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视音频专业术语表

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视音频专业术语表(21)

2017-02-13 09:15 admin 人关注

A B C D E F G H I  J K L M N O P Q R S T U V W X Y Z

U
UDP (User Datagram Protocol) - A connectionless protocol providing “best effort” delivery of packets across networks. UDP is frequently used in real-time streaming applications were best effort delivery is acceptable and the network devices and applications manage data flow control and errors.
UHF - Ultra High Frequency. A television broadcast frequency range between 300 and 3000 MHz on channels 14 through 83. Also the name for a type of connector used for video cables.
UL® - Underwriters Laboratories. When marked by the UL symbol, a product has been tested and evaluated according to nationally recognized safety standards with regard to fire, electric shock, and related safety hazards. There is also a UL for Canada, sometimes called CUL, and a UL recognized component with its own symbol, resembling a backward "UR."
Ultra Physical Contact – UPC - In fiber optics, a specific endface polish for a connector to achieve typically a -60 dB return loss in singlemode applications. UPC has become the most common polish for fiber optic connectors in digital applications. UPC polished connectors can be used with PC or SPC polished connectors but are not compatible with APC polished connectors. Intermixing APC polished connectors with UPC/SPC/PC polished connectors can damage the fiber optic cable or equipment. Multimode applications always use PC, SPC, or UPC polished connectors.
Unbalanced audio - An audio output where one of the two output terminals is at ground potential.
Underfilled Launch Condition – ULC - In fiber optics, a condition where the incoming light only fills a small percentage of the fiber core.
Underscan - A decreasing of the raster size (H and V) so that all four edges of the picture are visible on the screen. Underscanning allows viewing of skew and tracking that would not be visible in normal (overscanned) mode. It is also helpful when aligning test charts to be certain they touch all four corners of the raster. Likewise, when checking the alignment of multiplexer images from a film chain, underscan allows proper framing of the projected image going into the video camera.
Unicast - The sending of messages to a single network destination host on a packet switching network. Sending a separate copy of the media stream from the server to each recipient.
UPS - Uninterruptible Power Supply. A power supply that continues to provide voltage for a limited time after the main power is off (fails).
URL - Uniform Resource Locator. This is the address that lets a resource on the internet be identified, located, and accessed
USB - Universal Serial Bus. USB was developed by seven PC and telecom industry leaders (Compaq, DEC, IBM, Intel, Microsoft, NEC, and Northern Telecom). The goal was easy plug-and-play expansion outside the box, requiring no additional circuit cards. Up to 127 external computer devices may be added through a USB hub, which may be conveniently located in a keyboard or monitor. USB devices can be attached or detached without removing computer power. The number of devices being designed for USB continues to grow, from keyboards, mice, and printers to scanners, digital cameras, and ZIP drives.
USB 1.1 - Universal Serial Bus 1.1. An external bus standard that supports data transfer rates of 12Mbps and 1.5Mpbs. A single USB port can connect up to 127 peripheral devices. Also see "USB 2.0."
USB 2.0 - Universal Serial Bus 2.0. An external bus standard that supports data transfer rates up to 480Mbps, 12Mpbs, and 1.5Mpbs. USB 2.0 is an extension of USB 1.1 and is backward compatible with USB 1.1, using the same cables and connectors. Also see "USB 1.1."
UV - Ultraviolet. Light/heat rays that have a shorter wavelength (and higher frequency) than those in the visible spectrum. UV rays are ordinarily filtered or blocked to prevent eye damage and dye fading.
UXGA - Ultra Extended Graphic Array. 1600 x 1200. A UXGA display has 1600 horizontal pixels and 1200 vertical pixels giving a total display resolution of 1,920,000 individual pixels that are used to compose the image delivered by a projector.
 

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