From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Greaves Subject: Re: [Alsa-user] USB card @48kHz only: at what layer to resample? Date: Mon, 25 Sep 2006 21:51:17 +0100 Message-ID: <45184145.3010001@dgreaves.com> References: <1159117628.2899.17.camel@mindpipe> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1159117628.2899.17.camel@mindpipe> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: Lee Revell Cc: alsa-user , Bill Unruh , alsa-devel List-Id: alsa-devel@alsa-project.org Lee Revell wrote: > On Sun, 2006-09-24 at 08:12 -0700, Bill Unruh wrote: >> This is audio card insanity. All CDs are at 44100 but for some reason >> many card manufacturers designed their cards to run at 48000. This is >> a real problem since this requires rate conversion. Rate conversion is >> in general a very very noisy operation. In particular simple linear >> interpolation, which is quick, is also really really terrible for >> sound quality. >> > > DVDs use 48000. But I seem to recall vendors shipping 48Khz-only cards > before playing DVD on a computer was common... > > Lee Wasn't it DAT that set the standard at 48000 - and CDs were made incompatible at 44.1 kHz to prevent digital copying... David ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV