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MODULATION BANDWIDTH [11 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 - external organization data 2009-07-30

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.32 (19762)
ISO/IEC standard entry number
DEF

form of spread spectrum modulation in which the carrier frequency is automatically changed at short intervals, selection being made in a pseudo-random way from a set of frequencies covering a frequency band much wider than the bandwidth required for the information to be transmitted

OBS

Adapted from IEC 50 (725), 725-14-32.

OBS

frequency hopping spread spectrum modulation; FHSS: term, abbreviation and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

French

Spanish

Save record 1

Record 2 - external organization data 2009-07-30

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.29 (19762)
ISO/IEC standard entry number
DEF

modulation in which the average power spectral density of the transmitted signal is spread in a random or quasi-random way over a bandwidth which is much wider than the bandwidth required for the information to be transmitted [IEC 60050-725, 725-14-30]

OBS

Spread spectrum modulation permits multiple accesses to a communication path and increases immunity to noise and interference. [IEC 60050-725, 725-14-30]

OBS

spread spectrum modulation: term and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

French

Spanish

Save record 2

Record 3 2007-01-31

English

Subject field(s)
  • Telecommunications Transmission
DEF

The process of authorizing a specific frequency, group of frequencies, or frequency band to be used at a certain location under specified conditions, such as bandwidth, power, azimuth, duty cycle, or modulation.

CONT

Frequencies are assigned with due reference to the fact that spectrum resources are limited. Efficient spectrum use is ensured for example by geographical coordination of frequency assignments and by specifying terms for antenna height, transmitter power and modulation modes etc.

French

Domaine(s)
  • Transmission (Télécommunications)
DEF

Procédé d'autorisation d'une fréquence spécifique, d'un groupe de fréquences ou d'une bande de fréquences quelconque pour utilisation à un endroit donné dans des conditions précises.

CONT

Attribution de fréquences à la télédétection passive à partir de l'espace dans la bande 18,6-18,8 GHz.

Spanish

Campo(s) temático(s)
  • Transmisión (Telecomunicaciones)
Save record 3

Record 4 2004-08-27

English

Subject field(s)
  • Optical Telecommunications
CONT

Fiber optics depend on pulses of light, transmitted through fine transparent fibers, rather than on pulses of electric current sent through conducting wires. The purpose is to transmit information rather than power. By proper modulation of the light signals, a very wide information bandwidth can be achieved, and because the fibers can be made thin, a large bundle can be accommodated in a single cable of comparatively small diameter. The signals are not vulnerable to eavesdropping, nor are they susceptible to jamming or to transmission of damaging currents due to an electromagnetic pulse from a nuclear explosion. Fiber optics are replacing electric wires for many applications, including computer links.

French

Domaine(s)
  • Télécommunications optiques
DEF

Système optique utilisant des fibres optiques.

Spanish

Campo(s) temático(s)
  • Telecomunicaciones ópticas
Save record 4

Record 5 2004-04-22

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
DEF

A modulation technique used to widen the RF bandwidth of a signal.

OBS

Common types of SS modulation include frequency hopping, direct sequence, time hopping, and hybrid modulation.

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
DEF

Technique de transmission dans laquelle la puissance du signal émis est répartie sur une largeur de bande beaucoup plus grande que celle strictement nécessaire à la transmission des informations.

OBS

La modulation à spectre étalé permet l'accès multiple à une voie de transmission et accroît l'immunité au bruit et au brouillage radioélectriques, ainsi que la confidentialité.

Spanish

Campo(s) temático(s)
  • Guía radárica, radioguía y radiogoniometría
DEF

Sistema de modulación que utiliza una estructura de señal con características de ruido secuencial, por ejemplo, códigos de pseudoruido, para extender la señal de información normalmente de banda estrecha sobre una banda de frecuencias relativamente ancha.

OBS

El receptor correlaciona estas señales para recuperar la señal de información original.

Key term(s)
  • modulación SS
Save record 5

Record 6 2003-07-29

English

Subject field(s)
  • Telecommunications Transmission
  • Radio Transmission and Reception
CONT

The binary elements used for the phase modulation, usually called chips, are provided by a pseudo-noise(PN) generator, at a rate much higher than the data rate so that the bandwidth of the resulting signal is considerably expanded.

OBS

chip: term officially approved by the International Civil Aviation Organization (ICAO).

