From: Rene Herman <rene.herman@keyaccess.nl>
To: Takashi Iwai <tiwai@suse.de>
Cc: alsa-devel@alsa-project.org, Lennart Poettering <mznyfn@0pointer.de>
Subject: Re: What does 0dB refer to? (Logitech USB Speakers)
Date: Mon, 21 Apr 2008 19:10:51 +0200 [thread overview]
Message-ID: <480CCA9B.9030500@keyaccess.nl> (raw)
In-Reply-To: <s5hfxtfcoza.wl%tiwai@suse.de>
On 21-04-08 15:32, Takashi Iwai wrote:
> At Sun, 20 Apr 2008 02:00:51 +0200,
> Lennart Poettering wrote:
>> My understanding is that the dB values of this USB device are relative
>> to its maximum gain, and as such consistent in itself. Does the USB
>> spec define the reference level for the dB values?
>
> Not clearly. IIRC, it's against the line level...
The 1.0 spec calls 0 dB line level indeed and (at least in the context of
the dynamic range compressor, section 3.5.6.6) suggests that it's "usually
15-20 dB below the maximum level".
Rene.
prev parent reply other threads:[~2008-04-21 17:10 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-11 20:46 What does 0dB refer to? (Logitech USB Speakers) Lennart Poettering
2008-04-12 0:09 ` Mark Brown
2008-04-12 7:27 ` John Rigg
2008-04-12 11:15 ` James Courtier-Dutton
2008-04-12 12:01 ` John Rigg
2008-04-12 13:16 ` Lennart Poettering
2008-04-12 13:35 ` Lennart Poettering
2008-04-12 18:14 ` James Courtier-Dutton
2008-04-12 18:25 ` Florian Faber
2008-04-12 19:26 ` James Courtier-Dutton
2008-04-12 19:34 ` James Courtier-Dutton
2008-04-12 19:37 ` Rene Herman
2008-04-14 16:48 ` Lennart Poettering
2008-04-14 17:00 ` Rene Herman
2008-04-14 17:24 ` Lennart Poettering
2008-04-14 22:47 ` Rene Herman
2008-04-14 23:57 ` Lennart Poettering
2008-04-15 1:04 ` Rene Herman
2008-04-15 4:09 ` Florian Faber
2008-04-15 17:02 ` Rene Herman
2008-04-12 21:41 ` John Rigg
2008-04-12 21:55 ` James Courtier-Dutton
2008-04-12 22:09 ` Rene Herman
2008-04-12 22:23 ` Rene Herman
2008-04-14 16:58 ` Lennart Poettering
2008-04-14 17:28 ` Rene Herman
2008-04-12 22:43 ` John Rigg
2008-04-13 12:36 ` Alexander E. Patrakov
2008-04-14 16:56 ` Lennart Poettering
2008-04-14 16:50 ` Lennart Poettering
2008-04-15 15:03 ` Wolfgang Woehl
2008-04-12 21:14 ` John Rigg
2008-04-12 21:54 ` stan
2008-04-12 23:00 ` John Rigg
2008-04-12 23:24 ` Lee Revell
2008-04-13 10:51 ` James Courtier-Dutton
2008-04-13 11:26 ` Florian Faber
2008-04-13 12:09 ` James Courtier-Dutton
2008-04-13 11:52 ` Rene Herman
2008-04-13 15:17 ` stan
2008-04-13 16:28 ` Rene Herman
2008-04-14 16:40 ` Lennart Poettering
2008-04-12 19:32 ` Rene Herman
2008-04-12 21:16 ` Rene Herman
2008-04-13 17:48 ` Mark Brown
2008-04-14 17:00 ` Lennart Poettering
2008-04-14 17:22 ` Rene Herman
2008-04-14 17:28 ` Lennart Poettering
2008-04-14 21:07 ` James Courtier-Dutton
2008-04-14 22:08 ` Aldrin Martoq
2008-04-14 23:43 ` Lennart Poettering
2008-04-14 23:54 ` Lee Revell
2008-04-15 2:18 ` Aldrin Martoq
2008-04-15 3:52 ` Florian Faber
2008-04-15 12:32 ` John Rigg
2008-04-15 13:12 ` John Rigg
2008-04-15 14:33 ` Rene Herman
2008-04-16 14:29 ` Rene Herman
2008-04-16 15:19 ` Rene Herman
2008-04-16 15:37 ` Rene Herman
2008-04-17 20:39 ` James Courtier-Dutton
2008-04-17 21:30 ` Rene Herman
2008-06-09 23:37 ` Rene Herman
2008-04-15 14:43 ` James Courtier-Dutton
2008-04-15 16:55 ` John Rigg
2008-04-15 15:42 ` Wolfgang Woehl
2008-04-15 15:51 ` Rene Herman
2008-04-15 16:41 ` John Rigg
2008-04-15 17:14 ` Wolfgang Woehl
2008-04-15 17:50 ` John Rigg
2008-04-20 1:01 ` Lennart Poettering
2008-04-20 15:23 ` stan
2008-04-21 3:20 ` Alexander E. Patrakov
2008-04-21 13:43 ` Takashi Iwai
2008-04-21 15:25 ` Rene Herman
2008-04-21 16:01 ` Jaroslav Kysela
2008-04-21 16:06 ` Takashi Iwai
2008-04-21 16:09 ` Jaroslav Kysela
2008-04-21 16:17 ` Takashi Iwai
2008-04-15 10:17 ` Takashi Iwai
2008-04-20 0:00 ` Lennart Poettering
2008-04-21 13:32 ` Takashi Iwai
2008-04-21 17:10 ` Rene Herman [this message]
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