| 释义 |
echolocation
ech·o·lo·ca·tion E0028400 (ĕk′ō-lō-kā′shən)n.1. A sensory system in certain animals, such as bats and dolphins, in which usually high-pitched sounds are emitted and their echoes interpreted to determine the direction and distance of objects.2. Electronics A process for determining the location of objects by emitting sound waves and analyzing the waves reflected back to the sender by the object. In both senses also called echo ranging.
ech′o·lo·cate′ (-lō-kāt′) v.echolocation (ˌɛkəʊləʊˈkeɪʃən) n (General Engineering) determination of the position of an object by measuring the time taken for an echo to return from it and its directionech•o•lo•ca•tion (ˌɛk oʊ loʊˈkeɪ ʃən)
n. 1. a method of locating objects by determining the time for an echo to return and the direction from which it returns, as by radar or sonar. 2. the sonarlike system used by dolphins, bats, and other animals to detect objects by emitting usu. high-pitched sounds that reflect off the object and return to the ears or other sensory receptors. [1944] ech`o•lo′cate, v.t. -cat•ed, -cat•ing. ech`o•lo′ca•tor, n. ech·o·lo·ca·tion (ĕk′ō-lō-kā′shən)1. A sensory system in certain animals, such as bats and dolphins, in which the animals send out high-pitched sounds and use their echoes to determine the position of objects. See Note at bat.2. The use of reflected sound waves, as by radar or sonar, to determine the location and size of distant or underwater objects.echolocationthe fixing of the position of an object by transmitting a signal and measuring the time required for it to bounce back, typically done by radar or sonar and by bats.See also: Sound
the fixing of the position of an object by transmitting a signal and measuring the time required for it to bounce back, typically done by radar or sonar.See also: DistanceThesaurus| Noun | 1. | echolocation - determining the location of something by measuring the time it takes for an echo to return from itecho soundinglocalization, locating, localisation, location, fix - a determination of the place where something is; "he got a good fix on the target" |
Translationsecholocation
echolocation determination of the position of an object by measuring the time taken for an echo to return from it and its direction Echolocation the perception of reflected sound waves, usually high-frequency, by certain animals, which emit them to detect objects in space, such as prey or obstacles, and determine their properties and dimensions. Echolocation is one of the means by which animals orient themselves in space. It is developed in bats and dolphins and has been discovered in shrews, a number of species of seals, and birds, including oilbirds and salanganes. In dolphins and bats, echolocation is based on the emission of ultrasonic impulses with frequencies of as high as 130–200 kilo-hertz (kHz) and duration of signals usually from 0.2 to 4–5 milliseconds, sometimes more. In birds that live in dark caves, such as oilbirds and salanganes, it is used for orientation in the dark; they emit low-frequency signals of 7–4 kHz. Dolphins and bats use echolocation not only to determine their general orientation, but also to determine the spatial position of an object and its dimensions. In a number of cases echolocation even enables them to recognize the appearance of an object and therefore often serves as an important means of searching out and capturing food. REFERENCEAirapet’iants, E. Sh., and A. I. Konstantinov. Ekholokatsiia v prirode, 2nd ed. Leningrad, 1974.G. N. SIMKIN echolocation[′ek·ō·lō‚kā·shən] (biophysics) An animal's use of sound reflections to localize objects and to orient in the environment. echolocation
ech·o·lo·ca·tion (ek'ō-lō-kā'shŭn), Term applied to the method by which bats direct their flight and avoid solid objects. The creatures emit high-pitched cries that, though inaudible to human ears, are heard by the bats themselves as reflected sounds (echoes) from objects in their path.echolocation the means by which objects are identified through echoes returned from very high frequency sound emissions. Bats use such a system to avoid objects in flight and to locate prey, as do toothed whales and dolphins.echolocation
Related to echolocation: Human echolocationSynonyms for echolocationnoun determining the location of something by measuring the time it takes for an echo to return from itSynonymsRelated Words- localization
- locating
- localisation
- location
- fix
|