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stereo -> mono crashdown when using VPIO unit
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stereo -> mono crashdown when using VPIO unit


  • Subject: stereo -> mono crashdown when using VPIO unit
  • From: Lucas Ives <email@hidden>
  • Date: Fri, 11 Jan 2013 12:09:14 -0800



Hey all,

I'm working in iOS and using the vpio unit to record speech, as well
as playback unrelated stereo audio data (sound effects).
With the vpio unit, my stereo sound effects seem to be crashed down to
mono.  If I switch to the remoteIO unit -- no other code changes -- the 
sounds play correctly in full stereo. 

This happens if I'm using the device speakers or headphones (i.e. audio
output route doesn't seem to matter, although I thought I'd read 
something to the effect of echo cancellation being completely disabled 
with a headphone routing?).  I've tried disabling AGC but it doesn't
make a difference.

1.  Is this expected behavior with the vpio unit (stereo audio played 
back as summed mono)?  

2.  If #1 is a yes, is there a way to disable this "feature" / or other 
ways to hack around it?
3.  Am I correct in assuming that using two units, vpio for input and
remoteIO for output, completely negates any echo cancellation benefit
since the input unit won't have access to the output samples?

Thanks in advance for any help -- I've been beating my head against this
for a while now.

Best,
-Lucas

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