LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Karel Kulhavy <clock@atrey.karlin.mff.cuni.cz>
To: linux-kernel@vger.kernel.org
Subject: Sound artifacts in Gravis Ultrasound
Date: Fri, 5 Oct 2001 09:03:07 +0200	[thread overview]
Message-ID: <20011005090307.A16202@atrey.karlin.mff.cuni.cz> (raw)

I have a Gravis Ultrasound sound card. I suspect kernel from non-continuous feed of audio
data into the device.

When I feed directly a sine-wave data into /dev/dsp, 100Hz, 1KHz, 10kHz, there is
a distortion that can be heard on 1kHz, is not heard on 100Hz and is very strong at 10kHz.
It sounds like every several-per-second to several-ten-per-second, the data in the sound
card are repeated (for several samples). The distortion occurs permanently and generates
a regular sound, something like a car ignition system makes in board radio.

When I play mp3 (mpg123) or Ogg Vorbis (ogg123), it can be heard also, when suitable
pattern is present in the music to make the distortion audible.

It is not caused by my amplifier (audible also in earphones), not caused by too
much volume (when playing on low volume, it is also there, it's a linear phenomenon).
The sound of distortion is also not added to the signal, because can not be heard
when certain sound patterns appear in the music.

Is there any kernel setting that improves continuity of data feed? The card is
Gravis Ultrasound Plug'n'play, on ISA.

Clock


             reply	other threads:[~2001-10-05  7:03 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-10-05  7:03 Karel Kulhavy [this message]
2001-10-05 15:05 noreply

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=20011005090307.A16202@atrey.karlin.mff.cuni.cz \
    --to=clock@atrey.karlin.mff.cuni.cz \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: Sound artifacts in Gravis Ultrasound' \
    /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

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).