From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lennart Poettering Subject: Re: What does 0dB refer to? (Logitech USB Speakers) Date: Mon, 14 Apr 2008 19:28:39 +0200 Message-ID: <20080414172839.GA26513@tango.0pointer.de> References: <20080411204610.GA32413@tango.0pointer.de> <480099C6.3040708@superbug.co.uk> <20080412133536.GC32491@tango.0pointer.de> <48010E62.2020404@keyaccess.nl> <20080414170022.GH22115@tango.0pointer.de> <480392F3.9030701@keyaccess.nl> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from tango.0pointer.de (tango.0pointer.de [85.214.72.216]) by alsa0.perex.cz (Postfix) with ESMTP id 067B024465 for ; Mon, 14 Apr 2008 19:28:40 +0200 (CEST) Content-Disposition: inline In-Reply-To: <480392F3.9030701@keyaccess.nl> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On Mon, 14.04.08 19:22, Rene Herman (rene.herman@keyaccess.nl) wrote: > > On 14-04-08 19:00, Lennart Poettering wrote: > > > On Sat, 12.04.08 21:32, Rene Herman (rene.herman@keyaccess.nl) wrote: > > >> If we add in ISA cards, it's not a very generic assumption at least. For > >> example on my cs4236, "master" is -94,5 to +12 dB with 0dB at "87" in the > >> integer scale. > >> > >> It's a "Master Digital Gain" -- not sure what that "digital" implies as it > >> very much seems to be positioend in the post output mixer analog path... > > > > Maybe the driver should add an internal offset to the dB scale, to > > guarantee that 0dB is max, instead of just copying the hw specs? > > No, really quite definitely not. 0 dB means no attenuation of amplification. > How loud that actually ends up is very much dependent on what's _behind_ > your line-out. Yes, but what I am asking for is to define the dB values of the master control relative to the some ref level on this line-out. What happens after the line-out doesn't matter at all. Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4