WirelessHD, also known as UltraGig, is a proprietary standard owned by
Silicon Image (originally
SiBeam) for
wireless transmission of
high-definition video
High-definition video (HD video) is video of higher resolution and quality than standard-definition. While there is no standardized meaning for ''high-definition'', generally any video image with considerably more than 480 vertical scan lines (No ...
content for
consumer electronics products. The consortium currently has over 40 adopters; key members behind the specification include
Broadcom,
Intel,
LG,
Panasonic,
NEC,
Samsung,
SiBEAM,
Sony,
Philips and
Toshiba. The founders intend the technology to be used for Consumer Electronic devices, PCs, and portable devices.
The specification was finalized in January 2008.
Technology
The WirelessHD specification is based on a 7 GHz channel in the 60 GHz
Extremely High Frequency radio band. It allows either lightly
compressed (proprietary wireless link-aware codec) or uncompressed digital transmission of high-definition video and audio and data signals, essentially making it equivalent of a wireless
HDMI. First-generation implementation achieves data rates from 4 Gbit/s, but the core technology allows theoretical data rates as high as 25 Gbit/s (compared to 10.2 Gbit/s for HDMI 1.3 and 21.6 Gbit/s for
DisplayPort 1.2), permitting WirelessHD to scale to higher resolutions, color depth, and range. The 1.1 version of the specification increases the maximum data rate to 28 Gbit/s, supports common 3D formats, 4K resolution,
WPAN data, low-power mode for portable devices, and HDCP 2.0 content protection.
The 60 GHz band usually requires line of sight between
transmitter and
receiver, and the WirelessHD specification ameliorates this limitation through the use of
beam forming at the receiver and transmitter antennas to increase the signal's
effective radiated power, find the best path, and utilise wall reflections. The goal range for the first products will be in-room,
point-to-point, non
line-of-sight (NLOS) at up to 10 meters. The atmospheric
absorption
Absorption may refer to:
Chemistry and biology
* Absorption (biology), digestion
**Absorption (small intestine)
*Absorption (chemistry), diffusion of particles of gas or liquid into liquid or solid materials
*Absorption (skin), a route by which ...
of 60 GHz energy by oxygen molecules limits undesired propagation over long distances and helps control intersystem interference and long distance reception, which is a concern to video copyright owners.
[ ]
The WirelessHD specification has provisions for content encryption via
Digital Transmission Content Protection (DTCP) as well as provisions for network management. A standard remote control allows users to control the WirelessHD devices and choose which device will act as the source for the display.
Competition
WirelessHD competes with
WiGig in some applications. WiGig transmits in the same 60 GHz band used by WirelessHD.
See also
*
Extremely high frequency
*
IEEE 802.15 IEEE 802.15 is a working group of the Institute of Electrical and Electronics Engineers (IEEE) IEEE 802 standards committee which specifies wireless personal area network (WPAN) standards. There are 10 major areas of development, not all of which ar ...
*
UWB
*
Wireless HDMI:
**
Intel Wireless Display (WiDi) version 3.5 to 6.0 supports
Miracast; discontinued
**
Miracast
**
WiGig
**
Wireless Home Digital Interface
Wireless Home Digital Interface (WHDI) is a consumer electronic specification for a wireless HDTV connectivity throughout the home.
WHDI enables delivery of uncompressed high-definition digital video over a wireless radio channel connecting any ...
*
Wi-Fi Direct
ip based:
*
Chromecast
Chromecast is a line of digital media players developed by Google. The devices, designed as small dongles, can play Internet-streamed audio-visual content on a high-definition television or home audio system. The user can control playback with ...
(proprietary media broadcast over ip:
Google Cast for audio or audiovisual playback)
*
AirPlay (proprietary ip based)
*
Digital Living Network Alliance
Digital Living Network Alliance (DLNA; originally named Digital Home Working Group, DHWG) was founded by a group of PC and consumer electronics companies in June 2003 (with Intel in the lead role) to develop and promote a set of interoperability ...
(DLNA) (ip based)
port / cable standards for mobile equipment:
*
Mobile High-Definition Link - MHL
* SlimPort (
Mobility DisplayPort), also known as MyDP
References
External links
*
Civil mm-wave Regulation in USThe Main Wireless HDMI Transmission Protocols and Their Typical Products
{{DEFAULTSORT:Wirelesshd
Networking standards
Telecommunications-related introductions in 2008
Wireless display technologies