Glossary beginning with D

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D

damped wave

"waves whose amplitude progressively decreasewith respect to time." [1]


References

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

"The effect of the dissipation of energy of an oscillating system on its operation." [1]


References

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

"Lapse of time from the instant maximum aplitude of a waveform begins to decrease until it has fallen to zero or a specified level near zero." [1]


References

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

db

"One tength of a bel, a logarithmic unit used to compare two levels of power." [1]

"Two powers P1 and P2 are said to be separated by an interval of n bels (or 10n decibels) when n=log10(P1/P2). The unit is dimensionless." [2]


References

  1. Ewing AW. Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
  2. Broughton WB. Glossarial Index. In: Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.
desperation call

"More precise term for one category of distress call." [1]


References

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

Synonyms: desperation-call

digital recorder

"An instrument for making digital recordings of sound." [1]


References

digital recording

"A recording in which the sound is represented by numerous consecutive samples expressed in binary digits (as opposed to an analogue recording)." [1]


References

digitize

"To convert an analogue recording to a digital recording.! [1]


References

diplosyllable

A syllable in which sound is priduced by both to- and fro- movements of the stridulatory apparatus.

"A syllable in which sound is produced by opening and closing wing-strokes in the Ensifera, and both upward and downward leg-strokes in the gomphocerine grasshoppers." [1]


References

Doppler effect

"Change in apparent frequency of a periodic signal such as a pressure wave or light due to movement of the emitter or receiver." [1]

"The change in the observed frequency of a wave caused by the time rate of change in the length of the path of travel between the source and the observer." [2]


References

  1. Ewing AW. Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
  2. Broughton WB. Glossarial Index. In: Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.
Doppler shift compensation

"The emission of echolocation calls at frequencies lower than the hearing sensitivity of teh acoustic fovea so that the upward shift in frequency of the echo, as a result of teh relative velocity of teh bat to the target, ensures that frequency of teh echo is within frequency range of the acoustic fovea." [1]


References

duty cycle

"The ratio of teh duration of the call to the period of the call (call duration + time ot next call). Usually expressed as a percentage." [1]


References

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith