The Digital Fact Book - Quantel

ETSI compressionA compression technique, based on DCT. Unlike MPEG, which is asymmetrical havingcomplex coders and simpler decoders and is designed for broadcast, this is symmetricalwith the same processing power at the coder and decoder. It is designed for applicationswhere there are only a few recipients, such as contribution links and feeds to cable headends. ETSI compression is intra-frame, simpler than MPEG and imposes less delay in thesignal path, typically 120 milliseconds against around a second, enabling interviews to beconducted over satellite links without unwarranted delays. Data rate is 34 Mb/s.eVTRA colloquial term for a Sony IMX VTR with an Ethernet connection.See also: D10EFEXORThe mathematical operation of EXclusive OR logic gate on a numberof data bits. Forexamplethe EXOR of two bits is 1, only if one of them is 1. The EXOR is widely used in data recovery(see RAID). If the EXOR of a number of blocks of data is stored, when one of those blocksis lost, its contents can be deduced by EXORing the undamaged blocks with the stored EXOR.See also: Error detectionExposureExposure refers to the amount of light that falls on a film or light sensor. In a camera thisis controlled by both time with the shutter, and the effective lens aperture, referred to asthe F-number or T number.See also: Density, StopFANFile Area Networks are a shared storage concept that stores shared files in multiple locations.However the user is not aware of where the files are located; they are simply accessed asif they were local or single site storage. The IT industry is actively pursuing this concept inorder to provide organizations with strategically central data sources that are geographicallyagnostic, which can lead to considerable resource savings.FANs also have potentially broad applications in post production and broadcast. It is notimpossible to imagine a post house with a ‘front door’ in the city where clients can comeand watch their job progress, driven by a creative at in his country retreat – perhaps withthe storage itself in a third location. Broadcasters with multiple sites (perhaps local stationsor subsidiaries) are also looking at FANs with great interest.Website: http://en.wikipedia.org/wiki/File_Area_Network83