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aliasing

French translation: repliement de spectre


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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:aliasing
French translation:repliement de spectre
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18:54 Dec 26, 2008
English to French 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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repliement de spectre
Definition:
recouvrement, repliement de spectre

En traitement du signal:
Spectre répété lors de l’échantillonnage et qui tombe dans le spectre occupé par le signal en bande de base rendant difficile une interprétation non ambiguë du signal régénéré.

En visualisation vidéo:
Apparition de crénelures sur les images traitées à cause d’une fréquence d’échantillonnage insuffisante (non respect du critère de Nyquist).
Selected response from:

xxxmediamatrix
Grading comment
4 KudoZ points were awarded for this answer



Summary of translations provided
5 +2repliement de spectrexxxmediamatrix
5distorsion de repliement
jacquestrad
5 -1crénelage
bagheera
4 -1repli de spectrestefani reynaud
4 -1Crénelageeric sawyer


Discussion entries: 2





  

Translations offered


51 mins   confidence: Answerer confidence 5/5 peer agreement (net): +2
repliement de spectre


Definition from European Broadcasting Union:
recouvrement, repliement de spectre

En traitement du signal:
Spectre répété lors de l’échantillonnage et qui tombe dans le spectre occupé par le signal en bande de base rendant difficile une interprétation non ambiguë du signal régénéré.

En visualisation vidéo:
Apparition de crénelures sur les images traitées à cause d’une fréquence d’échantillonnage insuffisante (non respect du critère de Nyquist).

Example sentence(s):
  • Les fréquences supérieures à la moitié de la fréquence d'échantillonnage introduisent un recouvrement spectral également appelé repliement. ... Afin d'éviter ce genre de désagréments, on effectue généralement un filtrage fréquentiel passe-bas avant l'opération d'échantillonnage proprement dite, que l'on appelle filtre anti-repliement (anti aliasing filter en anglais) dont la fréquence de coupure sera théoriquement égale à la plus haute fréquence correctement restituée, soit la moitié de la fréquence d'échantillonnage. - Wikipedia  
xxxmediamatrix
Local time: 19:55
Native speaker of: Native in EnglishEnglish
PRO pts in category: 74

Votes in favor of/against selecting this as the best translation of the term asked
Yes  Sawal: agree
2 hrs

Yes  erik b: d'accord. REPLIEMENT SPECTRAL.
15 hrs
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2 hrs   confidence: Answerer confidence 5/5 peer agreement (net): -1
crénelage


Definition from own experience or research:
syn de repliement de spectre

Example sentence(s):
  • C'est l'effet causé par la non-continuité des informations numériques dans une image. Le crénelage se manifeste sur les extrémités de l'image... - dictionnaire.phpmyvisites.net  
  • Effet visuel indésirable provoqué par l'insuffisance de la définition d'une image ou par un filtrage inadéquat des contours d'objets, et qui prend habituellement la forme de dentelures et de contours brisés. - http://gautier.ntic.fr/  
bagheera
Local time: 01:55
Native speaker of: Native in FrenchFrench

Votes in favor of/against selecting this as the best translation of the term asked
No  xxxmediamatrix: 'crénelage' and 'repliement de spectre' are not synonyms. The terms are translations of two types 'aliasing' that occur in quite different contexts, and they are manifested in different physical domains.
1 hr
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2 hrs   confidence: Answerer confidence 5/5
distorsion de repliement


Definition from [CILF. - Commission des sciences et tech:
Distorsion d'un signal, qui se produit lorsque la fréquence d'échantillonnage est insuffisante par rapport à la largeur de bande du signal, par suite du chevauchement des bandes latérales créées par l'échantillonnage autour des multiples de la fréquence d'échantillonnage.

