1. Introduction
Terms and Definitions
(25 fps) composite color transmission system.
“Operator”:
Refers to the person who uses the system.
“PIP”:
image-in-image. A small image within a larger image created by
scaling down one of the images to make it smaller. Each image
requires a separate video source such as a camera, VCR, or computer.
Other forms of PIP displays include image-by-image (PBP) and
image-with-image (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
confused with the brightness, saturation is the amount of pigment in a
color, and not the intensity. Low saturation is like adding white to the
color. For example, a low-saturated red looks pink.
“Scaling”:
A conversion of a video or computer graphic signal from a
starting resolution to a new resolution. Scaling from one resolution to
another is typically done to optimize the signal for input to an image
processor, transmission path or to improve its quality when presented
on a particular display.
“SDI”:
Serial Digital Interface. The standard based on a 270 Mbps
transfer rate. This is a 10-bit, scrambled, polarity independent interface
with common scrambling for both component ITU-R 601 and
composite digital video and four channels of (embedded) digital audio.
“Seamless Switching”:
A feature found on many video switchers. This
