* Decibel Levels for Storm Medusa 5.1 USB Headset @ 2013-07-22 20:05 Alexander Blinne 2013-07-25 8:40 ` Takashi Iwai 0 siblings, 1 reply; 5+ messages in thread From: Alexander Blinne @ 2013-07-22 20:05 UTC (permalink / raw) To: alsa-devel [-- Attachment #1.1: Type: text/plain, Size: 432 bytes --] Hello everyone, I hope this Information helps. I have the Storm Medusa 5.1 USB Headset which reports wrong decibel levels to pulseaudio. My Alsa-Info are located at http://www.alsa-project.org/db/?f=a882f3db6769c5dfce83c266946eff52d1d55349 The Headset is card2 in the above dump. My decibel levels-fix [DecibelFix Speaker] db-values = 1:-30 37:3 works fine. Level 0 is mute, hence -infinity dB. Greetings [-- Attachment #1.2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 263 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Decibel Levels for Storm Medusa 5.1 USB Headset 2013-07-22 20:05 Decibel Levels for Storm Medusa 5.1 USB Headset Alexander Blinne @ 2013-07-25 8:40 ` Takashi Iwai 2013-07-25 22:01 ` Alexander Blinne 2013-07-26 12:45 ` Raymond Yau 0 siblings, 2 replies; 5+ messages in thread From: Takashi Iwai @ 2013-07-25 8:40 UTC (permalink / raw) To: Alexander Blinne; +Cc: alsa-devel At Mon, 22 Jul 2013 22:05:14 +0200, Alexander Blinne wrote: > > Hello everyone, > > I hope this Information helps. I have the Storm Medusa 5.1 USB Headset > which reports wrong decibel levels to pulseaudio. My Alsa-Info are > located at > > http://www.alsa-project.org/db/?f=a882f3db6769c5dfce83c266946eff52d1d55349 > > The Headset is card2 in the above dump. > > My decibel levels-fix > > [DecibelFix Speaker] > db-values = 1:-30 37:3 How did you define these values? Takashi > > works fine. Level 0 is mute, hence -infinity dB. > > Greetings > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Decibel Levels for Storm Medusa 5.1 USB Headset 2013-07-25 8:40 ` Takashi Iwai @ 2013-07-25 22:01 ` Alexander Blinne 2013-07-26 12:45 ` Raymond Yau 1 sibling, 0 replies; 5+ messages in thread From: Alexander Blinne @ 2013-07-25 22:01 UTC (permalink / raw) To: Takashi Iwai; +Cc: alsa-devel [-- Attachment #1.1: Type: text/plain, Size: 1033 bytes --] Hello, well I have to admit that those level were just a guess. I have now made an accurate measurement of the real volume levels by playing back white noise through the headset and recording with a microphone at the same time, while increasing the hardware volume level with 'amixer'. Then i have measured the volumes with audacity's contrast-analyzer and smoothed the resulting curve by applying a nonlinear least squares fit with a function a*log(x+d*x^2+e*x^3)+b+c*x, wich fits the data really well. The resulting levels are: 0 invalid/unconclusive, sometimes mute, sometimes louder than 1. seems not to be working correctly. 1 -24,91 2 -22,31 3 -20,10 4 -18,15 5 -16,46 6 -15,00 7 -13,73 8 -12,61 9 -11,62 10 -10,72 11 -9,91 12 -9,17 13 -8,49 14 -7,87 15 -7,28 16 -6,74 17 -6,23 18 -5,75 19 -5,30 20 -4,88 21 -4,48 22 -4,09 23 -3,73 24 -3,38 25 -3,05 26 -2,74 27 -2,44 28 -2,15 29 -1,87 30 -1,61 31 -1,35 32 -1,10 33 -0,87 34 -0,64 35 -0,42 36 -0,21 37 0,00 Alex [-- Attachment #1.2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 263 bytes --] [-- Attachment #2: Type: text/plain, Size: 0 bytes --] ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Decibel Levels for Storm Medusa 5.1 USB Headset 2013-07-25 8:40 ` Takashi Iwai 2013-07-25 22:01 ` Alexander Blinne @ 2013-07-26 12:45 ` Raymond Yau [not found] ` <51F2954C.3010202@gmx.at> 1 sibling, 1 reply; 5+ messages in thread From: Raymond Yau @ 2013-07-26 12:45 UTC (permalink / raw) To: Takashi Iwai; +Cc: alsa-devel, Alexander Blinne > > > > I hope this Information helps. I have the Storm Medusa 5.1 USB Headset > > which reports wrong decibel levels to pulseaudio. My Alsa-Info are > > located at > > > > http://www.alsa-project.org/db/?f=a882f3db6769c5dfce83c266946eff52d1d55349 > > > > The Headset is card2 in the above dump. > > > > My decibel levels-fix > > > > [DecibelFix Speaker] > > db-values = 1:-30 37:3 > > How did you define these values? http://mailman.alsa-project.org/pipermail/alsa-devel/2007-November/003867.html If your headset have windows driver, need to find out which USB chip and look at the datasheet of the chip e.g. cm106l ’s datasheet contain a table of dac volume cortol _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel ^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <51F2954C.3010202@gmx.at>]
* Re: Decibel Levels for Storm Medusa 5.1 USB Headset [not found] ` <51F2954C.3010202@gmx.at> @ 2013-07-26 23:30 ` Raymond Yau 0 siblings, 0 replies; 5+ messages in thread From: Raymond Yau @ 2013-07-26 23:30 UTC (permalink / raw) To: Ulrich Günther, alsa-devel, tiwai, alexander.blinne > >>> I hope this Information helps. I have the Storm Medusa 5.1 USB Headset > >>> which reports wrong decibel levels to pulseaudio. My Alsa-Info are > >>> located at > >>> > >>> > > http://www.alsa-project.org/db/?f=a882f3db6769c5dfce83c266946eff52d1d55349 > >>> The Headset is card2 in the above dump. > >>> > >>> My decibel levels-fix > >>> > >>> [DecibelFix Speaker] > >>> db-values = 1:-30 37:3 > >> How did you define these values? > > http://mailman.alsa-project.org/pipermail/alsa-devel/2007-November/003867.html > > > > If your headset have windows driver, need to find out which USB chip and > > look at the datasheet of the chip > > > > e.g. cm106l ’s datasheet contain a table of dac volume cortol > Ok looks like cm6206 is only in newer versions of the headset in older > (like mine) there is cm106l , maybe there are other chips as well but i > don't know. http://mailman.alsa-project.org/pipermail/alsa-devel/2007-November/003877.html Seem same USB audio id idVendor 0x0d8c C-Media Electronics, Inc. idProduct 0x0006 Do you find out the audio chip from product spec, user manual or windows driver ? Master volume control by default; per-channel volume control by C-Media driver Refer to the function block diagram , dac with volume controls 0 to -45dB There is a table of dac volume control in linear scale _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel ^ permalink raw reply [flat|nested] 5+ messages in thread
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2013-07-22 20:05 Decibel Levels for Storm Medusa 5.1 USB Headset Alexander Blinne
2013-07-25 8:40 ` Takashi Iwai
2013-07-25 22:01 ` Alexander Blinne
2013-07-26 12:45 ` Raymond Yau
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2013-07-26 23:30 ` Raymond Yau
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