Example sentence(s):
  • distorsion de repliement distorsion d'un signal qui se produit lors de son échantillonnage à une fréquence d'échantillonnage inappropriée et qui est due à un chevauchement des bandes latérales qui, dans le spectre du signal échantillonné, entourent les harmoniques de la fréquence d'échantillonnage - CEI Commission électrotechnique interna  
  • aliasing foldover distortion the distortion caused by sampling a signal at an inappropriate rate and which results in the overlapping of the sidebands around the harmonics of the sampling frequency in the spectrum of the sampled signal - IEC International Electrotechnical Comm  

Explanation:
Je suis ingénieur électrotechnicien
jacquestrad
Local time: 01:55
Native speaker of: Native in FrenchFrench

Votes in favor of/against selecting this as the best translation of the term asked
No  xxxmediamatrix: I hesitate to argue with IEC - but the term in the question refers to '... the production of artefacts ...', which is not the same as a 'distorsion'. The GBK question refers to the (unwanted) process, 'distorsion' refers to the perceived/measured result.
1 hr

Yes  eric sawyer: This is excellent. It is the exact definition of aliasing. Why didn't anyone open the IEC in the first place? (P.S. Mediamatrix, you seem to be referring to "ghosting"). Aliasing is a form of edge distorsion.
1 hr
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3 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): -1
Crénelage


Definition from alaide.com:
This is a "publisher" definition which confirms personal experience (studies and translation):
Non-desirable visual effect caused by insufficient definition of an image or by inadequate filtering of object contours, usually causing jagged edges and broken countours.
Effet visuel indésirable provoqué par l'insuffisance de la définition d'une image ou par un filtrage inadéquat des contours d'objets, et qui prend habituellement la forme de dentelures et de contours brisés.

Example sentence(s):
eric sawyer
Local time: 01:55
Native speaker of: Native in EnglishEnglish

Votes in favor of/against selecting this as the best translation of the term asked
No  xxxmediamatrix: That's only valid in the 'display' context (print, video displays, etc.).//Sorry - still 'No'. The origin is fundamental information theory, as expounded by Shannon and Nyquist. Digital TV came many decades later...
55 mins
  -> ALSO used in printing & displays. Origin is TV broadcasting -surely you know this, aliusing is CAUSED by spectrum overlap!- (le crénelage est le RESULTAT d'un repli(ement) de spectre"). Now also applies to video-conferencing of course.
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3 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): -1
repli de spectre


Definition from MentalWorks:
L'aliasing ( crènelage en français ou repli de spectre, pour sa définition technique) est un phénomène qui se produit lors du traitement numérique d'une image qui fait apparaître des angles saillants et des arêtes sur les éléments graphiques représentés dans l'image.
On utilise ce terme notamment dans le domaine de l'infographie ou du jeu vidéo pour décrire un rendu de moindre qualité qui présente des arêtes visibles et marquées surtout dans le cas d'une faible résolution d'affichage. On utilise souvent l'anglicisme aliasing pour définir ce phénomène et son paliatif, l'anti-aliasing, pour définir un algorithme qui corrige ce problème en ajoutant artificiellement des valeurs intermédiaires pour lisser artificiellement les arêtes.

Example sentence(s):
  • En plus d'une basse consommation, l'absence d'horloge permet de contourner deux phénomènes posant problème aux utilisateurs du DSP: le repli de spectre, aliasing en anglais, et les erreurs de quantification liées à l'inexactitude des amplitudes mesurées pendant l'échantillonnage du signal d'entrée. - Bulletins Electroniques  
  • Des motifs de moiré apparaissent souvent dans des images obtenues par numérisation d'images imprimées dans un magazine ou un journal. Ces motifs n'existent pas dans l'impression originale mais proviennent du repli de spectre des images en demi-teintes affichées. - Catalogue INIST-CNRS  
stefani reynaud
Local time: 01:55
Native speaker of: Native in EnglishEnglish, Native in FrenchFrench

Votes in favor of/against selecting this as the best translation of the term asked
No  xxxmediamatrix: The MentalWorks 'definition' (which is at best a mere 'explanation') is specific to the print/display industry. The question was posed in the field 'electronics/elect eng'.
55 mins
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