From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick Shirkey Subject: Re: Re: USB recording - repetitive peaks Date: Fri, 05 Jul 2002 17:34:39 +0900 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3D255A1F.6090505@boosthardware.com> References: <3D208C5C.36649172@ladisch.de> <3D247676.8090309@boosthardware.com> <200207042059.10950.thorsten.haas@gmx.de> <200207050856.26032.thorsten.haas@gmx.de> 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: Thorsten Haas Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Thorsten Haas wrote: >>>I'm not sure about the sound quality it is definitely better. I will see >>>if I can generate a test tone to use instead of actual music. >> > > I checked out cvs this morning and compiled. I grabbed my function generator > and fed my quattro usb with some signal; 400Hz, 0,7V peak-to-peak. > > It's working finely now. (no more peaks) > > I did the same thing some days before. ( Whoever is interested in the results > and the output of the oscilloscope: http://www.thorstenhaas.de/alsa.php) > > That looks much better. We still face the problem of accessing all 4 channels at once. AFAICT in the .asoundrc file the multi interface option does not have the ability to seperately access the channels in non sequential order. Therefore we are currently unable to access all the channels on the card because pcm0 and pcm1 point to the same physical channels input 1 and input 2. We need to either reorganise the pcm devices for the card or make it possible to secify channels in non sequential order using the multi interface option in a .asoundrc. -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.boosthardware.com/LAU/guide/ ======================================== ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Bringing you mounds of caffeinated joy. http://thinkgeek.com/sf