Positioned within a few inches of the speaker's lips, they produce a strong speech signal which stands out clearly against noisy backgrounds.

Yet these signs are placed on a much more noisy background - i.e. the streets.

A key problem here is the extraction of Gaussian signals from a noisy background.

Mike McClure Band - Wild Child at Hank s Texas Grill in McKinney 1-19-08 (noisy background)...

Mike McClure Band - Just not Good Enough at Hank s Texas Grill in McKinney 1-19-08 (noisy background)...

Examples of this type include items depicted out of scale to one another, noisy backgrounds making comparison between elements difficult in a chart or graph, and 3-D simulations in line and bar charts.

The voices had been speaking for some time, against a noisy background Louis took for a ship of war.

The noisy background suggested a ship of war.

Against a noisy background, organisms may have trouble perceiving sounds that are important for intraspecific communication, foraging, predator recognition, or a variety of other ecological functions.

For example, read the text in the noisy background, identify words in this noisy audio, or even identify which of the following pictures are kittens.