The term typically refers to the addition of unwanted signals to a useful signal.

These systems may have considerable mechanical inertia that will provide a useful signal.

In practice, though, the rules tend to create problems by muffling the useful signals that prices send.

To be a useful signal to the market, any fuel-price increase would have to be large, many people think.

He also sends a useful signal about America's willingness to use appropriate military force in defense of clear national interests.

Given the challenges, it's something of a miracle we can collect useful signals at all.

Fatigue, hunger, cold, pain-these things no longer drove them, but rather were simply useful signals that a good engine needed attention.

The ability to extract useful signals from the stream of information is key to success moving forward.

But he added: "It sent us a useful signal.

The reason for this condition can be seen by considering that a useful signal is composed of many different wavelengths in the frequency domain.