From: Raymond Yau <superquad.vortex2@gmail.com>
To: ALSA Development Mailing List <alsa-devel@alsa-project.org>
Subject: Re: Mixer volume/decibel mapping
Date: Wed, 26 May 2010 07:00:22 +0800 [thread overview]
Message-ID: <AANLkTim77m6JMHSGCGJUN2h-3_Gsv7v7Afu7sbmhaK5_@mail.gmail.com> (raw)
In-Reply-To: <4BFBE056.9000706@ladisch.de>
2010/5/25 Clemens Ladisch <clemens@ladisch.de>
> Raymond Yau wrote:
> > I have doubt about DECLARE_TLV_DB_LINEAR(ak4396_db_scale,
> TLV_DB_GAIN_MUTE, 0);
> >
> > since the datasheet mention that dB range is only -48dB to 0dB
> >
> > ATT = 20 log10 (ATT_DATA / 255) [dB]
> >
> > How can AK4396 has scale of -inf DB to 0dB in the driver code ?
>
> When ATT_DATA = 0, there is no output, which is an attenuation of -inf.
> The next value, ATT_DATA = 1, results in ATT = -48 dB.
>
But snd_mixer_selem_get_playback_dB_range() does not return 48dB
**
next prev parent reply other threads:[~2010-05-25 23:00 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-19 16:34 Mixer volume/decibel mapping Sebastian H.
2010-05-20 7:34 ` Clemens Ladisch
2010-05-20 8:01 ` James Courtier-Dutton
2010-05-20 8:53 ` Raymond Yau
2010-05-20 9:41 ` Sebastian H.
2010-05-20 16:13 ` James Courtier-Dutton
2010-05-21 0:35 ` Raymond Yau
2010-05-21 1:30 ` Raymond Yau
2010-05-21 8:18 ` Sebastian H.
2010-06-07 3:37 ` Raymond Yau
2010-06-07 9:19 ` Sebastian H.
2010-06-08 1:03 ` Raymond Yau
2010-06-08 6:02 ` Sebastian Holtermann
2010-06-08 15:31 ` Raymond Yau
2010-06-09 10:26 ` Sebastian H.
2010-06-08 6:08 ` Sebastian H.
2010-06-09 5:39 ` Raymond Yau
2010-06-09 7:34 ` Sebastian H.
2010-06-10 0:08 ` Raymond Yau
2010-06-09 5:55 ` Raymond Yau
2010-06-08 2:23 ` Raymond Yau
2010-05-21 6:35 ` Clemens Ladisch
2010-05-21 6:51 ` Peter Ujfalusi
2010-05-21 9:56 ` Clemens Ladisch
2010-05-24 2:52 ` Raymond Yau
2010-05-25 8:38 ` Clemens Ladisch
2010-05-25 8:43 ` James Courtier-Dutton
2010-05-25 8:49 ` Clemens Ladisch
2010-05-25 23:24 ` Raymond Yau
2010-05-27 13:32 ` Colin Guthrie
2010-05-29 3:54 ` Raymond Yau
2010-05-29 1:57 ` Raymond Yau
2010-05-29 18:46 ` Colin Guthrie
2010-06-04 23:46 ` Raymond Yau
[not found] ` <AANLkTik7mD1DAVWkOwM7sNu0EfgGApvzX9WRXWBOO4PI@mail.gmail.com>
2010-05-25 8:45 ` Clemens Ladisch
2010-05-25 13:51 ` Raymond Yau
2010-05-25 14:36 ` Clemens Ladisch
2010-05-25 23:00 ` Raymond Yau [this message]
2010-05-27 0:20 ` Raymond Yau
2010-05-28 13:04 ` Raymond Yau
2010-05-28 14:10 ` Clemens Ladisch
2010-05-29 1:31 ` Raymond Yau
2010-05-21 13:16 ` James Courtier-Dutton
2010-05-25 8:21 ` Clemens Ladisch
2010-06-09 6:19 ` Raymond Yau
2010-05-22 9:24 ` Raymond Yau
2010-05-20 9:20 ` Sebastian H.
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