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The variation in position of a signal’s transition occurring at a rate of less than 10 Hz.


Wide Area Information Server. A client-server information system that let's users search through databases with a single user interface.


 Wide Area Network. A network that connects computers over a large geographic area.


Widely used to denote cracked or pirate versions of commercial software. In other words, illegal pirated software.


The unit of electrical power. Watts are calculated by multiplying Voltage by the Current in both DC and AC circuits without reactance. Another way of calculating power is to multiply resistance or Impedance in Ohms by the square of the current. This is normally shown as I2R=Power. See Ohm's law.

WAVV (pronounced wave):

The Windows-compatible audio file format. The WAV file can be recorded at 11 kHz, 22 kHz, and 44 kHz, and in 8- or 16-bit mono and stereo.
see also:AIF, AU.

Wave Length

The distance between peaks in a sinusoidal wave. Each part of the electromagnetic radiation spectrum (e.g. radio waves, microwaves, x-rays, etc.) exhibit a specific wavelength. Each part of the visible spectrum (what the human eye sees) has a specified wavelength (perceived as color).

Waveform Monitor

A special-purpose oscilloscope that offers a graphical display of the amplitude-versus-time view of the video signal under test.  Waveform monitor views are an excellent means to evaluate and measure various video signal characteristics.

Wavelet-Based Compression

An asymmetrical image compression technique that is scalable and can provide high quality. The drawback is that it becomes more computationally expensive as the picture resolution and frame rates go up. The encode and decode are asymmetrical in that one side is a lot more expensive computationally than the other. The ImMix Cube and TurboCube used wavelet-based compression.


Periodic sideways movement of the image as a result of mechanical faults in camera, printer projector or telecine.


WebTV Networks, Inc. is a leading manufacturer of set-top boxes used for viewing interactive television and regular television. These receivers let users access the Internet, including use of electronic mail and online chats. WebTV set-top boxes like the WebTV Plus Receiver connect to a standard television and a phone line. The WebTV Plus Receiver supports TV Crossover Links and WebPIP. WebPIP lets users simultaneously view Web pages and TV programming on the same screen, without a special picture-in-picture TV. WebTV is a trademark and service of the Microsoft Corporation.

Wet Gate

A system by which film is temporarily coated with a layer of liquid at the moment of transfer to reduce the effect of surface faults such as scratches. Originally a laboratory printing process, it is now also be available on telecines. Also known as “Liquid Gate”

White Balance

A switch on a TV camera activated manually while the camera is pointed at a pure white surface-used to set white level.  Setting the white balance of a camera ensures that white is truly shown as white, and not biased to an off-white color affected by local lighting conditions. For example, indoor fluorescent lighting typical makes white objects look bluish if the camera is not "white balanced" for that type of illumination.

A means of adjusting the color balance of a camera. With still video cameras, white balance is automatically achieved via a special white balance sensor as the subject is photographed.

White Clip

Camera circuit which limits the amplitude of the signal to a specified level removing any highlights in excess of this level. The NTSC signal, when it is intended for broadcast, has a maximum allowable amplitude of 100 IRE units or 1 Volt. It is possible for the amplifiers in most cameras to easily produce signals that exceed this level. The clip circuit removes all information above a user-established level when the camera is adjusted—usually around 104 IRE.

White Level

Refers to the camera control to set the luminance level for a color camera.  Also refers to the 100 IRE mark in video, where the luminance is fully "white" on a TV display.


A means of looking up names in a remote database. Used initially as an aid for finding e-mail addresses for people at large institutions or companies.


Used typically to describe a signal which has a bandwidth of 20 kHz or greater(analog video signals have bandwidths of greater than 4MHz).


Term given to picture displays that have a wider aspect ratio than normal. For example TV's normal aspect ratio is 4:3 and widescreen is 16:9. Although this is the aspect ratio used by HDTV, widescreen is also used with normal definition systems.


A character string that is used in text searches to make finding a match easier. An asterisk (*) usually means find any character or set of characters.


