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From: Daniel Mack <daniel@caiaq.de>
To: Clemens Ladisch <clemens@ladisch.de>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org,
	Felix Homann <linuxaudio@showlabor.de>
Subject: Re: Need expert's advice - Fast Track Ultra (8R) dropping samples
Date: Thu, 7 Oct 2010 10:10:11 +0200	[thread overview]
Message-ID: <20101007081010.GZ7159@buzzloop.caiaq.de> (raw)
In-Reply-To: <4CAD6AA2.4050205@ladisch.de>

On Thu, Oct 07, 2010 at 08:37:22AM +0200, Clemens Ladisch wrote:
> Felix Homann wrote:
> > Am 06.10.2010 16:38, schrieb Clemens Ladisch:
> > > this device does not use frequency feedback.
> > >
> > > What happens when you are recording something and then try to play
> > > something else with a different sample rate?
> > 
> > When I start recording at 44.1 kHz while playing a wav at 48 kHz the
> > playback gets very distorted, sounds like lots of missing samples.
> 
> So this device expects the computer to take the sample clock from the
> capture data.   This is just like the UA-101; it should be possible to
> write a similar driver (with opportunities for code sharing, and AFAIK
> UAC 2 requires such a feedback mode, too).

Ah, that makes sense, yes. UAC2 calls this mode "implicit feedback".
Felix, can you provide a dump of "lsusb -v" for this device?

Daniel

  reply	other threads:[~2010-10-07  8:10 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-25  9:57 Need expert's advice - Fast Track Ultra (8R) dropping samples Felix Homann
2010-10-01 11:00 ` Felix Homann
2010-10-01 16:29   ` Clemens Ladisch
2010-10-03 11:50     ` Felix Homann
2010-10-03 12:00       ` Daniel Mack
2010-10-05  7:21       ` Clemens Ladisch
2010-10-06 13:57         ` Felix Homann
2010-10-06 14:38           ` Clemens Ladisch
2010-10-06 16:31             ` Felix Homann
2010-10-07  6:37               ` Clemens Ladisch
2010-10-07  8:10                 ` Daniel Mack [this message]
2010-10-07  8:50                   ` Felix Homann
2010-10-07 11:35                   ` Felix Homann
2010-10-08  6:26                     ` Clemens Ladisch
2010-10-12  7:18                       ` Daniel Mack
2010-10-12  8:18                         ` Felix Homann
2010-10-12 10:26                           ` Daniel Mack
2010-10-13  7:47                             ` Felix Homann
2010-10-13 12:48                               ` Daniel Mack
2010-10-15  7:23                             ` Clemens Ladisch
2010-10-15  8:59                               ` Daniel Mack
2010-10-15 11:08                                 ` Felix Homann
2010-10-15 14:21                                 ` Clemens Ladisch
2010-10-03 10:02 ` Daniel Mack

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