French

Domaine(s)
  • Transmission (Télécommunications)
  • Émission et réception radio
DEF

En radiocommunication numérique, partie temporelle du signal représentant un symbole, émise avec des caractéristiques distinctes de celles des autres parties du même signal, selon une loi déterminée.

CONT

Les éléments binaires utilisés pour la modulation de phase, appelés couramment chips, sont produits par un générateur pseudo-aléatoire à un débit très supérieur à celui des données transmises, de sorte que la largeur de bande du signal résultant est fortement augmentée.

OBS

Dans la modulation à spectre étalé à séquence directe, une bribe correspond à un élément de la suite superposée au signal à transmettre. Dans la modulation à spectre étalé à sauts de fréquence, une bribe correspond à l'intervalle de temps pendant lequel le signal reste sur une des fréquences porteuses.

OBS

chip : terme uniformisé par l'Organisation de l'aviation civile internationale (OACI).

Key term(s)
  • 4

Spanish

Campo(s) temático(s)
  • Transmisión (Telecomunicaciones)
  • Radiotransmisión y radiorrecepción
DEF

Un solo bit digital de la salida de una secuencia de bits seudoaleatorios. [Definición aceptada oficialmente por la OACI.]

OBS

elemento: término aceptado oficialmente por la Organización de Aviación Civil Internacional (OACI).

Save record 6

Record 7 2002-01-24

English

Subject field(s)
  • Internet and Telematics
  • Radioelectricity
  • Audio Technology
  • Telecommunications Transmission
DEF

The frequency range between direct current and the frequency where the depth of modulation is 50 percent(-3 decibel bandwidth).

French

Domaine(s)
  • Internet et télématique
  • Radioélectricité
  • Électroacoustique
  • Transmission (Télécommunications)
CONT

De cette façon, la largeur de bande de modulation de chaque porteuse peut être réduite tout en maintenant la même largeur de bande totale et une grande distance de transmission.

Spanish

Campo(s) temático(s)
  • Internet y telemática
  • Radioelectricidad
  • Electroacústica
  • Transmisión (Telecomunicaciones)
DEF

Gama de frecuencias entre la corriente continua y la frecuencia en la que la profundidad de modulación es 50 por ciento (ancho de banda de -3 decibelios).

Save record 7

Record 8 1985-06-28

English

Subject field(s)
  • Radio Transmission and Reception
  • Radiotelephony
DEF

distortion caused by lack of bandwidth, inadequate amplitude modulation rejection, or lack of linearity in the discriminator.

French

Domaine(s)
  • Émission et réception radio
  • Radiotéléphonie

Spanish

Save record 8

Record 9 1984-05-25

English

Subject field(s)
  • Radio Transmission and Reception
  • Telecommunications Transmission
DEF

the modulation used on the Cambridge Ring over twisted pair wires where the signals along each pair of wires are out of phase by one bit time. Phase modulation allows a greater bandwidth to be employed by transmitting a clock pulse separately from the data.

French

Domaine(s)
  • Émission et réception radio
  • Transmission (Télécommunications)

Spanish

Save record 9

Record 10 1981-08-28

English

Subject field(s)
  • Radioelectricity
  • Telecommunications
OBS

Frequency division multiplexing-frequency modulation(FDM-FM). FDM-FM is the most common method of transmission over radio systems. The radio channel spacing,(...), is usually specified using Carson's rule bandwidth(...)

French

Domaine(s)
  • Radioélectricité
  • Télécommunications
OBS

Multiplexage par répartition en fréquence et modulation de fréquence; MRF-MF. La méthode de transmission MRF-MF est la plus couramment employée sur les systèmes radioélectriques. L'écartement (...) des voies est généralement fixé d'après la largeur de bande déduite de la règle de Carson, (...)

Spanish

Save record 10

Record 11 1980-11-07

English

Subject field(s)
  • Telecommunications Transmission
DEF

... the maximum usable sensitivity for specified values of :-signal-to-noise ratio;-receiver bandwidth;-degree of modulation;-source impedance(dummy antenna).

French

Domaine(s)
  • Transmission (Télécommunications)
DEF

[...] la sensibilité maximale utilisable pour des valeurs déterminées : -du rapport signal/bruit;, -de la largeur de bande, -du taux de modulation et -de l'impédance de l'antenne fictive; [...]

Spanish

Save record 11

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