Extron • System 8/10 P
LUS
• User’s Manual
Reference
Glossary of Terms
B-18
Power (Electrical) – The dissipation of heat by passing a current through a resistance. Measured in
Watts (W), it is expressed by Ohm’s law from the two variables: Voltage (E) and
Current (I). i.e. P = I
2
xR, or, P = E
2
/R or P = ExI
Progressive Scan – See non-interlaced.
Resolution – The density of lines or dots that make up an image. Resolution determines the
detail and quality in the image. (units per distance or units per area)
A) A measure of the ability of a camera or video system to reproduce detail.
B) In video, generally called horizontal resolution. It can be evaluated by
establishing the limit to which lines can be distinguished on a test pattern. A
higher resolution value means a broader frequency band of the video signal.
C) A measure of the amount of detail that can be seen in an image. Often
incorrectly expressed as a number of pixels; more correctly it is the bandwidth.
RGB ( Red, Green, Blue) – The basic components of the color television system. They are also the primary
colors of light, not to be confused with Cyan, Magenta, and Yellow, the primary
pigments. Also called the “Additive Color Process”.
RGB Video – A form of color video signal (red, green, blue) distinctly different from the
composite color video used in standard television sets. RGB can be displayed
only on a color monitor that has a separate electron gun for each of these
primary colors. Some color television sets use only one gun. RGB monitors are
noted for their crisp, bright colors and high resolution. RGB Video can be three
different ways: RGsB (sync is on the green signal), RGBS (sync is separate from
the colors) and RGBHV (sync is separate from the colors and the horizontal and
vertical are separate signals).
RS-232 – An Electronic Industries Association (EIA) serial digital interface standard
specifying the characteristics of the communication path between two devices
using D-type connectors. This standard is used for relatively short range
communications and does not specify balanced control lines.
RS-422 – An EIA serial digital interface standard which specifies the electrical
characteristics of balanced voltage digital interface circuits. This standard is
usable over longer distances than RS-232. It is also used as the serial port
standard for Macintosh computers. This signal governs the asynchronous
transmission of computer data at speeds of up to 920,000 bits per second.
Scan Converter – Also called “video converter” or “TV converter”, a scan converter is a device that
changes the scan rate of a source video signal to fit the needs of a display
device. Examples: computer-video to NTSC (TV), or NTSC to computer-video.
SECAM – (Sequential Couleur Avec Memoiré) – Translated as “Sequential Color with
Memory”. A composite color transmission system that potentially eliminates a
need for both a color and hue control on the monitor. One of the color difference
signals is transmitted on one line and the second is transmitted on the second
line. Memory is required to obtain both color difference signals for color
decoding. This system is used in France, Africa, Asia and many Eastern
European countries.
Serial Port – An input/ouput connection on the computer that allows it to communicate with
other devices in a serial fashion – data bits flowing on a single pair of wires. The
serial port is most often used with RS-232 protocol.
SMPTE – (Society of Motion Picture and Television Engineers) – A global organization,
based in the United States, that sets standards for baseband visual
communications. This includes film as well as video standards.
SMPTE Pattern – The video test pattern made up of color, black and white bands.
Still – In video, the term “still” is used as opposed to “motion” because there can be a
difference in the way these two types of video are processed for the best viewing
results, especially when the video is line-doubled or line-quadrupled. Still video
includes text and slide presentations, while motion would include movies and TV
programs. See Motion.
im Vertrieb von
CAMBOARD Electronics
www.camboard.de
Tel. 07131 911201
Fax 07131 911203
ce-info@camboard.de
