[alsa-devel] [Intel HDA][ALC3226] Too much white noise from microphone
Hello ALSA devs,
I spoke to patrakov on Freenode from the #Alsa IRC channel and they mentioned that the noise background I am experiencing is not normal. I tried two different headsets, both headsets have two separate jacks, the same result.
I will test any patches/quirks for kernel as needed.
Here is the alsa-info:
http://www.alsa-project.org/db/?f=29d3c45e2d66c58be03a10bd0186067a9d735a11
Here is a 10 second recording:
Here is the amixer information:
Simple mixer control 'Master',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 87 Mono: Playback 87 [100%] [0.00dB] [on] Simple mixer control 'Headphone',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 87 Mono: Front Left: Playback 87 [100%] [0.00dB] [on] Front Right: Playback 87 [100%] [0.00dB] [on] Simple mixer control 'Speaker',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [off] Front Right: Playback [off] Simple mixer control 'Speaker+LO',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 87 Mono: Front Left: Playback 65 [75%] [-16.50dB] Front Right: Playback 65 [75%] [-16.50dB] Simple mixer control 'PCM',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 255 Mono: Front Left: Playback 255 [100%] [0.00dB] Front Right: Playback 255 [100%] [0.00dB] Simple mixer control 'Front Mic',0 Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Mono Limits: Playback 0 - 31 Mono: Capture [on] Front Left: Playback 0 [0%] [-34.50dB] [off] Front Right: Playback 0 [0%] [-34.50dB] [off] Simple mixer control 'Front Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 2 [67%] [20.00dB] Front Right: 2 [67%] [20.00dB] Simple mixer control 'Line Out',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [off] Front Right: Playback [off] Simple mixer control 'Beep',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 0 [0%] [-34.50dB] [off] Front Right: Playback 0 [0%] [-34.50dB] [off] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 63 Front Left: Capture 63 [100%] [30.00dB] [on] Front Right: Capture 63 [100%] [30.00dB] [on] Simple mixer control 'Auto-Mute Mode',0 Capabilities: enum Items: 'Disabled' 'Speaker Only' 'Line Out+Speaker' Item0: 'Line Out+Speaker' Simple mixer control 'Dock Mic',0 Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Mono Limits: Playback 0 - 31 Mono: Capture [off] Front Left: Playback 0 [0%] [-34.50dB] [off] Front Right: Playback 0 [0%] [-34.50dB] [off] Simple mixer control 'Dock Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right
05.02.2015 02:13, Shawn Starr wrote:
Hello ALSA devs,
I spoke to patrakov on Freenode from the #Alsa IRC channel and they mentioned that the noise background I am experiencing is not normal. I tried two different headsets, both headsets have two separate jacks, the same result.
I will test any patches/quirks for kernel as needed.
Here is the alsa-info:
http://www.alsa-project.org/db/?f=29d3c45e2d66c58be03a10bd0186067a9d735a11
I am not an expert on Intel HDA cards, but... some microphones are picky about the reference voltage supplied by the soundcard. You can change this temporarily, for debugging purposes, with hda-analyzer. See general instructions at
http://www.alsa-project.org/main/index.php/HDA_Analyzer
Note: it needs the "snd-hwdep" module loaded, and needs to be run as root.
In your case, you need to select Node[0x18] PIN in the left pane, and, at the bottom of the right pane, select 50 or 100 instead of 80 in the VREF box. See https://imgur.com/F84raSN for a screenshot based on your alsa-info.
If this doesn't help, just click around randomly. Maybe you'll find the magic checkbox that makes the noise go away and the voice stay :) - if that happens, please email the resulting diff file that hda-analyzer creates.
On Friday, February 06, 2015 04:48:09 PM Alexander E. Patrakov wrote:
05.02.2015 02:13, Shawn Starr wrote:
Hello ALSA devs,
I spoke to patrakov on Freenode from the #Alsa IRC channel and they mentioned that the noise background I am experiencing is not normal. I tried two different headsets, both headsets have two separate jacks, the same result.
I will test any patches/quirks for kernel as needed.
Here is the alsa-info:
http://www.alsa-project.org/db/?f=29d3c45e2d66c58be03a10bd0186067a9d735a11
I am not an expert on Intel HDA cards, but... some microphones are picky about the reference voltage supplied by the soundcard. You can change this temporarily, for debugging purposes, with hda-analyzer. See general instructions at
http://www.alsa-project.org/main/index.php/HDA_Analyzer
Note: it needs the "snd-hwdep" module loaded, and needs to be run as root.
