levision, the process of creating a complete video frame by dividing the picture into two halves with one containing the odd lines and the other containing the even lines. This is done to eliminate flicker. field of view The focal length combined with the size of the image area light is focused on. Field of view is measured in degrees and is not dependent on the distance from a subject. field sequential system The first broadcast color television system, approved by the FCC in 1950. It was later changed to the NTSC standard for color broadcasting. A set of related records treated by a computer as a complete unit. Retrieving information from one computer memory storage facility to another is called a file transfer. FireWire A high-speed serial bus that Apple Computer and Texas Instruments developed that allows for the connection of up to 63 devices. Also known as the IEEE 1394 standard, it provides 100, 200, 400, 800, 1600, and 3200 Mbps transfer rates. FireWire supports isochronous data transfer, and thereby guarantees bandwidth for multimedia operations. It supports hot swapping and multiple speeds on the same bus. FireWire is used increasingly for attaching video devices to the computer. filter An electrical circuit or device that passes a selected range of energy while rejecting all others that are not in the proper frequency range. firmware Programs or data that are stored on a semiconductor memory circuit, often a plug-in board. Firmware- stored memory is non-volatile. Fiber in the loop. A Bellcore technical advisory, number 909, Issue 2, which addresses the ability of telephone companies to provide video services and Glossary of Terms delivery using optical fiber cable. FlexMux The synchronized delivery of streaming data may require the use of different QoS schemes as it traverses multiple public and private networks. MPEG defines the delivery-layer FlexMux multiplexing tool to allow grouping of Elementary Streams (ES) with low multiplexing overhead. It may be used to group ES with similar QoS requirements,