From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wilfried Weissmann Subject: Re: Occasional metallic sound when recording (cs46xx) Date: Thu, 23 Oct 2003 20:37:39 +0200 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3F981FF3.4040902@gmx.at> References: <200310221739.h9MHd0m1024945@oud.linuxaudiosystems.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Paul Davis Cc: "Eloy A. Paris" , alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Paul Davis wrote: >>This problem happens randomly but is very annoying, specially if I >>program my PVR (MythTV) to automatically record a show - the show can >>get recorded with metallic sound, which makes it very hard to understand >>during playback. >> >>This is not MythTV-specific since I have been able to reproduce the >>problem using other applications, like the Gnome sound recorder. It is >>unrelated to full-duplex operation since when recording a show MythTV >>doesn't open /dev/dsp for writing. >> >>I really have no idea about how to troubleshoot this. I don't think >>the problem is hardware, but is driver-related instead. > > > its almost certainly a software problem in mythTV and gnome sound > recorder. i've written code that does this several times - every time > it takes me ages to figure out why, and then i can never remember when > i do it the next time. its related to off-by-1 errors in processing > incoming audio. i also have the same problem with speakfreely with my cs46xx. it does not look like the metallic sound is triggered by any specific event (load, I/O,...). out of the sudden somethings goes wrong. i think i also experienced it with the kde sound recorder. but i have not updated the alsa driver for a while (still 0.9.5 or so). toggleing the ADC sounds like a good idea. i have not tried that yet but reloading the modules works too. > > not necessarily, of course, just a point of view. hmm, what makes something sound metallic anyway? echo? bye, wilfried ------------------------------------------------------- This SF.net email is sponsored by: The SF.net Donation Program. Do you like what SourceForge.net is doing for the Open Source Community? Make a contribution, and help us add new features and functionality. Click here: http://sourceforge.net/donate/