"a brief change of current produced in a circuit. By extension, it could be used for a train of waves (electrical or acoustic) of which it constituted the envelope; but this train would have to be short relative to the interval between it and the next." [1]


  1. Broughton WB. Glossarial Index. In: Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.

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