Input Devices
Data are facts, numbers and characters that entered into the computer via keyboard.
Other types of input devices are :
- Mouse
- Joystick
- Light pens
- Scanners
- Camera, etc.
- Keyboard: There are so many keys like Typewriter, Window application, etc.
- Standard keyboard has 104 keys.
- Mouse: It is a pointing devices, scroll wheel, left or right button.
- Trackball: A trackball is also pointing devices.
- VRS( Voice Recognition System): VRS is an input devices, consisting of a microphone or telephone that converts human speech into electrical signals.
- Scanner: Scanner are a kind of input devices. They ae capable of entering information directly into the computer. The main advantage of direct of information is that users do not have to type the information. This provides faster and more accurate data entry.
- Types of scanner:
- Flatbed scanner
- Slide scanner
- Handheld scanner
- Drum scanner
- OMR( Optical Mark Reader): OMR are special scanners used for recognizing a pre-specified type of mark made by pencil or pen.
- Barcode Reader: Barcode reader are special devices used to read barcoded data. Barcode is a specialized code used for fast identifications of items. It consists of a series of small lines known as bars. The actual coding of the bars is the width of the bar not the height. These are primary used for identification of goods such as books, postal packages, badges, etc.
- MICR ( Magnetic Ink Character Recognition): MICR detects the special encoded characters on bank cheque and deposit slips. After detecting the encoded characters the MICR convert them into digital data for the computer.
- OCR (Optical Character Reader): The device is capable of detecting alphabetic and numeric characters on a computer print-out containing complete pages of types text and hand written text.
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