1. Video containing information or allowing information entry, keyed into the video monitor output for viewing on the monitor CRT. A window dub is a copy of a videotape with time code numbers keyed into the picture. 2. A video test signal consisting of a pulse and bar. When viewed on a monitor, the window signal produces a large white square in the center of the picture. 3. A graphical user interface that presents icons and tools for manipulating a software application. Most applications have multiple windows that serve different purposes.


The Microsoft Windows Operating system, which runs on DOS-based PCs.

Window Event

A triggered event that will accept an external trigger such as a GPI or manual switch only within a specified time period.

Window Shades

See also: Pillar box, side panels.

Windows CE

Microsoft Windows CE is a 32-bit real-time embedded operating system (RTOS) designed to empower the development of computing appliances, including set-top boxes, digital versatile disc (DVD) drives, entertainment consoles, smart phones, highly portable and personal computing devices like handheld computers, and home appliances. Windows CE is modular, allowing use of a minimum set of software components needed to support receiver requirements. This uses less memory and improves operating system performance. Windows CE provides a subset of the Win32 application program interface (API) set, which provides an effective amount of application source-code level portability and compatibility and user interface consistency with other Microsoft Windows operating systems and Windows applications.
see also:Java.

Windows Media Player

Delivers a popular streaming and local audio and video formats, including ASF, WAV, AVI, MPEG, Quick-Time, and more. Windows Media Player can play anything from low-bandwidth audio to full-screen video.

Windows NT

A good platform for state-of-the-art video editing and 3D graphics creation. It does not have any of the inherent limitations of Windows 3.1x.  Unlike Windows, there is no longer a 4-gigabyte file limit, there is an improved system for handling drivers and it is written in 32-bit code throughout; so everything works faster.  Since NT is a 32-bit system running on a 32-bit machine, there is a dramatic performance increase. There is also multiprocessor support for even faster rendering speed. Windows NT can run on Intel, Alpha, and MIPS platforms, giving a wide choice of system speed and price.  Its enhanced reliability protects against system crashes. NT is also Network and Internet ready, allowing one to easily distribute the finished video product.

Window Shades:

See: Side panels.


Windows Sockets. A technical specification that defines a standard interface between a Windows TCP/IP client application (such as an FTP client or a Gopher client) and the underlying TCP/IP protocol stack. The nomenclature is based on the Sockets applications programming interface model used in Berkeley UNIX for communications between programs.


An optical effect where the picture appears to have been “wiped” from the screen, i.e., left to right, or top to bottom.


Low-frequency audio speaker.


A number of digital bits that are handled as a group instead of individually.

World Wide Web

Created in 1989 at a research institute in Switzerland, the Web relies upon the hypertext transport protocol (http), an Internet standard that specifies how an application can locate and acquire resources stored on another computer on the Internet. Most Web documents are created using hypertext markup language (html), an easy to learn coding system for WWW documents.

Work Orders

Printed instructions sent to various departments in the plant, instructing them to process media in some way. The first three Work Orders are generated by schedulers or contract people. The following five are referred to as Media Movement Work Orders (MMWOs) and are generated through the On Air Schedule:

 Work Print

In a motion picture studio or processing laboratory, a rough print of a motion picture film used for editing and study of action and continuity.


A high-end computer system having many of the characteristics of a personal computer; intended for use by engineers or imaging professionals.

WORM  (Write-Once-Read-Many)

A one-time recordable videodisc or CD-ROM medium. Information can be recorded and erased, but not re-recorded. Write-once videodiscs are used for scientific, image database and interactive video development purposes where only a few copies are required or where the visual information requires frequent updates.

Writing Speed

How fast the information is written onto the tape. In video recording, writing speed impacts the amount of information that can be stored on the tape, and therefore, the quality or resolution of the recorded signal.

WYSIWYG  (What You See is What You Get)

Refers to computer systems that give you an on-screen image of the final printed or recorded product, rather than substituting symbols or codes.

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