Re: [LAU] Building a DAW

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To: Fons Adriaensen <fons@...>
Cc: <linux-audio-user@...>
Date: Tuesday, June 2, 2009 - 7:28 pm

On Tue, Jun 2, 2009 at 12:46 PM, Fons Adriaensen wrote:

there are "hidden" options. the default settings assume that the
timecode source and the audio interface that is driving JACK share a
sample/word clock, so that 1 second of timecode time == 1 second of
audio samples, and thus no varispeeding is necessary. essentially, we
just notice that timecode starts, stops and jumps non-linearly, and
respond appropriately.

however, you can change this setting (there is no GUI for it because
i've yet to find anyone who can actually defend adding this option to
the GUI), and in that mode ardour will varispeed to stay locked to the
master. it will stay locked to within 8-30 samples of the master's
timecode position. the varispeed interpolation (linear, fixed point)
is weak, and so technically quality will suffer. whether its suffering
worth fixing is a matter that reasonable people might reasonably
disagree about.

when i initially developed MTC slaving, i used an Alesis M20 ADAT
*without* sample/word clock sync. ardour would follow the wow+flutter
of the M20 perfectly. it would even follow it if i used the
shuttle/scrub controller on the M20.
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Messages in current thread:
[LAU] Building a DAW, Ricus Vincente, (Sat May 30, 4:28 pm)
Re: [LAU] Building a DAW, Kevin Cosgrove, (Sat May 30, 8:11 pm)
Re: [LAU] Building a DAW, Asmo Koskinen, (Sat May 30, 5:00 pm)
Re: [LAU] Building a DAW, Joe Hartley, (Sat May 30, 4:57 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sun May 31, 5:04 pm)
Re: [LAU] Building a DAW, Fons Adriaensen, (Sun May 31, 5:39 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sun May 31, 7:29 pm)
Re: [LAU] Building a DAW, Ken Restivo, (Fri Jun 5, 6:53 am)
Re: [LAU] Building a DAW, Fons Adriaensen, (Sun May 31, 8:09 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sun May 31, 8:54 pm)
Re: [LAU] Building a DAW, Florian Faber, (Mon Jun 1, 3:01 am)
Re: [LAU] Building a DAW, Fons Adriaensen, (Sun May 31, 9:16 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sun May 31, 9:49 pm)
Re: [LAU] Building a DAW, Paul Davis, (Tue Jun 2, 4:20 pm)
Re: [LAU] Building a DAW, drew Roberts, (Tue Jun 2, 5:49 pm)
Re: [LAU] Building a DAW, Fons Adriaensen, (Tue Jun 2, 4:48 pm)
Re: [LAU] Building a DAW, Paul Davis, (Tue Jun 2, 7:28 pm)
Re: [LAU] Building a DAW, Fons Adriaensen, (Tue Jun 2, 8:42 pm)
Re: [LAU] Building a DAW, Ricardus Vincente, (Tue Jun 2, 8:56 pm)
Re: [LAU] Building a DAW, Fons Adriaensen, (Tue Jun 2, 9:37 pm)
Re: [LAU] Building a DAW, Fons Adriaensen, (Tue Jun 2, 9:21 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Tue Jun 2, 8:00 pm)
Re: [LAU] Building a DAW, Florian Faber, (Tue Jun 2, 5:24 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Tue Jun 2, 4:28 pm)
Re: [LAU] Building a DAW, Florian Faber, (Sun May 31, 5:31 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sun May 31, 5:53 pm)
Re: [LAU] Building a DAW, Mark Knecht, (Sun May 31, 5:10 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 5:53 pm)
Re: [LAU] Building a DAW, Kevin Cosgrove, (Sat May 30, 8:13 pm)
Re: [LAU] Building a DAW, Joe Hartley, (Sat May 30, 7:07 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 7:28 pm)
Re: [LAU] Building a DAW, Kevin Cosgrove, (Sat May 30, 8:15 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 8:21 pm)
Re: [LAU] Building a DAW, Kevin Cosgrove, (Sat May 30, 10:10 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 10:20 pm)
Re: [LAU] Building a DAW, Kevin Cosgrove, (Sat May 30, 10:25 pm)
Re: [LAU] Building a DAW, Ray Rashif, (Sun May 31, 4:15 am)
Re: [LAU] Building a DAW, Justin Smith, (Sat May 30, 7:46 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 8:02 pm)
Re: [LAU] Building a DAW, Joe Hartley, (Sat May 30, 7:44 pm)
Re: [LAU] Building a DAW, Justin Smith, (Sat May 30, 7:52 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 7:50 pm)
Re: [LAU] Building a DAW, Florian Faber, (Sat May 30, 8:04 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 8:11 pm)
Re: [LAU] Building a DAW, Asmo Koskinen, (Sat May 30, 7:22 pm)
Re: [LAU] Building a DAW, Asmo Koskinen, (Sat May 30, 6:24 pm)
Re: [LAU] Building a DAW, Ricus Vincente, (Sat May 30, 5:04 pm)