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Today , 2007
December 22nd, 2007

Wireless Hidden Cameras

Wireless Hidden Cameras have the great advantage that they are portable. They do not have electric wires which compel them to be hooked down at a particular place. They work on batteries; usually two 9-volt batteries are sufficient for their operation. Wireless hidden cams pick up images from their field of vision using lasers and then transmit them to a remote TV or computer monitor. They are made compatible with the screen using appropriate programs.

Clever disguises are used to conceal Wireless Hidden Cameras, because the success of the camera depends on its being hidden. The design of the camera can be as masterful as the maker decides. They can be tucked in table lamps or wall clocks. Sometimes they are camouflaged within paintings and mantelpiece curios. They can also be crafted into cell phones, wristwatches, pencil sharpeners, cigarette packets, suits, jackets and even buttons. The wireless technology makes the camera so versatile that some of them can be attached to almost any object.

Obviously, to fit in all these things, wireless cams have to be very small. They have miniature lenses, which are only a couple of millimeters in diameter, no larger than a pinhole. They use integrated circuits to record their images. The circuit of the camera is integrated on a board, which makes it very thin and easy to fit within any frame.

Wireless camera technology is ideal for people on the move. They can operate at distances of a few hundred feet, but some high-end wireless cams can transmit images up to 40 miles. They are designed to record images at different angles. They may have more than one channel to display different fields of view. Wireless cameras can display their images using laser sensors, or even use an adapter cable to be directly connected to a VCR or CPU.

Hidden Cameras provides detailed information about hidden cameras, hidden security cameras, hidden video cameras, wireless hidden cameras and more. Hidden Cameras is the sister site of Security Cameras Web.

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December 22nd, 2007

USB Computer Connectivity Colossus

USB has become the Colossus of computer connectivity, standing astride the world of computing accessories and peripherals with the self-confident ease of a standard that has triumphed over its opponents. Parallel and serial protocols are virtual dinosaurs, being phased out almost universally by computer manufacturers. Firewire (IEEE 1394) still maintains a presence in certain nice markets, in large part due to the dogged determination on Apple Computers and Sony to keep pushing the standard. But what has caused USB to become the standard of choice for computer connectivity?

The first answer is speed. For years, computers used serial (RS-232) and parallel (IEEE 1284) for data connection and transmission between computers as well as devices. However, the transmission speed of these protocols are slow, averaging 4mbps with the most recent parallel revision and an average 58,000bps with serial connections. In contrast, USB 1.1 has a 12mbps transfer speed and USB 2.0 high speed can go as high as 480 mbps. The speed difference coupled with the durability, universality, and simplicity of the USB connection easily tolled the death knell for serial and parallel ports.

This still fails to explain the ascension of USB over Firewire. Though Firewire has a max transfer speed of 400 mbps (80 mbps slower than the USB 2.0 standard), when it comes to transferring large quantities of data Firewire actually has the advantage of USB. Apparently, USB’s transfer rate tops out at 480mbps but its average speed is quite a bit slower. Firewire, on the other hand, has a consistent 400mbps transfer rate, making it ideal to transfer large files or data streams such as audio and video. It is this constant high-speed connection that has made Firewire the connection of choice for multimedia applications.

Firewire’s downfall comes not in design quality but in price. Where USB is actually quite inexpensive for manufacturers to implement, Firewire costs $1-$2 per connection. Thus, fewer manufacturers have made devices that support Firewire, relegating the standard to the multimedia computing niche. In addition, a minor factor is the slightly less durable nature of the Firewire connector.

That said, there is a strong possibility that several years from now, USB will no longer be the standard of choice as its successor, Wireless USB, comes into the computer connectivity market. Boasting USB 2.0 speeds, similar ease of connectivity, and the complete absence of tangling wires, Wireless USB could easily become the de facto standard of the future.

Nathan Kartchner works in Product Development for Sewell Direct, an online distributor of USB adapters and other connectivity products. Look for Wireless USB products as they become available.

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