Computer input devices

voice-
recognitionsystem
that converts voice into text, so you can dictate text directly onto your 
word processor or email program. You can also control your PC with voice commands; 
this means you can launch programs, open, save or print files. Some systems let you 
search the Web or chat using your voice instead of the keyboard. 
E digital camera
Photocamera that paces images in digital memory 
Joystick 
A joystick for a computer is adivice that communicates with a computer and transmits 
information to it by switching to the corresponding parties.It can be either wired or 
wireless (yonyon is done using a light or radio signal). 
Webcamera
Webcam it helps to UTK video conferencing and video conferences over the internet 
Scanner 
The scanner is an input device from the document to the exposure
Microphone 
The functions of the microphone in a computer is to transmit sound through the internet 
at video conferences
Graphics tablet
A graphics tablet (also known as a digitizer, digital graphic tablet, or digital art board)is a 
computer input divece that enables a user to hand-draw images, animations and graphics, 
with a special pen-like stylus, similar to the way a person draws images with a pensil and 
paper.These tablets may also be used to capture data or handwritten signatures.It can also 
be used to trace an image from a piece of paper that is tapted or otherwise secured to the 
tablet surface.Capturing data in this way, by tracing or entering the corners of linear 
polylines or shapes, is called digitizing. 
Touch screen
Atouch screen is a computer display screen that serves as an input device. When a touch 
screen is touched by a finger or stylus, it registers the event and sends it to controller for 
processing. 
A touch screen maycontain pictures or words that the user can touch to interact with the 
device. 
Light pen. 
A light pen is a computer input device in the form of a light-sensitive wand used in 
conjuction with a compyuter’s cathode-ray tube (CRT)display. 
Barcode reader
A barcode reader (or barcode scanner ) is an optical scanner that can read printed barcode 
and send the data to a computer.Like a flatbed scanner, it consists of a light source, a lens 
and a light sensor translating for optical impulses into electrical signals. 

---

Touchpad 
A touchpad or trackpad is a pointing device featuring a tractile sensor a specialized 
sueface that can translate the motion and position of a user’s fingers to a relative position 
on the operating system that is made output to the screen.Touchpads are a common 
feature of laplot compyuters as opposed to using o mouse on a desktop and are also used 
as a substitute for a mouse where desk space is scarce.because they vary in size they can 
also be found on personal digital asistants(PDAS) and some portable media players. 
Wireless touchpads are also available as detached accessories. 
Trackball 
A trackball is a pointing device consisting of a ball held by a socket containing sensors to 
detect a rotation of the ball about two axes-like an upside down mouse with an exposed 
protruding ball.The trackball’s buttons may be situated to that of a mouse or to a unique 
style that suits the user.