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noise

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n. ~ 1. Unwanted or extraneous information that degrades the reproduction of an original. - 2. Undesirable sounds in an environment.

Notes: 

Noise1 in a video signal may appear as specks in the image that were not in the original but introduced during transmission or reproduction. In sound recordings or broadcasts, noise is perceived as static. In computer networks, noise may cause bit loss and result in corrupted data.