Ideas on Video Communications [Video]

Wireless Video over Wi-Fi - 2.4GHz and 5 GHz http://vidovation.com/

The 2.4 GHz Wi-Fi frequency band (ranging from 2.4 GHz to 2.47 GHz) is extremely crowded. Notice that only channels 1, 6 and 11 do not overlap when used at their full bandwidth of 20 MHz. The heavy traffic within this frequency band is due to the great popularity of wireless connections for all types of portable equipment including laptops, tablets, security cameras, and many other devices. Also, because this band is unlicensed, there are essentially no protections that prevent another user from turning on their device and causing harmful interference at any time in any location. These factors often combine to make the 2.4 GHz band of Wi-Fi less desirable for professional quality wireless video transmission.

The 5 GHz band is a significant improvement over the 2.4 GHz band, although it is subject to most of the same technical issues. Historically, most laptop and tablet devices have not included 5 GHz Wi-Fi radios, so in general, the level of interference is much lower than at 2.4 GHz. In addition, there are significantly more non-overlapping channel frequencies available (a total of 21) in two blocks from 5.15 to 5.35 GHz and 5.47 to 5.825 GHz These factors combine to make the 5 GHz band a much better choice for professional video applications that use unlicensed Wi-Fi connections.

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70 GHz Wireless Video Links

http://vidovation.com/Transport/Wirel...

New high speed semiconductor tech provides compact and low cost 70GHz wireless technology Lightly licensed, small annual usage fee Distance 2-5KM Video Applications: Uncompressed HD SDI Links, single and dual channel or duplex Supports embedded audio, metadata, timecode etc. Near zero latency Ideal for sports, live interviews etc.

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Wireless video HDMI & HD SDI, Transmitter & Receiver systems such as cellular bonding, unlicensed Wi-Fi, COFDM, 60GHz, microwave. etc, are discussed. http://vidovation.com/wireless-video-...

The Wireless Video Transmission Broadcast Guide covers:

Selection Criteria Supported Bit Rates Link Distance Video Interfaces Video Formats and Compression Initial and Recurring Costs License vs. Unlicensed Spectrum Portability Antenna Types Wireless Applications Sports News Gathering Grab-and-Go Anywhere Camera's Television and Film Production Confidence Monitoring Video Assist and On-set Monitoring Wireless Technologies Traditional Private Microwave Unlicensed Wi-Fi 4G LTE/Bonded Cellular 60 GHz Uncompressed HDMI & HD SDI

Summary:

New technologies have greatly expanded the number of choices available to broadcasters for transporting live video from venues to studios. For example, cell-phone circuit bonding has now made it possible to transmit live video from anywhere that has good cellular coverage. Recent advances in Wi-Fi standards have increased the bitrates available for transporting video in local areas. Today, even uncompressed HD video can now be transported wirelessly using 1.5 Gigabit radio links operating at 60 GHz. Each technology has benets and drawbacks, relative to specic applications and user environments.

Wireless video transport has been a key part of television broadcasting since the rst over-the-air transmission tests were performed almost a century ago. The methods used to transport video signals from one location to another have continued to push the limits of each new technology that has come along, including coaxial cable, microwave, satellite, ber optics and cellular radios. With high bandwidth signals, demanding QoS (Quality of Service) requirements and sensitivity to excessive delay, video has often been at the leading (or bleeding) edge of the capabilities of many technologies.

Building on these past successes, television broadcasters today have an enormous range of wireless video transport options. These range from dedicated links that support 1.5 Gbps uncompressed HD video to highly compressed video streams that run over Wi-Fi infrastructure. In between are devices and systems to t virtually every application. With so many choices, it can be dicult to select a suitable product that oers the best combination of performance and reliability at a price point that makes sense for each project.

Modern modulation technologies can pack more bits into a given amount of channel bandwidth. Changing from a modulation technique that uses two bits per symbol (such as QPSK) to one that uses four bits per symbol (such as 16QAM) will double the bit rate on a wireless link without changing the channel bandwidth. There is, of course, a cost in doing this, with more processing power needed on both ends of the connection to generate and detect these more complex signals. Plus, there is another penalty associated with the more complex modulation schemes: they are more sensitive to noise and interference. This is why Wi-Fi signals, among others, will automatically adjust their modulation (and consequently bit rate) between more simple and more complex schemes to adapt to changing RF channel conditions.

Exerpt from 60GHz Section: New high-speed semiconductor technology has enabled the development of aordable, compact wireless systems that can operate in the unlicensed 60 GHz frequency range. 60 GHz systems on the market today oer completely uncompressed HD-SDI operation at 1.5 Gbps, including any embedded audio channels, metadata, SMPTE time code, etc. Because the signals are uncompressed, no encoding/decoding delay is present in the system, making it ideal for sports, live interviews and other time-sensitive applications. Solutions are also available in the 70/80 GHz and the 90 GHz frequency bands, including high speed Ethernet links that can support bi-direction GigE speeds, which is great for high performance IP video and audio networking. Signals operating at these very high frequencies.

