INPUT DEVICES

What is Input Devices?

Input Devices are used to enter data or information into the computer or other data processing devices.

Here are some Devices as follow:

Keyboard

Mouse
Joystick 
Scanner 
Voice Input and Recognition  System
Optical Mark Reader 
Magnetic Ink Character Recognition 
Web Camera 

Video Camera 

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Short Note over Input Devices : 

Keyboard

Keyboard is the main input device .Programs and any type of data entered into the computer through it . keyboard is attached to the computer, may be it is wired or wireless .A keyboard is similar to the keyboard of the typewriter. It contains alphabets, numbers, special characters ,arrow keys. When keys are pressed it give electric signal which is detected by an electronic circuit called Keyboard encoder.

There are a total of 101 keys (some keyboards have more ) as example:

IBM/PC keyboards

Original IBM PC Keyboard (1981) – 83 keys

Updated IBM PC Keyboard (1984) – 84 keys

AT Keyboard – 84 keys

AT Enhanced Keyboard – 101 keys

US Traditional Keyboard – 101 keys

Enhanced European Keyboard – 102 keys

Windows Keyboard – 104 keys

Windows-based Laptop Keyboard – 86 keys


Apple keyboards

Apple Keyboard with Numeric Keypad – 109 keys

Apple Wireless Keyboard – 78 keys

Apple MacBook Air laptop – 78 keys

Mouse

A computer mouse is a handheld hardware input device that controls a cursor in a GUI and can move and select text, icons, files, and folders. For desktop computers, the mouse is placed on a flat surface such as a mouse pad or a desk and is placed in front of your computer.

 The picture to the right is an example of a desktop computer mouse with two buttons and a wheel.

Scanner

When referring to hardware, a scanner or optical scanner is a hardware input device that optically “reads” and image and converts it into a digital signal. For example, a scanner may be used to convert a printed picture, drawing, or document (hard copy) into a digital file which can be edited on a computer.  

Types of Scanner 

Sheetfed scanner – scans paper by feeding it into the scanner.

Handheld scanner – scans text and images by dragging the device over the page you want to scan.

Card scanner – designed to scan business cards.

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MICR

Short for magnetic ink character recognition, MICR is a font capable of recognition using magnetically charged ink. Computers equipped with the right hardware and software can print or read the character printed in such ink.

MICR font is commonly used to print checks, deposit slips, mortgage coupons, etc.

 There are several MICR fonts. The MICR E-13B font is used in the Canada, Panama, Puerto Rico, UK, and the United States.

 The MICR CRC-7 font was created according to the ISO standards and is a font used in France, Mexico, Spain, and most other Spanish speaking countries.

OMR ( Optical Mark Reader)

Optical mark reading or optical mark recognition, OMR is the process of gathering information from human beings by recognizing marks on a document. OMR is accomplished by using a hardware device (scanner) that detects a reflection or limited light transmittance on or through a piece of paper.

OMR allows for the processing of hundreds or thousands of documents per hour. For example, students may recall taking tests or surveys where they filled in bubbles on paper (shown right) with a pencil. Once the form had been completed, a teacher or teacher’s assistant would feed the cards into a system that grades or gathers information from them.

Voice Input and Recognition  System

Voice input device A device in which speech is used to input data or system commands directly into a system. Such equipment involves the use of speech recognition processes, and can replace or supplement other input devices. 

 A data item or system command is typed and the related spoken word is uttered, several times

Web Camera 

A webcam is a hardware camera and input device that connects to a computer and the Internet and captures either still pictures or motion video of a user or another object.



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