Extron Electronics DDS 100 - Manual (Page 51)

B-7 DDS 100 Reference Information
Glossary
BNC — Bayonet Neill-Concelman — A cable connector used
extensively in television and named for its inventor. A cylindrical
bayonet connector operates with a twist-locking motion. To make
the connection, align the two curved grooves in the collar of the
male connector with the two projections on the outside of the
female collar, push, and twist. This allows the connector to lock
into place without requiring tools.
Digital display scaler — See scaler.
Executive mode — Locks out all menu functions. When executive mode
is active, the centering controls and the RS-232 port remain active.
Freeze — Locks the output display to the current image. When the
freeze function is active, the freeze LED (light emitting diode) is lit.
High impedance — Hi Z or High Z — A relative term that is different
for each application. In video, when the signal is not terminated it
is said to have a Hi Z load. Hi Z is typically 800 — 10k ohms or
greater.
Horizontal filter — Controls the sampling of the horizontal plane,
thereby affecting the sharpness or smoothness of the scaled image.
Memory presets — Memory locations for storing preconfigured settings,
including size, zoom, pan, centering, and filter control settings for
various scan rates. Some presets can be stored by the user, and
others are set at the factory. The device automatically loads the
control settings from the preset associated with the scan rate of the
input video signal.
Reset — Erases user-specified settings that are stored in preset memory.
RS-232 — An Electronic Industries Association (EIA) serial digital
interface standard that specifies the characteristics of the
communication path between two devices using either DB-9 or
DB-25 connectors. This standard is used for relatively short-range
communications and does not specify balanced control lines.
RS-232 is a serial control standard with a set number of
conductors, data rate, word length, and type of connector to be
used. The standard specifies component connection standards
with regard to computer interface. It is also called RS-232-C,
which is the third version of the RS-232 standard.
Scaling — Changes the size of an image without changing its shape.
Scaling can be used when the image size does not fit the display
device. A digital display scaler converts a 1600 x 1280 resolution
image (from a high-resolution computer) to a size that can be
displayed through a digital display with limited resolution, such
as an LCD (liquid crystal display) projector, DLP (digital light
processing) projector, or plasma projector .
Vertical filter — Controls the number of lines to process, as well as the
way in which they are processed. This affects the sharpness and
flicker of a scaled image; as the flicker decreases, so does the
sharpness.