From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Rigg Subject: Re: Sample Rate Conversion Quality in ALSA Date: Mon, 21 Aug 2006 16:03:38 +0100 Message-ID: <20060821150338.GA3360@localhost.localdomain> References: <44E9AAFA.2060400@superbug.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: 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: Marc Brooker Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org On Mon, Aug 21, 2006 at 03:02:07PM +0200, Marc Brooker wrote: > Let me see if I understand you correctly. In the scenario that you > presented the application is told that there are 940 samples per > period. ALSA, internally, converts these to 1024 samples per period at > 48kHz sample rate. So the material (sampled at 44100Hz) is played back > at a rate of 44062Hz? I don't know enough about the field to know if > this error (0.08%) will be audible. To put that in perspective, a semitone is around 6% change in pitch. The error here looks small at 0.08% but it's enough to make a musical note sound out of tune. John ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642