From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Davis Subject: Re: Easy question: ppq and tempo Date: Fri, 24 May 2002 10:37:49 -0400 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <200205241435.QAA00530@alsa.alsa-project.org> References: Return-path: Received: from newmx1.fast.net (newmx1.fast.net [209.92.1.31]) by alsa.alsa-project.org (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) with ESMTP id QAA00530 for ; Fri, 24 May 2002 16:35:29 +0200 In-Reply-To: Your message of "Fri, 24 May 2002 16:18:16 +0200." Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Tim Goetze Cc: Gerald Grabner , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org >>"ppq" stands for "parts per quarter". as the header file suggests >>without much explanation, its length of a quarter note expressed in >>clock ticks. if the meter is 4/4 and the tempo is 120bpm, then a >>quarter note lasts 0.5 seconds. if the clock used for timing ticks 100 >>times per second, there are 50 clock ticks per quarter note, so >>ppq=50. > >though usually it will be a number divisible by 3 and 4 to make >triplets and even beats alike coincide with integer ticks. cubase >on the atari used to set this to 192, though some do prefer 480 or >even more to allow for minute timing ('groove') adjustments. where "it" is the clock ticks per second. thanks tim, i had always wondered why 192 or 480 etc. was used, and never knew until now :) --p _______________________________________________________________ Don't miss the 2002 Sprint PCS Application Developer's Conference August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm