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Wireless Video Camera Technology Explained
Video systems have become a part of our everyday lives. When video surveillance systems first hit the industry in the mid 80's, they immediately designed a major impact on crime prevention and exactly how crimes are investigated. Early video systems required a hardwired connection involving the camera and the recording system. Recent innovations in wireless video transmission are changing that requirement.
Wireless video systems are appearing all over the place to satisfy a selection of consumer requirements. From wireless baby monitors to high-end high-definition wireless broadcast systems, wireless video systems can be found in a wide range of prices, features.
Most modern, consumer grade wireless video systems will fall into one of the following frequencies; 900 MHz, 2.4 GHZ or 5.8 GHz. Many of the affordable consumer grade wireless cameras in the marketplace fall into the 2.4 GHz range.
Every wireless video system is made up of camera, a transmitter, a receiver, an antenna along with a power supply. Transmission ranges can differ greatly depending on the frequency, the antenna and the rated power output.
With the exception of higher end, high power broadcast quality systems; most wireless video systems don't require a license in the Federal Communication Commission (FCC) to use. No matter what frequency you want on using, if you're installing a high powered installation, especially near a highway or perhaps an airport, you should secure the right FCC license.
For the best results and the longest range, most wireless video transmission systems demand a clear line of site involving the transmitter and the receiver to use consistently. Wireless video signals usually do not penetrate very well through glass, walls, concrete, trees, steel or any other obstructions.
In addition, other RF signals across the same frequency can cause interference or be interfered with by wireless video systems. Within the 2.4 GHz range popular with most security applications, interference could be experienced between cordless phones, microwave ovens, local television broadcasts, computer monitors, power supplies or wireless LAN/WANs. Sometimes interference problems could be solved by re-locating the transmitters or receivers.
Since 90% of consumer grade wireless video systems fall into the 2.4 GHz category, we are going to discuss the features of both the 2.4 GHz analog and digital systems and the limitations and great things about each.
The entire 2.4 GHZ bandwidth allocated for consumer me is from 2,412 MHz to 2,462 MHz. As per the FCC standards, there are 11 possible channels that are 22 MHz wide using a 5 MHz spacing interval in between each.
In order to allow multiple cameras for a passing fancy system, residential, consumer grade 2.4 GHz analog video transmitters for instance a wireless baby monitor or a front door camera require fixed frequency, non-overlapping channels to reduce interference.
These 2.4 GHz analog wireless cameras are some of the most popular video surveillance systems for consumers and clients, yet very few professional security providers will offer you these wireless cameras.
At best, professional security installers look at the 2.4 GHz analog video systems as low-end residential solutions that are notoriously unreliable. The analog 2.4 GHz cameras can be identified by their cost which is usually inside the $ 69.00 to $ 140.00 range per camera.
If you take away the benefit of their inexpensive, there are several inherent limitations to Analog 2.4 GHz video transmission including:
Within the 2.4 GHz range, there are only 4 available non-overlapping channels. This limits these systems to a total of 4-cameras, as both versions is tuned to a different pre-defined frequency. Each of these fixed frequencies is capable of doing transmitting about 11 mega-bits per second of data (Mbps).
Because the analog 2.4 GHz wireless video transmitters take presctiption fixed frequencies, they may be especially susceptible to interference from outside sources. A typical transmission range to have an analog 2.4 GHz wireless video link is all about 200 to 300 feet when installed outdoors using a clear line of site. The relative transmission distance is greatly reduced when installed indoors with a few lower end analog systems typically providing about 10-30 feet.
As these cameras are transmitted over a fixed, un-secured open frequency, the signal is definitely intercepted and can be seen by you aren't a 2.4 GHz 4-channel receiver. A voyeur or a burglar could simply drive around a neighborhood using a receiver and see in your home. If you have one of these systems installed, what about a burglar is watching you at this time.
In 1997, the Institute of Electrical and Electronics Engineers (IEEE) came up with first Wireless Neighborhood Network (WLAN) standard which was named 802.11. The original 802.11 utilized the two.4 GHz frequency allowing reliable transmission of 2-Mbps of bandwidth. In 1999, the typical was upgraded to 802.11b which assists up to 11 Mega-Bits per Second (Mbps) which was comparable to traditional Ethernet connectivity speeds.
