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I've got two microphones. Both work well in Windows. However, in Ubuntu the first one (call it X) works fine, but the second one (call it Y) produces a lot of high-frequency noise. I know, the best thing to do is to buy a new microphone, but X is really old and the headset is broken, Y is almost new and works fine with Windows. Is there any way to apply a low-pass filter in ALSA? I've also noticed that the sound is a little bit softened...like telephone quality input.

My soundcard is: 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02) i've got a toshiba notebook and I've just tried to edit the alsa config file adding this line: options snd-hda-intel model=auto

~ UPDATE ~ If I use arecord test.wav -f CD everything works fine.

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2 Answers 2

Reset to default
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I have just solved the problem: it is just a new kernel bug. You can solve it by using: 

options snd-hda-intel model=<your_model_or-audo> position_fix=2

In /etc/modprobe.d/alsa-base.conf

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  • Thank you very much!!! I spend two days in internet in searching about acer aspire one 532h internal microphone noise (with sound card Intel Corporation N10/ICH 7 Family High Definition Audio Controller aka Realtek 272). This fix my internal mic noises. Important: You need to adjust mic volume with the terminal alsamixer tool!!!
    – user54950
    Apr 14, 2012 at 18:05
  • worked for me on acer aspire 3. cat /proc/asound/card0/codec* | grep Codec Codec: Realtek ALC255
    – Artyom Chernetsov
    Nov 25, 2021 at 17:56
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I just had to open

alsamixer

and go to capture screen [F4] and set mic boost down, and mic record up.

enter image description here

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  • I tried it as well, capture at 100 and both boosts at 0, but for me there was still white noise.
    – sashoalm
    Jan 3, 2015 at 9:16
  • 1
    capture should be at 70.
    – Brannon
    Oct 16, 2018 at 22:03

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