Example Specifications:

Fixed Portable Unlicensed Bonded 60 GHz COFDM Microwave Microwave Wi-Fi Cellular HDMI HD SDI Transmitters Recievers Uncompressed Bit Rates 20-50 Mbps 5-50 Mbps 5-200 Mbps 1-20 Mbps 1.5 Gbps Link Distance 1-50 km 1-10 km 0.1-5 km N/A 300-500m Video Interfaces ASI, SDI, HD-SDI ASI, SDI, HD-SDI SDI, HD-SDI, IP SDI, HD-SDI HD-SDI Video Compression Antenna Types Parabolic Parabolic Omni or Dish Omni (typical) Parabolic

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AB512 7 msec Delay, Broadcast Quality, Wireless Video Link with 3 KM / 2 Miles range. Learn how the system works in this recorded webinar. https://www.vidovation.com/product/7-msec...

Wireless video systems used to have quite a bit of latency, as much as 2-6 frames, causing all sorts of audio lip sync and video delay issues. But now, the newest wireless video systems have just 7 milli-seconds latency (much less than a frame!) and use industry standard H.264 encoding – which means lip sync issues are solved and switching between various cameras and sources is seamless.

We've had a lot of questions about this new technology from "Just 7 milli-seconds, is that for real?!" to "How can I solve the lip sync issues we are dealing with at live events?" See how it works, ask your questions live, get a feel for the latest wireless camera systems and how they could help you. Learn about:

* New low latency, long-range wireless camera technology for broadcast.

* Why super low latency (7ms delay) is needed in a wireless system.

* How to connect different venues together (e.g. stadium, tunnel, locker room, tailgaters)

* Find out why you need dynamic frequency hopping.

* Why 40 Mbps throughput is needed for superior video quality.

Watch the recorded webinar to learn more about live wireless broadcast, how the new low latency systems really work, adaptive modulation, adaptive bitrate, and more.

ABonAir’s AB512™ systems deliver video in an unexpected 7 msec delay without compromising ABonAir’s reputation for superior video quality. In addition to the 7mSec delay, the AB500™ product family includes a proven H.264 CODEC that was explicitly designed to reduce latency and increase picture quality in wireless video systems. The range increased to a fantastic 3 KM or 2 Miles by CODEC-Wireless optimization. The system features an automatic RF spectrum analyzer which automatically selects and hop to the best RF channel without dropping a single bit. The manual channel selection option is ideal for frequency coordination. Based on RF link conditions the system features Adaptive Modulation and Adaptive Bitrate.

AB512 – ABonAir Best Wireless Video Link.

The most comprehensive, feature-rich solution with all upgrade option. ABonAir’s AB512™ wireless video system enables camera teams to transmit video directly from cameras to media centers or OB trucks wirelessly. Built on a bi-directional radio channel between transmitter and receiver, ABonAir’s systems acknowledge the correct acceptance of each group of pixels, thus provides exceptionally robust and reliable transmission. The AB512™ supports ABonAir’s Fiber Coverage Extension (FCE), which enables connection of a single receiver to multiple FCEs in various venue locations (e.g. Horse Race Track – racetrack, stables and the winning circle) or even on completely separate sites (e.g. football stadium, basketball arena and swimming pool) all via fiber cables with unlimited range.

AB512-Receiver-ABonAir 7 msec Delay (subframe delay)

For live event coverage & multi-camera production Low delay enables the production of multi-camera and live show without worrying about the delay caused by the simultaneous operation of different cameras or lip sync.

Delay_7_msec_AB512 1U or Portable Receiver for maximum flexibility.

For fixed setups or a temporary production.

Until a few years ago, only large networks could use wireless equipment because it required purchasing expensive frequency licenses from the regulator. In recent years, however, governments and regulators around the world provide unlicensed frequencies for public use for any purpose – including video transmission – allowing even smaller productions to use wireless links easily and free of charge. To answer this demand, manufacturers started to develop unlicensed solutions. Unlicensed systems’ volume grew and drove cost down, motivating big networks also to use them even though they own frequencies.

AB512-Receiver-1RU-Portable-ABonAir High-picture quality (+52db PSNR) with new revolutionary CODEC technology New ground-breaking CODEC by ABonAir enables an accurate frame encoding at high speeds and excellent picture quality.

During this session attendees will explore the ways to implement, install, and support a 60GHZ wireless video camera system that can deliver a clear, uncompressed HD signal up to 500 meters.

Use video networking and IPTV to improve corporate communications. Compatible with IPTV Live TV and Video Distribution on the NetworkTV, Display, PC, Smartphone, & Tablet Clients. Allows for live corporate broadcasting, enhanced training and better information dissemination to employees.

Are you interested in Video Networking & IPTV? Want to learn more from VidOvation, one of the leading vendors in this space? Do you want to learn how to prevent costly mistakes in designing and implementing an IPTV system? Curious how VidOvation can design you a broadcast quality video-over-IP system at 1/3rd the cost of competing systems?

Download and listen to part 2 of Choosing the Right Wireless Video Technology a recording of a recent video podcast on choosing the right technology for your wireless video system.

Download and listen to part 1 of a recording of a recent video podcast on choosing the right technology for your wireless video system.