From mboxrd@z Thu Jan 1 00:00:00 1970 From: Edson Pereira Subject: Burr Brown PCM290x USB CODEC Date: Fri, 25 Mar 2005 21:11:40 +0900 Message-ID: <4243FFFC.9040907@ybb.ne.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel List-Id: alsa-devel@alsa-project.org Greetings, I am in the process of implementing a small software defined radio receiver using the PCM2903 codec and have a question for the alsa-developers. The ALSA USB-Audio interface is working very well. The audio quality of the chip is quite good, but the chip has a bug! The audio stream of one channel is delayed by one sample in respect to the other channel. This is drastic for the mentioned application since the phase correlation between channels is critical. I have contacted Burr Brown technical support and they have acknowledged the problem. The error is in the FIFO addressing hardware and is present in the ADC as well in the DAC (but in reversed channels). The problem is quite easy to get around in the application, but this prevents the hardware interface being used with other programs (testing software for example). My question is: Where in the system software chain could a work around be implemented? In the ALSA snd-usb-audio? Or is there any other more appropriate place? Thanks and best regards, -- Edson ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click