Conspiracy theories

So I'm sitting here listening to the TV. It's making this odd noise - becomes more and more noticeable as the volume gets lower. It's like a subsonic very fast-paced drumming, thumping along underneath everything, a deep sound that gets into my bones and irritates the heck out of me.

It's a sound I've never heard before from our TV.

The thing that has changed is that our TV is now running through a digital set-top box kindly donated by the IL's. I have no clue why a digital box would make this noise come through the speakers when it never did before. When the TV runs on analog, you can't hear it. And when you are listening/watching DVD's, you can't hear it.

So me being me, I'm listening to this thumping and wondering why it's the newest technology that's causing the weirdness. I start to wonder what else they are transmitting along this digital signal. What are they thumping along through that multitude of new digital signals that this magic little box is picking up.

Anyone else out there into conspiracy theory fiction? Coz I've got an inkling of a novel idea....