[pulseaudio-discuss] audio left and right channels from microphone are L+R and L-R

Thomas Lynch thomas.walker.lynch at gmail.com
Sat Dec 2 14:49:20 UTC 2017

Solved!  whew!


section:  Another Possible Cause
and changed 'front-right'  to 'front-left'

also, BTW, the new load mod commands have to go at the bottom of the

Right only is fine.  I wonder if it is really R+L and R-L.  It might be
more like direct and periphery,  or some such.  L is live, it is just that
it doesn't represent sound in front of the machine.  When moving right on
top of it, and speaking directly it does pick up.

On Sat, Dec 2, 2017 at 2:01 PM, Thomas Lynch <thomas.walker.lynch at gmail.com>

> Hello,
> Please include my email address in replies.
> This laptop has two built in microphones on the lid.
> I've been running sound tests using the pulse audio sound control to turn
> down the gain on the right or alternatively, left, microphone, then using
> audacity to monitor the results.  (I have also used gnome-sound recorder
> and skype to monitor the results, as they are a bit surprising.)
> The right channel is being sent to audacity as L+R.   The left channel is
> being sent to audacity as as L-R.   Yes, it took a while to figure this out.
> The new Skype client is using only the left microphone, so the sound
> quality is very poor, near perfect cancellation at any distance from the
> mic.
> 1. Has anyone run across this before?  Is this a known problem?
> 2. Is there a simple test for microphone channel input that can be used to
> determine if this is a hard problem or a driver problem?
> 3. is there a way to turn off the left and cross the right channel into
> the left at a low level?  I dont need stereo on the microphone on this
> machine, at least not now as I am traveling.
> Thank you so much for helping with this.
> Thomas.Walker.Lynch at gmail.com
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