Digital Projection Ltd. E-Vision Laser 13000 WU Series Appendix C:glossary of terms
H
HDCP (High-bandwidth Digital Content Protection)
An encryption scheme used to protect video content.
HDTV (High Definition Television)
A television system with a higher resolution than SDTV and EDTV. It can be transmitted in various formats, notably 1080p and 720p.
Hertz (Hz)
Cycles per second.
Horizontal Scan Rate
The rate at which the lines of the incoming signal are refreshed. The rate is set by the horizontal synchronization from the source and measured in Hertz.
Hs + Vs
Horizontal and vertical synchronization.
Hue
The graduation (red/green balance) of color (applicable to NTSC).
I
Interlacing
A method of updating the image. The screen is divided in two fields, one containing every odd horizontal line, the other one containing the even lines. The
fields are then alternately updated. In analog TV interlacing was commonly used as a way of doubling the refresh rate without consuming extra
bandwidth.
Interleaving
The alternation between left and right eye images when displaying 3D.
L
LED (Light Emitting Diode)
An electronic component that emits light.
Letterboxing
Black margins at the top and bottom of the image. Letterboxing appears when a wider image is packed into a narrower frame without changing the
original aspect ratio.
Lumen
A photometric unit of radiant power. For projectors, it is normally used to specify the total amount of emitted visible light.
Rev A June 2019
page 120
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