Digital Projection
HIGHlite 660 Series
APPENDIX C: GLOSSARY OF TERMS
Reference Guide
Ref 50
Rev A November 2012
Synchronization
A timing signal used to coordinate an action.
TheaterScope
An
aspect ratio
used in conjunction with a special
anamorphic lens
to display 2.35:1 images packed into a 16:9 frame.
Throw distance
The distance between the screen and the projector.
Throw ratio
The ratio of the
throw distance
to the screen width.
TRF (Throw ratio factor)
A special number used in calculating
throw distances
and
throw ratios
when the image does not fill the width of the
DMD™
.
The
throw ratio
for a particular lens is fixed but assumes that the image fills the width of the
DMD™
. For images that do fill the full width of
the
DMD™
, TRF = 1. For images that do not fill the
DMD™
, TRF is effectively increased.
UXGA
A display
resolution
of 1600x1200 pixels with a 4:3 screen
aspect ratio
. (Stands for
Ultra Extended Graphics Array
.)
Vertical Scan Rate
The rate at which the frames of the incoming signal are refreshed. The rate is set by the vertical
synchronization
from the source and
measured in
Hertz
.
Vignetting
Optical cropping of the image caused by the components in the projection lens. This can happen if too much offset is applied when
positioning the image using the lens mount.
Notes
