RGBLink VSP 729 - Manual (Page 20)

1. Introduction
Terms and Definitions
VSP 729 User Manual 20
transmission of moving image information such as motion video,
CD-quality audio, and control data at CD-ROM bandwidth. The MPEG
algorithm provides inter-frame compression of video images and can
have an effective compression rate of 100:1 to 200:1.
 “NTSC”: The color video standard used in North America and some
other parts of the world created by the National Television Standards
Committee in the 1950s. A color signal must be compatible with
black-and-white TV sets. NTSC utilizes an interlaced video signals,
525 lines of resolution with a refresh rate of 60 fields per second (60
Hz). Each frame is comprised of two fields of 262.5 lines each, running
at an effective rate of 30 frames per second.
 “PAL”: Phase Alternate Line. A television standard in which the phase
of the color carrier is alternated from line to line. It takes four full
pictures (8 fields) for the color-to-horizontal phase relationship to
return to the reference point. This alternation helps cancel out phase
errors. For this reason, the hue control is not needed on a PAL TV set.
PAL, in many transmission forms, is widely used in Western Europe,
Australia, Africa, the Middle East, and Micronesia. PAL uses 625-line,
50-filed (25 fps) composite color transmission system.
 “Operator”:
Refers to the person who uses the system.
 “PIP”: Picture-in-Picture. A small picture within a larger picture created
by scaling down one of the images to make it smaller. Each picture
requires a separate video source such as a camera, VCR, or computer.
Other forms of PIP displays include Picture-by-Picture (PBP) and
Picture-with-Picture (PWP), which are commonly used with 16:9
aspect display devices. PBP and PWP image formats require a
separate scaler for each video window.
 “Polarity”: The positive and negative orientation of a signal. Polarity
usually refers to the direction or a level with respect to a reference (e.g.
positive sync polarity means that sync occurs when the signal is going
in the positive direction).
 “RJ-45”: Registered Jack-45. A connector similar to a telephone
connector that holds up to eight wires, used for connecting Ethernet
devices.
 ―RS-232”: An Electronic Industries Association (EIA) serial digital
interface standard specifying 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 communication 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 the computer interface. It is also
called RS-232-C, which is the third version of the RS-232 standard,
and is functionally identical to the CCITT V.24 standard.
 “Saturation”: Chroma, chroma gain. The intensity of the color, or the
extent to which a given color in any image is free from white. The less
white in a color, the truer the color or the greater its saturation. On a
display device, the color control adjusts the saturation. Not to be