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FREQUENCE NYQUIST [6 records]
Record 1 - internal organization data 2024-02-22
Record 1, English
Record 1, Subject field(s)
- Telecommunications Transmission
Record 1, Main entry term, English
- baseband pulse transmission 1, record 1, English, baseband%20pulse%20transmission
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record 1, French
Record 1, Domaine(s)
- Transmission (Télécommunications)
Record 1, Main entry term, French
- transmission d’impulsion en bande de base
1, record 1, French, transmission%20d%26rsquo%3Bimpulsion%20en%20bande%20de%20base
feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 OBS
Si on échantillonne un signal tous les T secondes, on ne peut reconstituer un signal dont la fréquence est supérieure à 1/2 T(théorème de Nyquist). La bande de fréquence de 0 à 1/2 T est appelée «bande de base». 1, record 1, French, - transmission%20d%26rsquo%3Bimpulsion%20en%20bande%20de%20base
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2010-06-14
Record 2, English
Record 2, Subject field(s)
- Telecommunications
- Electrical Engineering
- Television (Radioelectricity)
Record 2, Main entry term, English
- Nyquist frequency
1, record 2, English, Nyquist%20frequency
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
The bandwidth of a sampled signal and is equal to half of the sampling frequency of that signal. 1, record 2, English, - Nyquist%20frequency
Record 2, French
Record 2, Domaine(s)
- Télécommunications
- Électrotechnique
- Télévision (Radioélectricité)
Record 2, Main entry term, French
- fréquence de Nyquist
1, record 2, French, fr%C3%A9quence%20de%20Nyquist
correct, feminine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 CONT
Pour qu'un signal ne soit pas perturbé par l'échantillonnage, la fréquence d’échantillonnage doit être supérieure au double de la plus haute fréquence contenue dans le signal. Cette fréquence limite s’appelle la fréquence de Nyquist. 1, record 2, French, - fr%C3%A9quence%20de%20Nyquist
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 2008-05-16
Record 3, English
Record 3, Subject field(s)
- Telecommunications
- Electrical Engineering
- Television (Radioelectricity)
Record 3, Main entry term, English
- sub-Nyquist sampling
1, record 3, English, sub%2DNyquist%20sampling
correct, standardized
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 OBS
sub-Nyquist sampling: term standardized by the International Electrotechnical Commission. 2, record 3, English, - sub%2DNyquist%20sampling
Record 3, French
Record 3, Domaine(s)
- Télécommunications
- Électrotechnique
- Télévision (Radioélectricité)
Record 3, Main entry term, French
- échantillonnage inférieur au taux de Nyquist
1, record 3, French, %C3%A9chantillonnage%20inf%C3%A9rieur%20au%20taux%20de%20Nyquist
masculine noun
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, Textual support number: 1 DEF
Échantillonnage effectué à une fréquence inférieure à la fréquence de Nyquist. 2, record 3, French, - %C3%A9chantillonnage%20inf%C3%A9rieur%20au%20taux%20de%20Nyquist
Record 3, Key term(s)
- échantillonnage au-dessous de la limite de Nyquist
Record 3, Spanish
Record 3, Campo(s) temático(s)
- Telecomunicaciones
- Electrotecnia
- Televisión (Radioelectricidad)
Record 3, Main entry term, Spanish
- muestreo sub-Nyquist
1, record 3, Spanish, muestreo%20sub%2DNyquist
correct, masculine noun
Record 3, Abbreviations, Spanish
Record 3, Synonyms, Spanish
Record 3, Textual support, Spanish
Record 4 - internal organization data 1996-10-30
Record 4, English
Record 4, Subject field(s)
- Acoustics (Physics)
- Telecommunications Transmission
- Video Technology
Record 4, Main entry term, English
- alias
1, record 4, English, alias
correct
Record 4, Abbreviations, English
Record 4, Synonyms, English
Record 4, Textual support, English
Record number: 4, Textual support number: 1 DEF
