The Main Wireless HDMI Transmission Protocols and Their Typical Products
Wireless HDMI Transmission are Needed
Thanks for the fast evolvement of wireless tech, we are now experiencing higher speed wireless network than before. People always want wireless because we naturally don’t like mass wires. Wireless is currently an inevitable trend and lifestyle for everything. Wireless HDMI transmission entered the world as a vivid explanation of this phenomena: WE WANT ALL THINGS WIRELESS!! Now Wireless HDMI transmission is available and affordable. It can be performed through several different protocols including WHDI(Wireless Home Digital Interface), WirelessHD, WiGig(Wireless Gigabit Alliance),WiDi(Wireless Display), Airplay, Miracast and others.
These wireless protocols share something in common but also have their own distinct characteristics. Some of them have already won big percentage of wireless HDMI consumer market, while some others are still theoretically practical but without actual products.
So there are diverse kinds of wireless HDMI extended kits with diverse protocols. It is not so easy to tell the difference between them. We will make some simple description of each wireless HD transmission standard to help you form a clear image when getting yourself a wireless HDMI kit.
WHDI the Most Practical and Popular Wireless HDMI Protocol
WHDI has changed our previous impression of wireless video: lose of quality, long latency, distortion of image. It provides us uncompressed HD signal up to 1080p resolution in the 5Ghz unlicensed band, with support for 3D TV and 5.1 surrounding sound as well.
What WHDI gives customers is the convenience and the flexibility. 5GHz spectrum regulations are naturally superior for wireless transmission. The range under this WHDI wireless protocol is beyond 100 feet. Signal can easily penetrate brick walls. You can easily setup a whole wireless entertainment system without any worrying about the location of devices, whether it is for the source or the playback .
Any Wireless HDMI device with this protocol comes with near zero and neglectable latency, namely less than 1ms. WHDI also features feedback controls channel, so you can control the source device through its own remote or gaming paddle. These make it a perfect partner for a gaming console and any circumstance requiring harmony of separate screens. You can easily connect any video sources through a WHDI Wireless HDMI transmitting kit with HD displayers wirelessly. These devices include: PC, Notebooks, Smart Phones, Satellite boxes, Xbox and Blu-ray players.
In short terms, WHDI equals uncompressed 1080p+ low latency+ multi-room availability + low power consumption. It surpasses competitive technologies by providing outstanding and consistent picture quality equivalent to wired HDMI cable.
WHDI Wireless HDMI devices
As the most successful wireless HD protocol. Many companies choose WHDI for their products. These product includes
Nyrius ARIES Pro digital wireless HDMI transmitter
The Nyrius ARIES Pro digital wireless HDMI transmitter is designed to meet the increasing demanding of high quality video transmission on the market. This Nyrius wireless HDMI transmitter and receiver system integrates WHDI technology, given by an Israeli Hi-tech company AMIMON, for truly HD wireless video broadcast. With whom you… Read Review
IOGEAR GW3DHDKIT Wireless 3D Digital Kit
This IOGEAR GW3DHDKIT Wireless 3D Digital Kit we will talk about today is one of the best wireless HDMI transmitter&receiver kits. It will give you the uncompressed wireless full-rate HD audio and video up to 100 feet between the transmitter and the receiver, which can be mounted on or behind your wall mounted HDTV… Read Review
Atlona LinkCast Wireless HD Audio/Video Station
Atlona LinkCast Wireless HD system Atlona LinkCast Wireless HDMI Audio/Video System is a highly rewarded wireless transmission solution, which had won the Electronic House 2012 “Product of the Year” award and 2012 CES Innovations Award. This LinkCast Wireless HD system is intended to provide convenient and affordable method… Read Review
WirelessHD: Powerful And Promising Wireless HD Protocol
The WirelessHD specification is based on a 7 GHz channel in the 60 GHz Extremely High Frequency radio band. Unlike other wireless HD signal broadcast protocol WirelessHD choose a high frequency radio realm 60 GHZ to fulfill its mission.
All characteristics of this specific wireless communication consortium are determined by this unusual decision. This fundamental difference of 60 GHz systems has some technical advantages compared to other network protocols like Wi-Fi, but also has some inherent limitations.
Pros of WirelessHD
WirelessHD protocol utilizes this very high frequency to increase the amount of network bandwidth and effective data rates they can support. It can provide uncompressed digital transmission of HD video and audio and data signals, essentially making it equivalent of a wireless HDMI. The 1.0 version of this standard supported data rates of 4 Gbps, while new version 1.1 increases the maximum data rate up to 28 Gbit/s. This is the highest theoretical data rate of all wireless HD transmission nowadays. So WirelessHD supports 1080p, 3D formats and 4K resolution without any problem.
Another superior point of WirelessHD is the compatibility of high rates wireless audio formats The DVDO Air Based WirelessHD protocol is the only available wireless HDMI product can transmit 1080p video and 7.1-channel audio simultaneously, While WHDI product like Nyrius Pro are now capable of 5.1 channel, without using an HDMI cable.
Like WHDI it also features remote controlling which enables users to control the WirelessHD devices and choose between sources for the display. The WirelessHD specification supports DTCP(Digital Transmission Content Protection) for encrypted content with copyright.
Cons of WirelessHD
High frequencies equal short waves. These waves are might likely to reflect on any smooth surfaces. Signals under this protocol are not able to pass through most physical obstructions. Although WirelessHD try to enlarge the beaming range by increasing the signal’s effective radiated power and utilizing wall reflections. This typical 60 Gbps HDMI wireless protocol vivid connection is still within the distances of 30 feet.
