From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 5 Oct 2001 11:00:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 5 Oct 2001 11:00:14 -0400 Received: from smtp02.uc3m.es ([163.117.136.122]:12552 "HELO smtp.uc3m.es") by vger.kernel.org with SMTP id ; Fri, 5 Oct 2001 11:00:01 -0400 Message-ID: <3BBDCC4C.EF9F7C49@tsc.uc3m.es> Date: Fri, 05 Oct 2001 17:05:48 +0200 From: noreply@tsc.uc3m.es X-Mailer: Mozilla 4.51 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Re: Sound artifacts in Gravis Ultrasound Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > 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. I have the exact same problems using a Sound Blaster 128 PCI with the es1371. It's a linux problem because it works with Windows 98.