. If you connect your USB headset and microphone to a powered USB hub which is also connected to your Omega, this could help determine if this is the issue.
How are you powering your Omega?
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@crispyoz I'm powering the Omega with a USB cable connected to my Linux PC.
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@Joan-Iglesias do you have powered USB hub to try? Or external power supply for Omega?
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@crispyoz I powered the Omega 2 Pro with a power supply (not PC), but still the same problem. If I can, I will get a usb sound card, to check if the problem disappear.
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@crispyoz More information: when audio is recorded in PC and played in Omega, it works fine. When audio is recorded using Omega and played in PC: background noise appear.
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Tested with a jack 3.5 to USB adapter + headset with microphone and jack 3.5 connection: it works much better. Some background noise can be listened, but nothing very important.
I suppose, with the right headset, sound would be event much better.