aliasing

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14:58 Nov 24, 2009

English to Latvian translations [PRO]
Tech/Engineering - Telecom(munications)
Additional field(s): Electronics / Elect Eng

English term or phrase: aliasing

Definition from ATIS Telecom Glossary 2007:
In any technology or process involving (a) sampling a signal, e.g., an electrical signal or (a series of images of) a moving subject; (b) processing, storing, or transmitting representations of the samples; and (c) replicating the original signal from the representations: the production of artifacts as a result of sampling at intervals too great to permit faithful replication of the original signal.

Example sentence(s):

Digital alias-free signal processing (DASP) is a technique for overcoming the problems of aliasing at extended frequency ranges. Based on non-uniform or randomised sampling techniques and the development of novel algorithms, it creates the capacity to suppress potential aliasing crucial for high frequency applications and to reduce the complexity of designs. Wiley
An example of aliasing can be seen in old movies, especially when watching wagon wheels on old Western films. Recall that occasionally the wheels appeared as if they going in reverse, even as the wagon would speed up. This phenomenon occurs as the rate of the wagon wheel's spokes spinning approaches the rate of the sampler (the camera operating at about 30 frames per second). National Instruments
The term aliasing refers to the distortion that occurs when a continuous time signal has frequencies larger than half of the sampling rate. The process of aliasing describes the phenomenon in which components of the signal at high frequencies are mistaken for components at lower frequencies. Sampling and Aliasing

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Summary of translations provided

4 +1

spektrālā kropļošanās

Biruta MARKO

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spektrālā kropļošanās

Definition from Terminoloģijas portals:
Process, kurā analogciparu pārveides laikā rodas informācijas kropļojums, ja iztveramajā skaņas signālā vai attēlā ietilpst komponentes, kuru frekvence ir lielāka par t.s. Naikvista frekvenci jeb pusi no frekvences, kādā veic iztveršanu. Radušies traucējumi attēlā ir vērojami kā muarē raksts, bet skaņā – kā liekas frekvences.

Example sentence(s):

Gatavojot analogos signālus, jāņem vērā filtra amplitūdas pavājināšanās un paraugu ņemšanas biežums, lai novērstu spektrālās kropļošanās kļūdas, un filtra fāžu kavēšanās un laika nobīdes. - Mt-EURO-Lex

Biruta MARKO
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