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Unit 2 (Input Devices (Keyboards (Numeric (10-key, number pad, numeric…

- - - - 10-key, number pad, numeric keyboard, numpad, or ten key, the numeric keypad is a 17-key keypad usually found on the far right side of a standard PC keyboard. A numeric keypad may also be a separate device that can connect to a computer.
    - - Have you ever played a chord on a piano or guitar? It’s basically the same principle used in chorded keyboards. It allows users to enter characters into a system with a limited number of keys. All you have to do is enter a combination to produce the desired character. These keyboards can simply be used with one hand only.
    - - A dedicated gaming keyboard is much like a standard keyboard except they have a few additional features such as multimedia keys, LED screen and palm rest. Illuminated keys are a key component of these keyboards.
    - - The specific technology used in such keyboards varies from device to device. In some chiclet keyboards, buttons are attached to the membrane with low-travel scissor switches, while in others, the keys are integrated into the base membrane which deforms only after completing an electric contact.
    - - Ergonomic keyboards are designed keeping human health factors in mind, such as muscle strain, back pain and wrist related injuries, which one may procure after spending hours on desktops. A typical ergonomic keyboard has a V-shaped design that allows both hands to stay at a more natural position while typing. Ergonomic keyboards have multiple subtypes including split and handheld keyboards.
    - - The rise of iPad devices and the smart touch technology gave birth to another type of keyboard known as a virtual keyboard. It is simply a virtual interface that allows users to input symbols and characters without hard, physical buttons.
    - - Membrane keyboards are a unique computer keyboard that uses pressure pads instead of individual/separate keys. Unlike traditional ones, membrane keyboards have symbols and characters printed on a flexible, flat surface also called membrane. When a marked area is pressed, an electric signal passes through the membrane to the underlying circuit board.
- - - - Surround sound is a term used to describe a type of audio output in which the sound appears to "surround the listener" by 360 degrees. Surround sound systems use three or more channels and speakers in front and behind the listener to create a surrounding envelope of sound and directional audio sources. The term surround sound has become popular in recent years and more commonly used since the advent of home theater systems. Surround sound can be either an analog or digitalsystem.
  - - - Short for thin film transistor, a type of LCD flat-panel display screen, in which each pixel is controlled by from one to four transistors. The TFT technology provides the best resolution of all the flat-panel techniques, but it is also the most expensive. TFT screens are sometimes called active-matrix LCDs.
    - - A type of thin display screen, called a flat-panel display, used in some older portable computers. A gas-plasma display works by sandwiching neon gas between two plates. Each plate is coated with a conductive print. The print on one plate contains vertical conductive lines and the other plate has horizontal lines. Together, the two plates form a grid. When electric current is passed through a horizontal and vertical line, the gas at the intersection glows, creating a point of light, or pixel. You can think of a gas-plasma display as a collection of very small neon bulbs. Images on gas-plasma displays generally appear as orange objects on top of a black background.
    - - A flat panel display is a television, monitor or other display appliance that uses a thin panel design instead of a traditional cathode ray tube (CRT) design. These screens are much lighter and thinner, and can be much more portable than traditional televisions and monitors. They also have higher resolution than older models.
    - - In the CRT are three electron guns: red, green, and blue. Each of these guns streams a steady flow of electrons, left to right, for each line of your monitor. As the electrons hit the phosphors on the CRT, the phosphor will glow certain intensities. As a new line begins, the guns will then begin at the left and continue right. These guns will repeat this process sometimes thousands of times until the screen is completely drawn line by line.