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Terms and Glossary

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Emergency Alert System. A broadcast warning system in the United States that either interrupts normal broadcasting, or displays an alert which crawls across the video picture. EAS alerts also contain an audible alert message


Abbreviation for "End of Active Video". A digital synchronization sequence consisting of a sequence of four consecutive code words (a code word of all ones, a code word of all zeros, another code word of all zeros, and a code word including F (field/frame), V (vertical), H (horizontal), P3, P2, P1, and P0 (parity) bits.) which is used to designate the start of the horizontal blanking interval of the digital line. See also SAV


European Broadcasting Union. EBU is an organisation of European broadcasters that among other activities provides technical recommendations for the 625/50 line television systems


The EBU recommendation for the parallel interface of 625 line digital video signal. This is a revision of the earlier EBU Tech 3246-E standard, which was in turn derived from ITU-R601


Error Detection and Handling (EDH) is defined in SMPTE RP 165 as a method of determining when bit errors have occurred along the digital video path. According to RP 165, two error detection checkwords are used, one for active picture samples, and the other on a full field of samples. Three sets of flags are used to convey information regarding detected errors, to facilitate identification of faulty equipment or cabling. One set of flags is associated with each checkword, and the third is used to evaluate ancillary data integrity. The checkwords and flags are combined into a special error detection data packet that is included as ancillary data in the serial digital signal

Edit Controller

Electronic console which allows the EDITOR to assemble or insert sections of a programme. Special effects and other ancilliary equipment may be controlled by this unit.

Edit Decision List (EDL)

A file that describes an edit sequence in terms of a file reference and in/out time-codes. It can be used to share an edit sequence or to transfer edit decisions from offline to online (low-res to high-res). A modern example is the AAF, which can also contain a much richer set of metadata such as effects parameters and caption text.


Assembling a programme by transposing or combining separate recorded sequences either by physically cutting and splicing tape (audio or film) or selective electronic copying.

Editing Equipment

Equipment used to compile a finished program from tapes and other sources.


Person responsible for assembling sections of often non-sequentially shot action and sound into a coherent pattern which reflects the vision of the DIRECTOR.


Electronic Field Production similar to ENG but often with multiple cameras.


A Closed Caption standard for SD-SDI television signals


A Closed Caption standard for HD-SDI television signals


Similar to a condenser microphone but with a permanent charge on the foil so avoiding the need for a polarising voltage.


Digital audio is multiplexed onto a serial digital video data stream according to the SMPTE 272M (standard definition) or SMPTE 299M (high definition) standards


The process of combining one type of signal with another such that both signals can be transmitted using the standard of just one. This term is often used to describe the process of inserting AES audio into a serial digital video signal


A mathematical technique for scrambling information such that only those with a key piece of information can unscramble the information to recreate the original message.


Electronic News Gathering.

Enhanced television

Any of several techniques for providing a viewer with additional information associated with a television program or advertisement.


A protocol for connecting computers over a Local Area Network (LAN)


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