Input And Output Devices Of The Computer

Multimedia Devices

Multimedia devices can handle audio, voice and music and video, or motion pictures.

Sound Card

The sound card is the device responsible for transforming the sound of the voice, which in its natural form are analog in binary number representations for computer processable, these transformations are known as analog to digital conversion, example: to capture the voice microphone through the sound card makes digital sounds for the computer to the store.A sound card can connect a microphone or headset, a set of speakers or headphones, joystick, sound equipment to amplify the signal.

                                                 

Videoconferencing

Videoconferencing systems are designed for real-time transmission of live video. These systems capture the image in one location and broadcast live and let live over local networks, intranets or the Internet at various sites in different geographic locations.

Output Devices

Printer

Also known as a hard copy device. There are basically four types of printer:Matrix: it has a head that travels back and forth over a bar. The print head has several needles hitting the role of an ink ribbon to form charactersInkjet: create the image directly on the paper to eject a jet of ink through a nozzle.Are the most widely used and print high quality images in color.Laser: has an internal processor that interprets the data received from the CPU and controls the laser, which selects the points in a special drum creates an electrical charge supplied by the "toner" and transfers the data to paper.Thermal: is mostly used for printing documents from laptops. Its operation is based on heat generation on special paper.The plotters or plotters also considered output devices: They are great printers that serve primarily to professionals in civil engineering and architectural drawings for printing.

Fixture by Deployment.



Screen or Monitor

Its main function is to make visible the results of a job, but not all credit is theirs. To view any image on the screen is essential to use the graphics card or video card, which is responsible for transforming the digital signal generated by the computer processor into an analog signal which is what "gets" the monitor.

The computer stores the graphics in the RAM in the form of a series of bits. RAM sends graphical data to the video card, which stores them in a special memory called video memory and then converted into an analog signal that is understood by the monitor.

The monitor then takes care of converting the bit that handles the computer so that it can understand. Thus, the user can see on the screen what you are typing at the same time correcting mistakes, choose different fonts and change the layout of the document, among many other options.

Storage Devices

Are those which are permanently stored programs and data needed by the central processing unit, CPU for its operations and processes as opposed to main memory where programs and data are stored temporarily and are lost as soon as you turn the computer off , storage units can be recorded programs and data over time, until they are deleted or removed by action necessary for that purpose. Currently three technologies are basically used to store information:

Magnetic Technology:
The surface of the storage media is coated with magnetic material (similar to the magnets), sensitive to the magnetic field.The units have magnetic read heads - writing, they contain electromagnets that generate a magnetic field to be traversed by a magnetic current in the recording process, the heads are a current, magnetizing particles of the medium and record and information. The main storage media are floppy disks, hard disks and magnetic tapes.
Optics:
Optical storage technique locates the information by laser, consisting of a light beam focused and coherent approach that allows very small areas accurately. When the disc spins at high speed some areas reflect the laser light into a sensor, while others disperse.Within the major optical media are compact disk or CD, and DVD (Dynamic Versatility Disc).
Magneto-optical (MO):
This technology combines the advantages of magnetic media with the optical. A MO disc is an optical disc capacity and ease of rewriting magnetic media. MO disks are currently available in various sizes and capacities, its appearance is very similar to floppy disks (diskettes), but have vastly superior capabilities and require a special device, called ZIP, for reading and writing.

 

 

Input Devices Commonly Used

Keyboard:

The computer keyboard is very similar to that of a conventional typewriter, except that it has some additional keys to perform certain special functions.The keyboard is designed for entering text, such as alphabetic and numeric data, and commands, either in writing, using keyboard characters, or by specialized function keys.When you press each key generates a special code that is interpreted by the processing unit and allows the formation of coding sequences with specific meanings and functions to the work you want done.

The keyboard can be divided into the following key groups:

 

Keyboard functions:They are located along the top of the keyboard. Can be used individually or in conjunction with other keys.

Keypad:It is located on the right side of the keyboard, similar to a calculator to facilitate the rapid entry of numerical data. At its core are the digits 0 to 9, and sides of these special characters as signs (,-,*) and others, like Num Lock and Enter.

Cursor Control:Group keys with arrows indicating the direction in which advances the cursor on the screen up, down, left or right.

 Mouse

Takes its name from its resemblance to this animal. It is a device consisting of a small container with a ball on the inside that looks on the bottom and manipulated moving along a surface which is usually a rectangular piece of rubbery material covered in soft fabric, called mouse pad, pad, or pad.

Mouse Management

when done, the object is shaded, indicating it has been selected for an operation or process.
Point and click:Place your mouse over different parts of the screen and click once with the left button, or place on objects, and icons of the screen, and clicking are the operations to identify and select, or point and click; Double Click:Is to perform the same operation before, but now is double-clicked for the object. The double click is to press, release quickly, press again and quickly release the button, in a sequence of two.

Point & Drag:This function is very important for functions such as moving window, expand or downsize, or move text, graphics and other objects used in different program. You can submit as agile and quick operations like copying files from one folder to another or from one unit to another, and print a document, drag them from the folder where the icon representing the printer.

A LittleTour Of Input And Output Devices