Based on these hints I'm one step deeper. If I BOOT with the USB microphone
plugged in then record works, playback results in silence. The audio driver seems to
have redirected sound output, even though the USB device is only a microphone.
If I remove the USB microphone, the sound card comes back to life for playback. I can
play the samples just made. They are time-distorted, however. No matter what sample
rate I specify, it plays back at about a half that.
If I plug the USB microphone back in, nothing works. The USB audio driver fails to
re-hijack the standard audio devices (/dev/dsp, /dev/audio). All this is with Kernel
2.2.4-2 (RedHat 7.1).
-Bryce
bryce <at machine> obviously.com
PS: This USB Headset Microphone also works on the mac, without drivers necessary.
"Eric S. Johansson" wrote:
>
> At 10:21 AM 5/20/2001 -0400, Bryce Nesbitt wrote:
>
> >I have an Andrea AK5370 USB microphone. It works fine in W98. It is
> >recongnized in Linux, and appears in "gmix". But how do I set it as a
> >recording source? What knows how to record from this source?
> >
> > -Bryce
> > bryce "at machine" obviously.com
>
> having gone through this wonderful joy trying to get USB audio to work with
> speech recognition (and I'm still struggling by the way), in the Red Hat
> 7.1 2.4.3 kernel, the USB device will supersede any built-in devices. It's
> kind of weird but if you have in ordinary soundcard up and operational, as
> soon as you plug in the USB microphone the ordinary soundcard configuration
> "goes away". As far as I can determine, the microphone shows up on
> /dev/audio as an ordinary input device so you should be able to record from
> it just fine. Playback is another question. :-)
>
> A simple test I've used was:
>
> od -t x2 < /dev/audio
>
> and as you speak into the microphone, you'll notice the numbers will
> change. If you see lots of pairs of numbers like 8080 7f80 807f then the
> device is configured as an 8-bit audio device. If you see numbers like
> 8000 (plus or minus 2) then the device is configured as a 16-bit device.
>
> Now I have completely exhausted my knowledge on Linux sound systems and
> there are no guarantees that any of what I said is right. :-)
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