Turn off noise cancellation by GPO

[Devon_M]

I am helping move users to the 840 G5 from  840 G3 and G4.  We have been using Cisco Proximity to share screens in the conference rooms.  (For those not familiar with Proximity it uses an ultrasonic tone to provide a token for the laptop to connect to the Cisco unit.) 

For the past several years we have used  G1, G2, G3, and G4 versions of the 840 with no incident. 

However, with the G5, with the Bang & Olufsen Audio Control Panel, it has the option to turn on Outbound Noise Cancellation. Which is great most of the time.  However, I have to turn it off for the Proximity to connect.  As I have tested this with several G5s, this seems that the signal is being trashed as noise before the data can be passed to the Proximity software. 

Is there a way to turn this off using a Group Policy or a command line that I can put into a .bat file?  I've got about 500+ laptops that I don't want to have to manually turn it off on all of them. 

[DarkfangQC]

Hi Devon,

We have the same issue and I used ProcMon to find the difference. Here's the .reg :

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Capture\{b3a3d89f-1da8-4fe9-b92d-8e9fd721efb7}\FxProperties]
"{62ed63e1-4ba0-45ba-b9c5-07a20f57f1dd},-1224170752"=hex:41,00,00,00,01,00,00,\
00,01,00,00,00,01,00,00,00

If you want to use a one-line command : 

reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Capture\{b3a3d89f-1da8-4fe9-b92d-8e9fd721efb7}\FxProperties" /v "{62ed63e1-4ba0-45ba-b9c5-07a20f57f1dd},-1224170752" /t REG_BINARY /d 41000000010000000100000001000000

I put the value in bold. 01 : Disable - 00 Enable.

To be apply the reg, you have to use the service account. 

Note: When you use the reg, the GUI won't show the changes. Reboot and you will see it disabled.

Hope that help!