From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Iwai Subject: Re: USB recording - repetitive peaks Date: Tue, 02 Jul 2002 16:57:04 +0200 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: References: <3D208C5C.36649172@ladisch.de> <3D21B878.8090902@boosthardware.com> Mime-Version: 1.0 (generated by SEMI 1.14.3 - "Ushinoya") Content-Type: text/plain; charset=US-ASCII Return-path: In-Reply-To: <3D21B878.8090902@boosthardware.com> Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Patrick Shirkey Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Hi Patrick, At Tue, 02 Jul 2002 23:28:08 +0900, Patrick Shirkey wrote: > > Thanks to your patch Takashi we have two people who have been able to > record through the quattro. > > We have both found that there is a constant repetitive peak in the > signal which reminds me of the problems I had with the cmipci for a > brief period. > > Thorsten Hass has recorded a perfect example for you which he did using > aplay and arecord. It is a sine wave so is easy on the ears. > > http://www.thorstenhaas.de/alsa/audio.file hmm, this sounds like the mismatching of packet size and copy destination. i heard your ogg file, and this was similar, too. under which condition were they recorded? with 24bit/96kHz/2ch? or does it happen generally on every condition? you can see the running status and condition on streamX proc file during playback/capture. > He has also generated a jpeg plotted by an oscilloscope while recording > which I can send you if it will help. can you figure out how long the period of puls is? i guess this has relation between the status shown in the proc file above. Takashi ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf