#805 sound distorition on high volume

Mumble (544)

When someone lough or just talk loudly I hear distortion.
TeamSpeak3 with same settings sonds clear.
Sounds like Mumble needs a kind of limiter before encoding stage.
Sample attached to bug report.

Linux artstation 2.6.32-gentoo-r24
ID 0556:0001 Asahi Kasei Microsystems Co., Ltd AK5370 I/F A/D Converter (Logitech USB DesktopMic)
ID 0ccd:0028 TerraTec Electronic GmbH Aureon 5.1 MkII connected to pulse via jack2.


  • AKHmetgaleev ILdar

    This screenshot shows how Mumble distorts sound amplitude

  • Nicos Gollan

    Nicos Gollan - 2011-07-01

    That's likely a problem of overly high amplification on the sending side. In some cases, the audio wizard chooses very high settings (10-20dB gain). Try reducing that to maybe 3-4dB in the Audio Input settings.

  • AKHmetgaleev ILdar

    I set plification to 2 and have same issue.
    Anyway, even when amplitude goes out of range it should be clipped. But in mumble ti wraps around. So value 1.2 becomes -0.8. It makes very strong high frequency noise. I hear this sound distortions even in youtube videos with Mumble speeches.

  • AKHmetgaleev ILdar

    New info. I changed inbound sound volume to 90% and now I have mutch less distoritions. Seems like distorition appears not in recording side but in playback side.


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