The 802.11 protocol functions by sub-dividing the entire 2.4 GHz frequency into channels and switching together during transmissions. Because the signal is sent, it sends a packet of data at one frequency after which hops to the next channel and sends another packet and so forth, until the entire data package is shipped.
In 2003, WLAN products began supporting a brand new 2.4 GHz wireless standard called 802.11g which assists a bandwidth of 108 Mbps of data. The days of affordable, reliable and secure wireless video transmission have finally arrived.
The added benefits and features of using internet protocol cameras and 802.11g for wireless video transmission in a security application are numerous.
The 802.11g protocol utilizes digital bi-directional signals which offer the use of pan/tilt/zoom functions and presets seen in many newer cameras. The digital signal used is duplex (bi-directional) as opposed to the simplex (one-way) binary signal used in analog type systems.
Because 802.11g utilizes the entire 2.4 GHz frequency spectrum, interference is greatly reduced and longer transmission ranges to expect. If an area of the frequency is noisy then your transmitter/receivers will adapt the signal by sending smaller packets inside the noisy affected area and larger packets inside the non-effected areas of the frequency. An invisible IP video system will offer you almost the same performance as a professional grade wired system using a reliable transmission array of 150-200 feet.
If the camera is to be located further than 200 feet, directional antennas are available which can increase the distance to 600 or even more feet. If a greater distance than 600 feet is required, point to point, long range directional type systems can increase the distance to several miles.
Along with standard 64/128-bit WEP Security, 802.11g protocol allows data packets to be encrypted using a 40-bit RCA key. When considered in conjunction with the inherent security constructed into DSSS spread spectrum technology, the info signals are at least as secure as data traveling more than a wired network.
The 802.11g protocol can hold a much larger number of wireless cameras simply by using a medium access control or MAC layer called CSMA/CA or Carrier Sense Multiple Access/Collision Avoidance. The collision avoidance in 802.11g props up use of CTS/RTS signals (clear to send/ready to transmit) which tell each camera around the system when it is O.K. to begin with transmitting or receiving data thereby avoiding interference.
Any hardwired IP Camera that's installed on your intranet or internet that's using the same CODEC (Coding & Decoding) algorithm could be integrated into the same software viewing and recording system.
An IP addressable camera system can be viewed or recorded from a properly equipped computer from the location in the world. This could allow you the freedom to move anywhere on the planet while still checking your assets. In addition, if you ever decide to move your mind end recording equipment to a different location, you simply pick it up and move it. No wires to re-route.
Think about remember when deploying a multi-camera wireless IP based video method is that processing multiple streaming video signals places a substantial work load on a computers CPU.
Hard Wired systems have Video Capture cards that are installed in the PC/DVR. Prepaid cards take up to half of the job load off the computers CPU. Because wireless IP video systems do not have the help of these capture boards, the computers CPU must handle 100% of the processing workload.
This implies that as you add cameras to a wireless system the whole frame rate or the total images per second which may be viewed and recorded will decline because of the increased workload.
Many people shy away from IP and network security solutions simply because they appear to be complicated and hard to set up. The fact is the initial set up does require some expertise and knowledge but the operation and day to day use of the systems aren't any different than using any other PC based security camera system. The required computer skills are minimal. If a person can check email, work with a word processing program or load and play any type of game on a PC they probably possess the skills required to use and manage a PC based system.
Just thought you may well be interested in reading this guide: wireless video camera and wireless web camera.
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Articles on Video Art, Including: Participatory Cinema, Concrete TV, Video Painting, London Video Arts, Video Synthesizer, Visual Music, Vjing, Experimental Television Center, Lab HD, Shaun Wilson, Magmart, Perpetual Art Machine $12.96 Used - Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hephaestus Books represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Hephaestus Books continues to increase in scope and dimension, more licensed and public domai |
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Articles on Video Art, Including: Participatory Cinema, Concrete TV, Video Painting, London Video Arts, Video Synthesizer, Visual Music, Vjing, Experimental Television Center, Lab HD, Shaun Wilson, Magmart, Perpetual Art Machine $17.34 Used - Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hephaestus Books represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Hephaestus Books continues to increase in scope and dimension, more licensed and public domai |
