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DIA-LUMINANCE [1 record]

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Record 1 2007-01-09

English

Subject field(s)
  • Audiovisual Techniques and Equipment
  • Television (Radioelectricity)
DEF

A grainy "zipper" effect along boundaries of colored objects on [a TV] screen or a silk screen effect within color patches.

OBS

It occurs when color information in a composite video signal is not removed before the signal is passed on to the luminance circuits.

OBS

This situation is the result of imperfect Y/C separation by the comb filter (or notch and bandpass filters in less expensive TV sets), where color information finds its way into the luminance circuits.

French

Domaine(s)
  • Audiovisuel (techniques et équipement)
  • Télévision (Radioélectricité)
DEF

Phénomènes parasites qui se produisent dans la partie de [...] luminance de l’image et [de l’écran de télévision] qui sont dus à la diachromie de l’information de couleur qui se produit dans le canal de luminance.

OBS

[Ces parasites ont la forme d’une] chaîne de petites «perles» incolores situées aux bords des zones colorées. Des circuits élaborés (filtres à peigne) permettent de réduire ce phénomène.

OBS

Ce phénomène se produit avec les systèmes d’émission conventionnels utilisés en analogique : PAL, SECAM et NTSC.

Spanish

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