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MODULATED LIGHT SOURCE [2 records]

Record 1 2009-06-26

English

Subject field(s)
  • Audio Technology
  • Audiovisual Techniques and Equipment
DEF

The pattern formed by the spread of reflections from a modulated groove when a parallel beam of light is caused to fall normal to the surface of one or the other wall, and when the groove is viewed from the direction of the light source.

OBS

It is used as a measure of the maximum modulation of either wall of the groove in the calibration of the performance of recorders, and for the measurement of levels on test records.

French

Domaine(s)
  • Électroacoustique
  • Audiovisuel (techniques et équipement)

Spanish

Save record 1

Record 2 2007-03-14

English

Subject field(s)
  • Audiovisual Techniques and Equipment
  • Video Technology
DEF

A video display device in which a powerful light source is modulated by a ’valve’ controlled by a much smaller, less powerful one, thus making it possible to project a very large image.

OBS

The valve is a polarized liquid crystal device in which one surface reflects a powerful light in proportion to the amount of much weaker light falling on the reverse side. The controlling light can be an image created by a CRT [cathode ray tube]. Three valves, red, blue and green, are necessary for color projection.

French

Domaine(s)
  • Audiovisuel (techniques et équipement)
  • Vidéotechnique
DEF

Unité d'affichage vidéo intégrant une puissante source lumineuse contrôlée à l'aide d'un modulateur lui-même régulé par un autre modulateur de taille et de puissance plus réduites permettant de projeter une image très large.

OBS

Le modulateur de lumière est un dispositif à cristaux liquides polarisé comportant une surface réfléchissant la lumière suivant une puissance proportionnelle à la quantité de lumière de moindre puissance projetée sur la surface opposée. La lumière de contrôle peut être une image générée par un tube [cathodique]. Trois modulateurs (rouge, bleu et vert) sont nécessaires pour la projection couleur.

Spanish

Save record 2

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