Takashi Iwai wrote: > 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? >
They were arecord -f cd > you can see the running status and condition on streamX proc file > during playback/capture. > ---- # cat /proc/asound/card2/stream1 M Audio USB AudioSport Quattro (tm) : USB Audio #1 Playback: Status: Stop Altset 3 Format: S16_LE Channels: 2 Endpoint: 3 OUT (ADAPTIVE) Rates: 11025, 22050, 44100, 48000 Altset 2 Format: S24_3LE Channels: 2 Endpoint: 3 OUT (ADAPTIVE) Rates: 11025, 22050, 44100, 48000 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 3 OUT (ADAPTIVE) Rates: 88200, 96000 Capture: Status: Running Packets = 20 URBs = 5 Packet Size = 192 Nominal freq = 44. 1682 Altset 3 Format: S16_LE Channels: 2 Endpoint: 5 IN (SYNC) Rates: 11025, 22050, 44100, 48000 Altset 2 Format: S24_3LE Channels: 2 Endpoint: 5 IN (SYNC) Rates: 11025, 22050, 44100, 48000 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 5 IN (SYNC) Rates: 88200, 96000 ---- > > >>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? They are so regular you can set a use them as a metronome:) Would you like me to have a look at the timing in an editor or is there an more precise way to find out? > i guess this has relation between the status shown in the proc file > above. > > > Takashi > > -- 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 Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel