[audio] Impulse noise is a category of (acoustic) noise which includes unwanted, almost instantaneous (thus impulse-like) sharp sounds (like clicks and pops). Noises of the kind are usually caused by electromagnetic interference, scratches on the recording disks, and ill synchronization in digital recording and communication. High levels of...
Found on
http://en.wikipedia.org/wiki/Impulse_noise_(audio)

Any type of single or repeated noise of short duration, eg a hammer or power press.
Found on
http://www.encyclo.co.uk/local/20474
No exact match found.