From: Pavel Hofman <pavel.hofman@ivitera.com>
To: Torsten Schenk <torsten.schenk@zoho.com>
Cc: 'ALSA Development Mailing List' <alsa-devel@alsa-project.org>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Subject: Re: USB Audio questions
Date: Wed, 17 Aug 2011 00:11:55 +0200 [thread overview]
Message-ID: <4E4AEB2B.4030700@ivitera.com> (raw)
In-Reply-To: <131d4536813.-8375004616171444232.4180326891785246293@zoho.com>
Dne 16.8.2011 22:41, Torsten Schenk napsal(a):
> Hi Pierre,
>
> - The device/driver sends per urb a constant number of packets (as
> you already also discovered). The number of samples per packet differ
> however (+- 1 sample per packet). I accuse the asynchronousity
> between the urb interval and the sound card's internal clock for this
> fact. The device expects the driver to send back an urb with exactly
> the same structure. The device produced crackling noise if the
> samples per packet were not equal. I cannot say to what extend this
> is true (i.e. if you could wait some packets until catching up the
> difference without producing crackles)
Could we attribute this to the adaptive mode and PLL striving to produce
steady stream of well-timed samples to the DAC? IMHO the lower variation
in samples per packet, the lower jitter of the PLL-recovered clock.
Pavel.
next prev parent reply other threads:[~2011-08-16 22:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-15 18:15 [PATCH 1/4] ASoC: DAPM: Allow multiple mixer sources to be routed via the same switch Lars-Peter Clausen
2011-08-15 18:15 ` [PATCH 2/4] ASoC: Add ADAU1373 codec support Lars-Peter Clausen
2011-08-15 20:31 ` USB Audio questions Pierre-Louis Bossart
[not found] ` <4e498227.854fdf0a.0dd4.6281SMTPIN_ADDED@mx.google.com>
2011-08-15 20:55 ` Daniel Mack
2011-08-15 21:48 ` Pierre-Louis Bossart
[not found] ` <000001cc5b8a$4a6577c0$df306740$@bossart@linux.intel.com>
2011-08-16 5:30 ` David Henningsson
2011-08-16 6:47 ` Clemens Ladisch
2011-08-16 6:37 ` Clemens Ladisch
2011-08-16 7:30 ` Daniel Mack
2011-08-16 15:46 ` Clemens Ladisch
2011-08-16 15:38 ` Pierre-Louis Bossart
[not found] ` <20110816145353.GB5233@xanatos>
2011-08-16 15:44 ` Pierre-Louis Bossart
[not found] ` <000601cc5c2a$87a26350$96e729f0$@bossart@linux.intel.com>
2011-08-16 16:09 ` Clemens Ladisch
2011-08-16 17:19 ` Pierre-Louis Bossart
[not found] ` <000001cc5c38$b07abee0$11703ca0$@bossart@linux.intel.com>
2011-08-17 6:29 ` Clemens Ladisch
2011-08-17 15:21 ` Pierre-Louis Bossart
2011-08-19 22:02 ` Pierre-Louis Bossart
2011-08-16 20:41 ` Torsten Schenk
2011-08-16 22:11 ` Pavel Hofman [this message]
2011-08-17 6:36 ` Clemens Ladisch
[not found] ` <000001cc5c5a$e7d5c3e0$b7814ba0$@bossart@linux.intel.com>
2011-08-16 22:13 ` Torsten Schenk
2011-08-16 15:54 ` [PATCH 2/4] ASoC: Add ADAU1373 codec support Mark Brown
2011-08-15 18:15 ` [PATCH 3/4] ASoC: Blackfin: ADAU1373 eval board support Lars-Peter Clausen
2011-08-16 15:54 ` Mark Brown
2011-08-15 18:15 ` [PATCH 4/4] Blackfin: bf537: Stamp: Register ASoC EVAL-ADAU1373 board driver Lars-Peter Clausen
2011-08-16 15:56 ` Mark Brown
2011-08-18 13:52 ` Lars-Peter Clausen
2011-08-15 23:25 ` [PATCH 1/4] ASoC: DAPM: Allow multiple mixer sources to be routed via the same switch Mark Brown
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E4AEB2B.4030700@ivitera.com \
--to=pavel.hofman@ivitera.com \
--cc=alsa-devel@alsa-project.org \
--cc=pierre-louis.bossart@linux.intel.com \
--cc=torsten.schenk@zoho.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox