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
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.
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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