I've been testing Fedora Core 2 to see if ALSA recognizes my
Intel 82801 sound hardware as a full duplex capable device.
Yippe, it does. BUT...
It seems as though some configuration within ALSA, somewhere...
Is adding/mixing the sound that is being written to the speaker
into the input stream (typically reserved for the microphone
in this case).
For example... I am using this for VOIP.
This is the way the old (non ALSA) sound worked
mic ---> sent to remote connection
speaker <--- remote guys voice
Both operations were independent.
What appears to happen with ALSA is:
+--speaker <----------- remote guys voice
| <-+
| |
| mic --+----+---> sent to remote connection
| +
+-----------------+
ie. What ever my mic is picking up is sent to my speaker
and what ever is sent to my speaker is what's being
sent to the other guy.
1/ my mic should not be fed to my speaker.
2/ what I'm feeding to the speaker should not be part of the
'captured input' stream.
It seems as though some bizare 'record monitor' is enabled (configured)
that is messing up my works.
I'm sure it has something to do with these 'virtual' devices,
software mixers and splitters that ALSA supports, but I haven't
found sufficient documentation to describe how these things
might be configured, or how to interpret what asoundrc.txt
is doing.
Where can I start to look first?
TIA
Fulko
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