AV/IT Glossary—27 Days of #AVabc—E





EDID—Extended Display Identification Data-EDID is a data structure used to communicate video display information, including native resolution and vertical interval refresh rate requirements, to a source device. The source device will then output the optimal video format for the display based on the provided EDID data, ensuring proper video image quality. This communication takes place over the DDC – Display Data Channel. It's what enables a modern personal computer to know what kinds of monitors are connected to it.



EAV—End of Active Video. A digital code used with digital component video signals, marking the end of a video line.

EBU—European Broadcasting Union. A European organization of broadcasters which among other activities, defines recommendations and statements for the 625/50 line television system.

Echo—Amazon Echo is a wireless speaker and voice command device from Amazon.com. The device consists of a 9.25-inch (23.5 cm) tall cylinder speaker with a seven-piece microphone array. The device responds to the name "Alexa"; this "wake word" can be changed by the user to either "Amazon" or "Echo".

Echo Cancellation—A DSP technique that filters unwanted signals caused by echoes from the main audio source.

Echo Suppression—Used in telephone networks to reduce the impact of echo and thereby improve voice quality. The impact of echo suppression is usually to limit data transmission to one direction at a time. In order to provide for duplex operation, modems request telephone systems to turn off echo suppression.

ECL—Emitter Coupled Logic. A family of high speed, low power IC logic devices. Also called “current mode logic.”

Edgeblending—A process used to combine images from two projectors or more for creating a large, combined image. The Scaler / Processor involved allows for overlapping edges on the projected images to be “blended” with no sign of “stitching”. The advantage of this process is that it creates large detailed images combining the pixel count of all projectors involved.

Edge-to-Edge—Describes common density factors in loudspeaker layout designs. Edge-to-edge density places the speakers such that the outside edges of their sound cones just touch one another.

EDH—Error Detecting and Handling-A system employing codes inserted in a digital video signal to detect possible errors and error rates.

EDID Minder®—A proprietary EDID management process from Extron. EDID Minder® automatically manages the EDID information between a digital display device and one or more input sources. By maintaining continuous EDID communication with all sources, EDID Minder® ensures that digital sources power up properly and maintain their video output, whether or not they are actively connected to the digital display device.

Editing Controller—A system to control and synchronize several VTRs, disk recorders, audio tape recorders and other accessories during postproduction*. An editing controller uses a dedicated computer, which is built into the controller.

EDTV—Enhanced Definition Television-A new digital TV product category added between High Definition TV (HDTV) and Standard Definition TV (SDTV), with the following attributes: a receiver that accepts ATSC terrestrial digital transmissions and decodes all ATSC Table 3 video formats; a display scanning format with active vertical scanning lines of 480 progressive (480p) or higher; no aspect ratio specified; and receives and reproduces, and/or outputs Dolby Digital audio.

EEPROM—Electrically Erasable Programmable Read-Only Memory-The information in an EEPROM is erased by exposing it to an electrical charge. Similar to EPROM except in the way in which information is erased. Also see "Flash memory."

EGA—Enhanced Graphics Adapter-Introduced by IBM in 1984, this replaced CGA (Color Graphics Adapter).

EMB—Effective Modal Bandwidth-In fiber optics, the modal bandwidth of a multimode fiber when using a laser as a light source. EMB is sometimes referred to as laser launch bandwidth.

Energy Management—Energy management includes planning and operation of energy production and energyconsumption units. Objectives are resource conservation, climate protection and cost savings, while the users have permanent access to the energy they need.

Ethernet—A system for connecting a number of computer systems to form a local area network, with protocols to control the passing of information and to avoid simultaneous transmission by two or more systems.

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