"(1) sound which is undesired by the recipient. Undesired electrical disturbance in a transmission channel or device may also be termed noise, in which case the qualififcation electrical should be included unless it is self evident.
(2) Sound without regularities, confused sum of many unrelated sounds heard together.
(3)"white noise", the extreme case of (2), in which the sound spectrum contains all frequencies in more or less equal measure." 
- . Glossarial Index. Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.
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