In your case, you need to select Node[0x18] PIN in the left pane, and, at the bottom of the right pane, select 50 or 100 instead of 80 in the VREF box. See https://imgur.com/F84raSN for a screenshot based on your alsa-info.
If this doesn't help, just click around randomly. Maybe you'll find the magic checkbox that makes the noise go away and the voice stay :) - if that happens, please email the resulting diff file that hda-analyzer creates.
Hello Alexander,
Indeed, adjusting VREF to 50 cuts the background noise noticeably, it's still there but it is lesser.
Resulting 10 second audio with difference: http://turl.ca/accwc Old audio: http://turl.ca/zrhbcs
Both using same Logitech headset for test.
Thanks, Shawn
-- CUT --
Diff for codec 1/0 (0x10ec0292): --- +++ @@ -189,27 +189,27 @@ Unsolicited: tag=0x02, enabled=1 Power: setting=D0, actual=D0 Connection: 2 0x0c* 0x0d Node 0x17 [Vendor Defined Widget] wcaps 0xf00000: Mono Node 0x18 [Pin Complex] wcaps 0x40058f: Stereo Amp-In Amp-Out Control: name="Front Mic Boost Volume", index=0, device=0 ControlAmp: chs=3, dir=1, idx=0, ofs=0 - Control: name="Front Mic Jack", index=0, device=0 + Control: iface="card", name="Front Mic Jack", index=0, device=0 Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0 Amp-In vals: [0x01 0x01] Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1 Amp-Out vals: [0x80 0x80] Pincap 0x00003734: IN OUT Detect Vref caps: HIZ 50 GRD 80 100 Pin Default 0x02a19031: [Jack] Mic at Ext Front Conn = 1/8, Color = Pink DefAssociation = 0x3, Sequence = 0x1 - Pin-ctls: 0x24: IN VREF_80 + Pin-ctls: 0x21: IN VREF_50 Unsolicited: tag=0x03, enabled=1 Power: setting=D0, actual=D0 Connection: 2 0x0c* 0x0d Node 0x19 [Pin Complex] wcaps 0x40048b: Stereo Amp-In Control: name="Dock Mic Boost Volume", index=0, device=0 ControlAmp: chs=3, dir=1, idx=0, ofs=0 Control: name="Dock Mic Jack", index=0, device=
06.02.2015 20:22, Shawn Starr wrote:
http://www.alsa-project.org/db/?f=29d3c45e2d66c58be03a10bd0186067a9d735a11
Hello Alexander,
Indeed, adjusting VREF to 50 cuts the background noise noticeably, it's still there but it is lesser.
The voice also becomes more quiet, but the SNR indeed improves. Although I'd still consider the situation as too noisy.
So, the original request stands.
On Fri, Feb 6, 2015 at 11:48 AM, Alexander E. Patrakov patrakov@gmail.com wrote:
Ah, i wasn't aware of this tool and I have a HDA in my laptop...
If this doesn't help, just click around randomly. Maybe you'll find the magic checkbox that makes the noise go away and the voice stay :)
No luck yet, played with the internal mic, which is very noise and SNR is much too high to be usable. Setting vref to 50 gives the best SNR, still not usable though.
Changing the "digital" capture level in alsamixer changes the level of the internal mic signal - is this expected? I looked for the "digital" capture level control in HDAAnalyzer, but couldn't find it - vendor defined?
Cheers, -Harry
07.02.2015 16:12, Harry van Haaren пишет:
On Fri, Feb 6, 2015 at 11:48 AM, Alexander E. Patrakov patrakov@gmail.com wrote:
Ah, i wasn't aware of this tool and I have a HDA in my laptop...
If this doesn't help, just click around randomly. Maybe you'll find the magic checkbox that makes the noise go away and the voice stay :)
No luck yet, played with the internal mic, which is very noise and SNR is much too high to be usable. Setting vref to 50 gives the best SNR, still not usable though.
Changing the "digital" capture level in alsamixer changes the level of the internal mic signal - is this expected? I looked for the "digital" capture level control in HDAAnalyzer, but couldn't find it - vendor defined?
"digital" capture level is similar to the fake digital zoom found in some cheap cameras and phones. It is a software-only feature, and does not exist in any of the widgets. Please don't use it, i.e. set it to 0 dB.
participants (3)
-
Alexander E. Patrakov -
Harry van Haaren -
Shawn Starr