# Isochronous

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Isochronous

Isochronous : From Greek iso, "equal" + chronos, time. It literally means to occur at the same time or at equal time intervals. The term is used in different technical contexts.

*In telecommunication, "isochronous" has the following meanings:
#Of a periodic signal, pertaining to transmission in which the time interval separating any two corresponding transitions is equal to the unit interval or to a multiple of the unit interval; but phase is arbitrary (and in some systems may change slowly over time)
#Pertaining to data transmission in which corresponding significant instants of two or more sequential signals have a constant phase relationship.
*In power generation, "isochronous" means that the frequency of the electricity generated is 'flat' or constant, and there is zero generator droop.
*In the Universal Serial Bus used in computers, "isochronous" is one of the four data flow types for USB devices (the others being Control, Interrupt and Bulk). It is commonly used for streaming data types such as video or audio sources.
*In dynamical system theory an oscillator is called "isochronous" if the frequency is independent of its amplitude. For instance, in horology, "isochronous" refers to a mechanical clock or watch which runs at the same rate regardless of changes in its drive force, so it keeps correct time as the mainspring unwinds.
*In particle accelerators an isochronous cyclotron is a cyclotron where the field strength increases with radius to compensate for relativistic increase in mass with speed

Closely related to the property of being "isochronous" is the term isochrone referring to contour lines of equal time, for instance, in geological layers, tree rings or wave fronts.

References

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### Look at other dictionaries:

• Isochronous — I*soch ro*nous, a. [Gr. ?; i sos equal + ? time.] Same as {Isochronal}. [1913 Webster] …   The Collaborative International Dictionary of English

• isochronous — (adj.) 1706, with suffix OUS (Cf. ous), from Mod.L. isochronus, from Gk. isokhronos equal in time, from iso equal + khronos time. Earlier in same sense was isochronal (1670s) …   Etymology dictionary

• isochronous — adjective a) happening at regular intervals Their entire national telephone network is isochronous, with a clock distribution tree radiating from a single, protected cesium reference clock. b) happening at the same time; isochronal These packets… …   Wiktionary

• isochronous — adjective Etymology: Greek isochronos Date: 1706 isochronal • isochronously adverb …   New Collegiate Dictionary

• isochronous — isochronously, adv. /uy sok reuh neuhs/, adj. isochronal. [1700 10; < NL isochronus. See ISOCHRONAL, OUS] * * * …   Universalium

• isochronous — Occurring during the same time. * * * isoch·ro·nous (i sokґrə nəs) [iso + chrono + ous] 1. performed in equal times; said of motions, vibrations, or waves occurring at the same time and being equal in duration. 2. of ciliary beating,… …   Medical dictionary

• isochronous — (Roget s Thesaurus II) adjective Happening or appearing at regular intervals: cyclic, cyclical, isochronal, periodic, periodical, recurrent. Idiom: like clockwork. See REPETITION …   English dictionary for students

• isochronous — adj. isochronal, equal in time …   English contemporary dictionary

• isochronous — [ʌɪ sɒkrənəs] adjective 1》 occurring at the same time. 2》 occupying equal time. Derivatives isochronously adverb Origin C18: from mod. L. isochronus (from Gk isokhronos, from isos equal + khronos time ) + ous …   English new terms dictionary

• isochronous — isoch·ro·nous …   English syllables