An ambiguity in the frequency represented by sampled seismic data. Where there are fewer than two samples per cycle, an input signal at one frequency yields the same sample values as, and hence appears to be, another frequency at the output of the system. Half of the frequency of sampling is called the "folding" or "Nyguist" frequency, fN;a frequency larger than this, fN+Y, appears to be the smaller frequency, fN-Y. The two frequencies are "aliases" of each other. 2, record 4, English, - alias
Record 4, Key term(s)
- folding frequency
- Nyquist frequency
Record 4, French
Record 4, Domaine(s)
- Acoustique (Physique)
- Transmission (Télécommunications)
- Vidéotechnique
Record 4, Main entry term, French
- fréquence repliée
1, record 4, French, fr%C3%A9quence%20repli%C3%A9e
correct, feminine noun
Record 4, Abbreviations, French
Record 4, Synonyms, French
- alias 2, record 4, French, alias
correct, masculine noun
- reflet 1, record 4, French, reflet
masculine noun
Record 4, Textual support, French
Record number: 4, Textual support number: 1 DEF
Composante en miroir du signal, résultant d’un échantillonnage à une fréquence inférieure à la fréquence de Nyquist. 3, record 4, French, - fr%C3%A9quence%20repli%C3%A9e
Record number: 4, Textual support number: 1 OBS
L'échantillonnage du signal provoque une ambiguïté sur les fréquences, à cause des phénomènes de repliement du spectre. [...] On peut montrer qu'il n’ y a pas de phénomène de repliement si l'on s’arrange pour ne pas avoir de signal à des fréquences supérieures à la fréquence de Nyquist(moitié de la fréquence d’échantillonnage). 4, record 4, French, - fr%C3%A9quence%20repli%C3%A9e
Record 4, Spanish
Record 4, Textual support, Spanish
Record 5 - internal organization data 1988-03-29
Record 5, English
Record 5, Subject field(s)
- Cybernetic Systems
Record 5, Main entry term, English
- turnover frequency
1, record 5, English, turnover%20frequency
correct
Record 5, Abbreviations, English
Record 5, Synonyms, English
- Nyquist frequency 1, record 5, English, Nyquist%20frequency
correct
Record 5, Textual support, English
Record 5, French
Record 5, Domaine(s)
- Systèmes cybernétiques
Record 5, Main entry term, French
- fréquence de Nyquist
1, record 5, French, fr%C3%A9quence%20de%20Nyquist
correct, feminine noun
Record 5, Abbreviations, French
Record 5, Synonyms, French
Record 5, Textual support, French
Record number: 5, Textual support number: 1 OBS
En analyse de Pourier. 1, record 5, French, - fr%C3%A9quence%20de%20Nyquist
Record 5, Spanish
Record 5, Textual support, Spanish
Record 6 - internal organization data 1977-06-18
Record 6, English
Record 6, Subject field(s)
- Vulcanology and Seismology
- Geophysics
- Geological Research and Exploration
Record 6, Main entry term, English
- alias filter
1, record 6, English, alias%20filter
correct
Record 6, Abbreviations, English
Record 6, Synonyms, English
- anti-alias filter 1, record 6, English, anti%2Dalias%20filter
correct
Record 6, Textual support, English
Record number: 6, Textual support number: 1 OBS
A filter used before sampling to remove undesired frequencies which the sampling process would otherwise alias. An alias filter should have linear phase response and nearly flat amplitude response over the signal passband and should roll off rapidly above this band to provide high attenuation above the Nyquist frequency (.,..) Also called an anti-alias filter. 1, record 6, English, - alias%20filter
Record 6, French
Record 6, Domaine(s)
- Volcanologie et sismologie
- Géophysique
- Recherches et prospections géologiques
Record 6, Main entry term, French
- filtre antialiasing
1, record 6, French, filtre%20antialiasing
correct
Record 6, Abbreviations, French
Record 6, Synonyms, French
Record 6, Textual support, French
Record number: 6, Textual support number: 1 OBS
Afin d’éviter ces phénomènes, il est donc nécessaire de filtrer l'enregistrement avant l'échantillonnage afin de l'épurer de toutes les fréquences supérieures à la fréquence de Nyquist. On utilise à cet effet un filtre à pente raide, dit filtre antialiasing, dont la fréquence est naturellement adaptée à l'échantillonnage. 1, record 6, French, - filtre%20antialiasing
Record 6, Spanish
Record 6, Textual support, Spanish
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