DVDO WirelessHD System
This wireless DVDO AIR system works to transfer full, uncompressed HD signal to any HD display device, so you can watch 1080p movies and enjoy full 7.1 channel surround sound wirelessly. Unlike other wireless HDMI streaming devices DVDO Air wireless HD connection system works under The Wireless HD (also called WiHD) standard, which runs on 60 GHZ realm instead of the normally crowded 5 GHZ… Read Review
WiGig or 802.11ad: Compatible Wireless Wi-Fi Transmission Protocol
WiGig is the trademark for Wireless Gigabit Alliance, an alliance formed to develop and promote the wireless Wi-Fi transmission protocol 802.11ad. Like WirelessHD, this protocol is operating over the unlicensed 60 GHZ frequency band. The WiGig specification allows devices to communicate without wires at multi-gigabit speeds. Theoretically a typical WiGig device can deliver data transfer rates up to 7 Gbit/s with whole 7 GHZ bandwidth.It is approximately as fast as an 8 antenna 802.11ac transmissions. If divided to four 2.16-GHz wide channels, one single-channel can archive a speed up to 4.6 Gbit/s.
WiGig Alliance has merged with the Wi-Fi Alliance and its wireless HDMI standard is defined in the IEEE 802.11ad. This means WiGig get a full compatibility with existing Wi-Fi IEEE protocols. Most consumers are well aware of IEEE protocols because they have experience with all the earlier ones, namely IEEE 802.11a, b, g, and n. The 11b/g/n standards operate in the 2.4-GHz band. The 11a/ac/n standards operate in the 5-GHz band, and the 802.11ad standard targets the 60-GHz band. The WiGig tri-band Wi-Fi chips can switch seamlessly from one standard to another in one of the three Wi-Fi bands: 2.4, 5, or 60 GHz.
Maybe WirelessHD has a step in advance for giving of tangible products. But WiGig will not lose this battle lightly. The 60 GHz signal cannot typically penetrate walls connections through walls. WiGig high rates wireless HDMI connections are also restricted to a single room. Nonetheless, unlike WirelessHD when roaming away from the main room WiGig can switch to make use of the other lower bands,2.4 or 5 GHZ, at a much lower rate, but which propagate through walls. WiGig and WirelessHD are widely perceived as competing technologies. Some believe WiGig may even replace Wi-Fi technology someday, although this would require solving its range limitation issues. There are no practical WiGig product except Dell has made some trying.
Other potential Wireless HDMI transmission methods
Miracast is a Wi-Fi direct peer-to-peer connection without interaction of wireless router. In this respect, it functions like a Bluetooth connection. Miracast supports 1080p HD video and 5.1 surround sound as well. It allows users to mirror the display from a phone or tablet onto a TV, share a laptop screen with the conference room projector simultaneously.The most common used product are Google Chromecast.
Intel has developed its own wireless transmission protocol: Wireless Display(WiDi). Like all the standards referred to above, WiDi also supports HD 1080p resolution and 5.1 channeled audio. Low latency and interacting app are featured with this wireless transmission technology. It is more for source devices like tablets and smart phones. Laptops/ Ultrabooks with WiDi 3.5 and higher are Miracast-compatible. There are plenty of Wireless Display Dongles and Laptops supporting WiDi transmission.
AirPlay is the most famous licensed proprietary protocol by Apple. Originally it is just for Apple’s own software and devices to stream audio, video, and photos. In order to be competitive with others, Apple has licensed AirPlay to third-party company. Many products are now compatible for AirPlay,but the most successful AirPlay device is no doubt the Apple TV by Apple inc. itself.
We often need reliable wireless video connection to pass through walls or rooms in some places where drilling holes or wire relocation is inconvenient or even impossible. So wireless is perfect for a rented home, houses owned by cautious owners or designers who want to relocate their display device. Wireless HDMID broadcasting reduces installation time and removes the need for complex cable arrangement. These bring us a more flexible solution to deliver the best wireless HDMI image. Wireless has been prevented to be time and money saving.WHDI is the most successful and practical protocol for wireless HDMI presently. Although there are various wireless HDMI protocols WHDI technology is the only technology that promises the delivery of 4K*2K resolution by next year. Using the 5Ghz unlicensed band, it surpasses competitive technologies by providing outstanding and consistent picture quality equivalent to wired high quality HDMI™ Cable, low latency (less than 1ms), multi-room availability and low power consumption. WHDI turns out to be more reliable and flexible than 60Ghz technologies such as WiGig and WirelessHD because of their inability to pass through barriers and walls. WiDi, AirPlay and Miracast need supporting from certain products or software to perform wireless HD transmission. In the following table, you can see other tech details of each wireless HD transmission consortium.
|Transfer Rate||3GB (of raw video)||5GB||7GB||not given||not given||300MB|
|Range||100 feet||30 feet require line-of-sight||not given||The exact composition of the protocols that AirPlay Mirroring uses have not yet fully been discovered, or reverse-engineered||230 feet(Theoretical the same as WiFi)||20 feet range|
|Line of Sight||Not Need||Need||Need||Not Need||Not Need||Not Need|
|Frequency||5 GHz||60 GHz||60 GHz||2.4 & 5 GHz||2.4 & 5 )||60 GHz|
|Video support||1080P||1080P||1080P||1080P||1080p||WiDi 1.0 720P WiDi 2.0 1080P|
|Audio support||5.1 channel||7.1 channel||5.1 channel||Two audio channels||5.1 channel||5.1 channel|
|Devices||home audio/video components||home audio/video components||portable computers desktop computers||All iOS devices such as iphone, iPod,iPad and other third party products||Miracast is now integrated into Android 4.2,so many mobile devices are capable of it||portable computers desktop computers HDTV,Projector|
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