[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 15:03:29 UTC 2017

think L might be only near - as mouth directly between the mics when
speaking, the quality is good,  and R sounds good from sitting back in the
chair provided the room isn't noisy.  Could this be?

On Sat, Dec 2, 2017 at 2:52 PM, Thomas Lynch <thomas.walker.lynch at gmail.com>

> I wonder how many people have poor audio pick up unless they speak very
> closely to the mic...  that would be fixed by changing the mic channel mix.
> On Sat, Dec 2, 2017 at 2:49 PM, Thomas Lynch <
> thomas.walker.lynch at gmail.com> wrote:
>> Solved!  whew!
>> https://wiki.archlinux.org/index.php/PulseAudio/Troubleshoot
>> ing#PulseAudio_uses_wrong_microphone
>> 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
>> /etc/pulse/default.pa
>> 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> wrote:
>>> 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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