From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Faber Subject: Re: What does 0dB refer to? (Logitech USB Speakers) Date: Tue, 15 Apr 2008 06:09:00 +0200 Message-ID: <200804150609.00533.faber@faberman.de> References: <20080411204610.GA32413@tango.0pointer.de> <4803DF09.3000000@keyaccess.nl> <20080414235742.GB19108@tango.0pointer.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from india820.server4you.de (static-ip-85-25-152-101.inaddr.intergenia.de [85.25.152.101]) by alsa0.perex.cz (Postfix) with ESMTP id C1A0424677 for ; Tue, 15 Apr 2008 06:09:11 +0200 (CEST) In-Reply-To: <20080414235742.GB19108@tango.0pointer.de> Content-Disposition: inline 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: Rene Herman , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On Tuesday 15 April 2008 01:57:45 Lennart Poettering wrote: > Dude, hush, hush, fix Wikipedia! It still says: "The decibel (dB) is > a logarithmic unit of measurement that expresses the magnitude of a > physical quantity _relative_ _to_ a specified or implied _reference_ > _level_". The reference level is well defined (depending on the consumer/pro audio context) and so is dBFS, dBu(RMS) and dBV(RMS). I don't see any problem with that except that some people don't seem to know about this or don't care. Especially crappy sound card manufacturers. Oh boy, and we didn't even start bringing in head room into the debate.. Flo -- Machines can do the work, so people have time to think. public key 6C002249 x-hkp://wwwkeys.eu.pgp.net