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mazhurg
Premium
join:2004-05-02
Portage La Prairie, MB
Reviews:
·MTS

Strange cause - effect

Ok, here is a weird one:

House has a 1 GB networked environment, with computer, NAS, PS3, Sony Bravia TV wired and additional wireless devices.

For some reasons, anytime someone turns on the TV, the PC volume drops by about 30%. Turning off the TV restores the PC sound to proper volume. Disconnecting the TV from the network does not show this effect. TV and PC are on different electrical circuits.

Can't figure out why this would be.

PC is a home-system Asus MB P8H7 (integrated HD sound), Logitech G35 (voice), Xfired AMD cards, 8 GB memory runnning Windows 8 (was doing this in Windows 7 also). This effect is happening no matter which sound subsystem is active.

Note that this system had an HD creative Titanium sound card previously and the same thing was happening.

Not that this is a show stopper, only would like to understand why it is happening.

Anyone hazard a guess?



aurgathor

join:2002-12-01
Lynnwood, WA
kudos:1

You need to methodically rule out various possibilities.

If you unplug the network cable either from the TV or from the PC, is it still happening?
--
Wacky Races 2012!



mazhurg
Premium
join:2004-05-02
Portage La Prairie, MB
Reviews:
·MTS

Hi,

As mentioned above, I did indicate that the effect ceases when you unhook the LAN from the TV, so I know that somehow the network is involved.

I am just curious on what happens as other than the LAN connection which is used by the TV to access Netflix, the TV itself (other than having a local address to the router) is not providing any network services and is not listed as a network media device.

The computer is not set to receive data from the TV and even if it was has no provision to have remote volume control. Yet, turning on the TV has the immediate effect of lowering the volume on the PC by about 30% (estimate) and turning off the TV restores the volume as what it was before.

There are no indications other than the sound level itself (ie as far as the computer is concerned, nothing has changed).



aurgathor

join:2002-12-01
Lynnwood, WA
kudos:1

Set up a firewall on the PC and block all incoming connections. If it doesn't happen, keep unblocking connections one-by-one.
--
Wacky Races 2012!


n_w95482
Premium
join:2005-08-03
Ukiah, CA
reply to mazhurg

Try running Wireshark on the PC while turning the TV on and off.
--
KI6RIT