Appendix A • Reference Information
SECAM – Sequential Couleur Avec Memoiré – Translated as “Sequential Color with Memory”. A composite color transmission system that potentially eliminates the 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 output 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
SMPTE – Society of Motion Picture and Television Engineers – A global organization, based in the United States, that sets standards for
SMPTE Pattern – The video test pattern made up of color, black, and white bands used by television stations.
Software – The programs used to instruct a processor and its peripheral equipment.
Switcher – Term often used to describe a special effects generator; a unit which allows the operator to switch between video camera signals. Switchers are often used in industrial applications to switch between video camera monitoring certain areas for display on a monitor, or system of display devices. These kinds of switchers do not have sync generators.
Sync – In video, a means of synchronizing signals with timing pulses to insure that each step in a process occurs at exactly the right time. For example: Horizontal Sync determines exactly when to begin each horizontal line (sweep) of the electron beam. Vertical Sync determines when to bring the electron beam to the
SVHS – A high band video recording process for VHS that increases the picture quality and resolution capability. See
Terminal – A device typically having a keyboard and display that is capable of sending text to and receiving text from another device, a network, etc.
Termination – A load, or impedance at the end of a cable or signal line used to match the impedance of the equipment that generated the signal. The impedance absorbs signal energy to prevent signal reflections from going back toward the source. In the video industry, termination impedance is typically 75 ohms.
Vertical Interval – The synchronizing information which is presented between fields, and then signals the picture monitor to return to the top of the screen to start another vertical scan.
Videoconferencing — Conducting a conference between two or more locations using video cameras, microphones and video monitors. The participants can be seen, as well as heard. Referred to as a “virtual conference room”.
Virtual conference room — See videoconferencing.
Virtual map — Used with Extron’s virtual matrix switchers (Matrix 3200/6400), a virtual map is made up of tables stored in memory that relate physical connectors (as on the back panel) to logical connections (as seen by the user). In printed form, this can show physical input/output connector numbers as they relate to virtual input/output numbers.
Virtual memory — The process of increasing the apparent size of a computer’s random- access memory (RAM) by using a section of the hard disk storage as an extension of RAM.
Virtual switching — A means of making real, physical input or output ports appear to have different numbers. For example, Extron’s Matrix 3200/6400 switchers can be programmed to switch a set (group) of connectors as one. Also see virtual map.
Wideband – A relative term indicating a high bandwidth.
Y – In video, “Y” is an abbreviation for Luminance.
Z – A symbol for impedance.
Extron • Matrix 3200/6400 Series • User’s Manual |
