Re: USB recording - repetitive peaks

[Takashi Iwai <tiwai@suse.de>]

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