Static noise with microphone

[Polytropon]

On Fri, 5 Jan 2018 02:43:22 +0800, blubee blubeeme wrote:
> On Fri, Jan 5, 2018 at 2:35 AM, Per Gunnarsson via freebsd-questions <
> freebsd-questions at freebsd.org> wrote:
> 
> > Hello!
> >
> > I have attached a microphone (a Mico from Trust) to the mic in on my
> > computer, and it produces some static noise. It's not connected to the USB
> > port.
> >
> > Is this just hardware related or is there anything I can change in the
> > software to get rid of it?
> >
> > You can hear the noise here:
> >
> > http://mustafejen.se:8000/stream.ogg
> >
> > I found this in my dmesg:
> >
> > hdac0: <NVIDIA (0x0e0f) HDA Controller> mem 0xfe080000-0xfe083fff at
> > device 0.1 on pci3
> > hdac1: <AMD (0x157a) HDA Controller> mem 0xfe500000-0xfe503fff at device
> > 9.2 on pci0
> > hdacc0: <NVIDIA (0x0051) HDA CODEC> at cad 0 on hdac0
> > hdaa0: <NVIDIA (0x0051) Audio Function Group> at nid 1 on hdacc0
> > pcm0: <NVIDIA (0x0051) (HDMI/DP 8ch)> at nid 5 on hdaa0
> > hdacc1: <Realtek ALC662 HDA CODEC> at cad 0 on hdac1
> > hdaa1: <Realtek ALC662 Audio Function Group> at nid 1 on hdacc1
> > pcm1: <Realtek ALC662 (Analog 2.0+HP/2.0)> at nid 20,27 and 24,26 on hdaa1
> > pcm2: <Realtek ALC662 (Analog)> at nid 21 and 25 on hdaa1
> >
> > [per at konjak ~]$ mixer
> > Mixer vol      is currently set to  85:85
> > Mixer pcm      is currently set to 100:100
> > Mixer speaker  is currently set to  74:74
> > Mixer line     is currently set to   1:1
> > Mixer mic      is currently set to  90:90
> > Mixer mix      is currently set to  74:74
> > Mixer rec      is currently set to  85:85
> > Mixer igain    is currently set to 100:100
> > Mixer ogain    is currently set to 100:100
> > Recording source: mic
> >
> > Regards,
> >
> > Per Gunnarsson
> >
> >
> >
> >
> >
> > _______________________________________________
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> >
> > This could be any number of issues.
> 
> 1) How's the ambient noise in your recording environment?
> 2) Could be electronic noise from computer components [Is it a laptop or
> desktop]
> 3) The mic could have a very low noise floor, are u doing any filtering?
> 4) Have you tried any other mic to see if it's the same?
> 
> another thing, looking at your hdaa settings did you configure ur pin into
> associations and groups?
> That pinout looks a bit random.

Also check for possible settings in other mixers (you probably
have more than one):

	% mixer -f /dev/mixer0
	% mixer -f /dev/mixer1
	% mixer -f /dev/mixer2
	...

Maybe the noise you're hearing is some amplified "interference"
coming through a monitor channel; look for "monitor", "igain",
"ogain". With a graphical mixer like xmixer or aumix-gtk, you
can easily check the effects of those settings.





-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...