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/
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