From: Raymond Yau <superquad.vortex2@gmail.com>
To: alsa-devel@alsa-project.org
Subject: Re: Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII
Date: Fri, 26 Feb 2010 17:38:02 +0800 [thread overview]
Message-ID: <4f3252891002260138n36994557r209f12e41c8c5ae6@mail.gmail.com> (raw)
In-Reply-To: <ad2655cb1002170555l462981cheff2b1798a14c9d0@mail.gmail.com>
2010/2/17 James Courtier-Dutton <james.dutton@gmail.com>
>
> This is a good aim, but I still think getting the correct 0dB points
> is more important to ensure the best audio quality.
> I personally think that PA should just set the hardware ALSA controls
> to 0dB and do all the volume control in software within PA.
> The 0dB points in hardware should result in the best sound quality.
>
> James
>
>
When you mix two stream of 16-bit audio and send to a 16 bit sound card ,
you have to add two 16-bit and shift right one bit ,
you have already add -3dB by software when perform soft mixing and you may
need to get +3dB gain in DAC if you want to maintain the same dB level if
one stream is actually silence
so set the hardware ALSA controls to 0dB is not that good for a sound server
next prev parent reply other threads:[~2010-02-26 9:38 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-15 19:24 Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII Lennart Poettering
2010-02-16 8:08 ` Clemens Ladisch
2010-02-16 8:24 ` Jaroslav Kysela
2010-02-16 14:32 ` Lennart Poettering
2010-02-16 14:40 ` Mark Brown
2010-02-16 15:40 ` Lennart Poettering
2010-02-16 15:49 ` Mark Brown
2010-02-16 16:29 ` Jaroslav Kysela
2010-02-16 21:07 ` Lennart Poettering
2010-02-16 22:39 ` Mark Brown
2010-02-16 22:42 ` Lennart Poettering
2010-02-16 23:38 ` Mark Brown
2010-02-16 23:56 ` Lennart Poettering
2010-02-17 11:17 ` Mark Brown
2010-02-17 13:01 ` Lennart Poettering
2010-02-17 13:15 ` Mads Kiilerich
2010-02-17 11:55 ` James Courtier-Dutton
2010-02-17 13:06 ` Mark Brown
2010-03-20 7:58 ` Raymond Yau
2010-02-18 1:48 ` Raymond Yau
2010-02-18 2:37 ` Lennart Poettering
2010-02-18 6:15 ` Raymond Yau
2010-02-18 10:11 ` James Courtier-Dutton
2010-02-18 18:13 ` Lennart Poettering
2010-02-19 8:17 ` Jaroslav Kysela
2010-02-19 9:40 ` Mark Brown
2010-02-19 10:57 ` Raymond Yau
2010-02-19 15:13 ` Lennart Poettering
2010-02-21 3:49 ` Raymond Yau
[not found] ` <20100221193933.GA31800@tango.0pointer.de>
2010-02-23 4:47 ` Raymond Yau
2010-02-23 22:20 ` Lennart Poettering
2010-02-24 1:52 ` Raymond Yau
2010-02-28 7:32 ` Raymond Yau
2010-02-23 5:12 ` Raymond Yau
2010-02-23 8:43 ` Raymond Yau
2010-02-21 4:01 ` Raymond Yau
[not found] ` <20100221192951.GD30380@tango.0pointer.de>
2010-02-23 10:08 ` Clemens Ladisch
2010-02-23 12:46 ` Raymond Yau
2010-02-23 22:32 ` Lennart Poettering
2010-02-24 0:57 ` Raymond Yau
2010-02-24 9:00 ` Clemens Ladisch
2010-02-24 11:49 ` Raymond Yau
2010-02-24 12:07 ` Raymond Yau
2010-02-24 1:12 ` Raymond Yau
2010-02-24 3:49 ` Raymond Yau
2010-02-20 8:38 ` Jaroslav Kysela
2010-02-25 3:34 ` Raymond Yau
2010-02-19 11:47 ` James Courtier-Dutton
2010-02-19 15:10 ` Lennart Poettering
2010-02-20 8:41 ` Jaroslav Kysela
2010-02-24 7:30 ` Raymond Yau
2010-02-25 13:14 ` Raymond Yau
2010-02-25 3:51 ` Raymond Yau
2010-02-26 3:17 ` Raymond Yau
2010-03-01 4:21 ` Raymond Yau
2010-02-16 23:47 ` Eliot Blennerhassett
2010-02-17 0:10 ` Lennart Poettering
2010-02-17 0:43 ` Mark Brown
2010-02-17 0:52 ` Eliot Blennerhassett
2010-02-17 11:50 ` Mark Brown
2010-02-17 9:04 ` Jaroslav Kysela
2010-02-17 12:06 ` Mark Brown
2010-02-17 13:15 ` Lennart Poettering
2010-02-17 13:32 ` Mark Brown
2010-02-17 13:06 ` Lennart Poettering
2010-02-17 13:55 ` James Courtier-Dutton
2010-02-17 14:12 ` Mark Brown
2010-02-17 14:35 ` Lennart Poettering
2010-02-17 16:17 ` James Courtier-Dutton
2010-02-26 9:38 ` Raymond Yau [this message]
2010-02-17 7:37 ` Raymond Yau
2010-02-18 2:11 ` Raymond Yau
2010-02-26 0:45 ` Raymond Yau
2010-02-20 7:24 ` Raymond Yau
2010-03-26 4:26 ` Raymond Yau
2010-02-16 21:48 ` James Courtier-Dutton
2010-02-17 8:08 ` Jaroslav Kysela
2010-06-14 3:30 ` Raymond Yau
2010-02-16 16:09 ` Jaroslav Kysela
2010-02-16 14:26 ` Lennart Poettering
2010-02-17 3:30 ` Raymond Yau
2010-02-17 15:19 ` Lennart Poettering
2010-03-08 9:06 ` Raymond Yau
2010-02-16 8:32 ` Jaroslav Kysela
2010-02-16 10:36 ` Jaroslav Kysela
2010-02-17 3:44 ` Raymond Yau
2010-02-17 12:54 ` Lennart Poettering
2010-02-26 5:18 ` Raymond Yau
2010-02-27 1:07 ` Raymond Yau
2010-03-01 0:51 ` Raymond Yau
2010-06-24 22:51 ` Raymond Yau
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