Category Archives: W

WAV (.WAV)

An audio file format developed by Microsoft that carries audio that can be coded in many different formats. Metadata in WAV files describes the coding used. To play a WAV file requires the appropriate decoder to be supported by the playing device.

Website: www.microsoft.com

Wavelet

A compression technique in which the image signal is broken down into a series of frequency bands. This is a very efficient but the processing is more complex than for DCT-based compression that uses Fourier transforms. Although some wavelet-based compression was used by some manufacturers now all wavelet compression used in the media industry is JPEG 2000. It is prevalent in DCI digital cinema, is used in some new camcorders and is increasingly used in contribution and distribution circuits.

See also: JPEG 2000

Widescreen

A TV picture that has an aspect ratio wider than 4:3 – usually 16:9 – while still using the normal 525/60 or 625/50 or SD video. 16: 9 is also the aspect ratio used for HDTV. There is an intermediate scheme using 14:9 which is found to be more acceptable for those still using 4:3 displays. Widescreen is used on some analog transmissions as well as many digital transmissions. The mixture of 4:3 and 16:9 programming and screens has greatly complicated the issue of safe areas.

WiMAX

Worldwide Interoperability for Microwave Access (IEEE 802-16 and ETSI HiperMAN) uses OFDMA modulation over its radio links. The WiMAX Forum describes it as “a standards-based technology enabling the delivery of last-mile wireless broadband access as an alternative to cable and DSL”. Unlike Wi-Fi, this offers symmetrical bandwidth (equal upload and download speeds) over longer ranges of some kilometers with strong encryption (3DES or AES). It connects between network endpoints without line-of-sight of the base station for fixed, portable and mobile wireless broadband. A typical cell radius is 3-10 km, offering up to 40 Mb/s per channel for fixed and portable access, and up to 1 Gb/s for fixed only.

Mobile networks are expected to provide up to 15 Mb/s capacity within a 3 km cell radius. WiMAX technology is incorporated in some mobile devices, allowing urban areas and cities to become MetroZones for portable outdoor broadband wireless access.

See also: OFDMA

Website: www.wimaxforum.org

Windows Media Player

The latest Windows Media Player 12 (WM12) has been supplied with Windows 7 and 8 and includes a range of video and audio codecs including Microsoft’s own designs. File types handling include a wide range of MPEG4, and WMV video decoders to work with most popular formats.

WirelessHD (WiHD)

A formal special interest group comprising consumer electronics and other technology companies (LG Electronics, Matsushita (Panasonic), NEC, Samsung, SiBEAM, Sony and Toshiba), formed to promote and enable the rapid adoption, standardization and multi-vendor interoperability of WirelessHD technology worldwide. Products provide a wireless digital connection of up to 10 Gb/s at ten meters, combining uncompressed high-definition video, multi-channel audio, intelligent format and control data, and Hollywood-approved content protection. It means the elimination of audio and video cables and short distance limitations. First-generation implementation high-speed rates range from 2-5 Gb/s for CE, PC, and portable devices, with up to 20 Gb/s eventually possible.

See: VC-1

Word clock

Clock information associated with AES/EBU digital audio channels. Synchronous audio sampled at 48 kHz is most commonly used in TV. The clock is needed to synchronize the audio data so it can be read.

See also: AES/EBU audio

WORM

Write Once/Read Many – describes storage devices on which data, once written, cannot be erased or re-written. This applies to some optical disks that are removable, making them useful for archiving. CD-R and DVD-R are examples.

See also: Optical disks

WYSIWYG

What You See Is What You Get. Usually, but not always, referring to the accuracy of a screen display in showing how the final result will look. For example, a word processor screen showing the final layout and typeface that will appear from the printer. Or in an edit suite; does the monitor show exactly what will be placed on the master recording? This subject requires more attention as edited masters are now commonly output to a wide variety of ‘deliverables’ such as SD, HD, and UHD video, DVD, cinemas, the internet and social media… Issues such as color, gamma and display aspect ratio may need consideration.

See also: Color Management