Wednesday, 9 May 2012

Hardware : Input Devices


Input is any data or instruction that you enter into the memory of a computer.
There are four types of input: which are text, graphic, audio and video.
Input devices are any electronic device connected to a computer and produces input signals.

Input Devices For Text

You can enter data such as text and commands into a computer by pressing the keys on the keyboard.
You can press the keys of a virtual keyboard on the screen.
An optical reader is a device that uses a light source to read characters, marks and codes and then converts them into digital data that a computer can process.

Input Devices For Graphic

A scanner is a device that captures images from photographic  prints, posters, magazine pages and similar sources for computer editing and display.
A digital camera allows you to take pictures and store the photographed images digitally.

Input Devices For Audio

Audio input is the speech, music and sound effects entered into the computer. This can be done using input devices such as a microphone and digital musical instruments like the Musical Instrument  Digital Interface (MIDI) keyboard.

Input Devices For Video

Video input is input of motion images captured into the computer by special input devices.
A Closed-Circuit Television (CCTV) video camera is a type of digital video camera that enables a home or small business user to capture video and still images.
A webcam is any video camera that displays its output on a web page.
A digital video camera allows you to record full motion  and store the captured motion digitally.

Pointing Devices

A pointing device is another form of input device. Pointing devices such as a mouse, trackball, graphics tablet and touch screen are used to input 
spatial data into the computer.
Spatial data refers to data that is continuous and  multi-dimensional.

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