Runco Video Xtreme VX-40d Owner's Operating Manual page 103

Gain or Screen Gain
HDCP
HDTV
Help Text
Horizontal Frequency
Horizontal Offset
Hot Spot
Input
Input Signal
Interface
Interlace
Keypad
Keystone
Lamp Flicker
Linearity
Runco VX-40d/-50d/-60d/-80d Owner's Operating Manual
The ability of a screen to direct incident light to an audience. A flat matte white wall has
➤
a gain of approximately 1. Screens with gain less than 1 attenuate incident light; screens
with gain more than 1 direct more incident light to the audience but have a narrow viewing
angle. For example: An image reflecting off a 10 gain screen appears 10 times brighter
than it would if reflected off a matte white wall. Curved screens usually have larger gain
than flat screens.
High-bandwidth Digital Content Protection (HDCP) is a specification developed by the Intel®
➤
corporation for protecting digital entertainment content that uses a digital visual interface
(DVI). HDCP encrypts the transmission of digital content (signal) between the video source
and the digital display. HDCP does not prevent the copying or recording of digital content; it
only protects the integrity of content as it is transmitted.
High-definition Television (1035, 1080 and 1125 lines interlace, and 720 and 1080 line
➤
progressive formats with a 16:9 (i.e. 1.77) aspect ratio.
A display of help information regarding the current task or presentation.
➤
The frequency at which scan lines are generated, which varies amongst sources. Also called
➤
horizontal scan rate or line rate.
The difference between the center of the projected image and the center of the projector
➤
lens. For clarity, offset is often expressed as the maximum amount of the image that can
be projected to one side of the lens center without degrading the image quality. Horizontal
offset ranges can be affected by the type of lens in use, and whether or not the image is
offset vertically at the same time.
A circular area of a screen where the image appears brighter than elsewhere on the screen.
➤
A hot spot appears along the line of sight and "moves" with the line of sight. High gain
screens and rear screens designed for slide or movie projection usually have a hot spot.
A physical connection route for a source signal, described by a 2-digit number representing
➤
1) its switcher/projector location and 2) its slot in the switcher/projector.
Signal sent from a source device to the projector.
➤
A device, such as the Serial Digital Input Module, that accepts an input signal for display by
➤
the projector.
A method used by video tape players and some computers to double the vertical resolution
➤
without increasing the horizontal line rate. If the resulting frame/field rate is too low, the
image may flicker depending on the image content.
A small push-button device for controlling most projector settings and operation. For more
➤
information, refer to 3.3, Using the Keypad.
A distortion of the image which occurs when the top and bottom borders of the image
➤
are unequal in length. Side borders both slant in or out, producing a "keyhole" shaped
image. It is caused when the screen and lens surface are not parallel, or by poor Keystone
adjustment.
As the lamp ages, the shape of two anodes may change from two points to a flattened
➤
state. When this occurs, the arc jumps across the gap from varying points. This is seen as
image flicker. Turning the Lamp Conditioning feature ON will pulse the lamp and gradually
"condition" the two anodes back to two points. Lamp Conditioning may take seconds,
minutes or hours to reach full effectiveness. NOTE: Lamp flicker can occur at any time in
the lamps life. The length of time, over which flicker may occur varies considerably and
unpredictably. This behavior is inherent in UHP lamps.
The reproduction of the horizontal and vertical size of characters and/or shapes over the
➤
entire screen.
95
Appendix A: Glossary