Input devices are those parts of the computer which accept data in a form that can be utilized by the computer. Thus input devices help us in feeding the data into the computer system. Output devices are those parts which show us the data we desired to extract from the computer. The examples of input / output are :-
A) Input Devices:
A1 : Hand Operated Input Devices
· Keyboard and Mouse are the most commonly used hand operated input devices.
Some of the hand operated input devices along with keyboard and mouse are as follow:
· Track Ball : It is used as an alternate of mouse.and has to move its ball in order to utilize it that causes the pointer to move on the screen.
· Joystick : It is very popular among the people fond of computer games, but today different types of game controllers are replacing them gradually. Joystick is used to control the machine such as crane in the process of building constructions.
· Digital Camera : Digital camera can take the image and also records the videos. The images and videos taken by digital cameras are recorded in files. These files can get copied into the computer that can be further edited for many purposes.
· Microphone : Microphone is used to input the sound. It can be used to enter text in any word processing application with voice recognition software in the computer.
· Touch Screen : There is a network of light rays in touch sensitive visual display unit or in screen that recognizes the touch. Touch screen is used in many mobile phones. They are often used in cash machines and chopping centres.
· Video Digital : Video digital takes the images from video camera or television and stores it into the computer for further use. The video sequences taken by video digital are mainly used in multimedia presentation.
Scanner : Scanner is used to convert an image into its digital form. It is similar to photocopier but it makes digital copy of an image instead of its hard copy. It is used to scan the text with the software optical character recognition.
Graphic Tablet : There is a flat pad on the graphic tablet upon which an user writes with the help of a special pen. Pictures can also be drawn on the screen using that pen in this way.
B) Output Devices :
The means through which computer gives output are known as Output Devices. Some of the most popular output devices are as follow:
- Monitor
- Printer
- Projector
- Sound Card
- Speaker
- Video Card
Projector
Projector is that hardware device which projects an image on the flat surface like computer screen. These devices are generally used in meetings, seminars and presentations because each person can easily see the image projected by it sitting in a big room.
Sound Card
It is also known as Sound Board or Audio Card. Sound card is an expansion card or unified circuit that enables computer to produce sound through speaker or headphone
Speaker
It is the device which presents the sound produced during any programme. This is connected to sound card and gives the sound produced by card in the form of output.
Video Card
It is also known as Graphics Card, Video Board or Video Controller. This is an internal circuit board that allows the image displaying devices like monitor to display the images.
Integrated Input and Output Devices :
Modem is a connector and is used both as input and output device. Thus, modem is both an input device and an output device. Similarly, we can say the latest touch screen display units also act as input and output devices simultaneously, as we can send instructions to computer by merely touching the screen and then results are also displayed on the same screen.
MODEM : Full form of modem is MOdulator and DEModulator. The modem is a converter of analog to digital and digital to analog. Thus, we can say that a modem is a mechanical means of translating computer information or retrieving information from the Internet via a phone line. It needs communication software in order to work and can be attached internally or externally. Internet transmission can also take place over an ISDN line or the even faster T1 line. No modem is necessary for these types of transmission but you will need an ISDN adapter. Modems are measured by the speed that the information is transferred. The measuring tool is called the baud rate. Originally modems worked at speeds below 2400 baud but today analog speeds of 56,000 are standard. Cable, wireless or digital subscriber lines can transfer information much faster with rates of 300,000 baud and up.
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