Strange Electronic Noise on Fox Sports

Can anyone else hear that strange background noise on Fox Sports broadcasts? It sounds like a faint 1990s cell phone ringtone. It lasts about 2 or 3 seconds, and just keeps repeating every few seconds. I've noticed it on the Tigers/Rangers playoff games, then on the Cardinals/Rangers World Series games, and right now on the Falcons/Lions NFL game. The first time I noticed it I thought it was some sound happening at the Texas Rangers stadium. Then I noticed it during a game at St. Louis and thought it was something related to Fox's MLB coverage, then today on an NFL game suggests Fox Sports or just Fox.

I've noticed it for a few weeks. It's maddening. I've only noticed it on Fox Sports programs. Also, this sound disappears during commercial breaks. It seems most noticeable when there is a lot of crowd noise.

I have NOT noticed it on TBS, ESPN, ABC, CBS or anywhere else. Only Fox.

I've found a few people talking about it on message board sites. Some have heard it on Terra Nova, and the Emmys (both Fox). Someone described it as "a cyclic, tone-repeating sequence." Some people are saying they are hearing it on other channels as well, but I am not, and am wondering if their sound issue might be another one.

It seems to be happening across DirecTV, Dish, Comcast, etc -- leading me to think it's something on Fox's end.

Here's some forums where it's being talked about:

• http://www.hackettstownlife.com/forum/333021
• http://forums.comcast.com/t5/XfinityTV-and-Equipment/Audio-problem-weird-digital-computer-type-sound-in-background/td-p/1066455
• http://forums.verizon.com/t5/FiOS-TV-Technical-Assistance/Annoying-cell-phone-background-noise-on-Fox/td-p/348499
• http://www.reddit.com
• http://www.brambletonian.net/forums/topic/19363-annoying-noise-on-fox/