In computing, an input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer or other information appliance. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.
Keyboard
In computing, a keyboard is a
typewriter-style device, which uses an arrangement of buttons or keys, to act
as mechanical levers or electronic switches. Following the decline of punch
cards and paper tape, interaction via teleprinter-style keyboards became the
main input device for computers.
A keyboard typically has characters
engraved or printed on the keys and each press of a key typically corresponds
to a single written symbol. However, to produce some symbols requires pressing
and holding several keys simultaneously or in sequence. While most keyboard
keys produce letters, numbers or signs (characters), other keys or simultaneous
key presses can produce actions or execute computer commands.
Mouse
In computing, a mouse is a pointing device
that functions by detecting two-dimensional motion relative to its supporting
surface. Physically, a mouse consists of an object held under one of the user's
hands, with one or more buttons.
The mouse sometimes features other
elements, such as "wheels", which allow the user to perform various
system-dependent operations, or extra buttons or features that can add more
control or dimensional input. The mouse's motion typically translates into the motion
of a pointer on a display, which allows for fine control of a graphical user
interface.
Microphone
A microphone is an acoustic-to-electric
transducer or sensor that converts sound into an electrical signal. Microphones
are used in many applications such as telephones, tape recorders, karaoke
systems, hearing aids, motion picture production, live and recorded audio
engineering, FRS radios, megaphones, in radio and television broadcasting and
in computers for recording voice, speech recognition, VoIP, and for
non-acoustic purposes such as ultrasonic checking or knock sensors.
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