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Bars are codes that represent different numbers. One can see the barcode on the back cover of this book
                 as  well.  A  barcode  reader  emits  a  beam  of  light  laser  beam,  which  reflects  the  barcode  image.  A
                 light-sensitive detector is present in the bar code reader which identifies and reads the bar code image.
                 The bar pattern is changed into numeric code inside the CPU.



                              Microphone

                              A microphone is a voice based input device. With the help of this device, sound or voice
                              is recognised/recorded in the computer and is converted into digital form which is then
                              played or processed by the computer.






                 Digital Camera

                 A digital camera captures images or pictures momentarily and converts
                 the image directly into digital form and stores it in memory. It can then be
                 viewed on the computer or compatible devices.

                 It is available in various models with different specifications that include
                 pixels, sizes and memory. The quality of image captured by digital camera
                 is measured in pixels.


                                   Web Camera

                                   A web camera or a webcam is a type of video camera that captures images or visuals
                                   in real-time and passes data to a computer via USB, ethernet or Wi-Fi. Webcams do
                                   not have built-in storage like a digital camera.
                                   Web camera  is used to create  video links  and allows set up of authentic
                                   video-conference stations. Some built-in webcams can be remotely activated from
                                   far off locations. Webcams can also be used for security and surveillance purposes by
                                   monitoring the captured visuals.


                 Biometric Devices

                 These devices use the physical characteristics of a living being to authenticate
                 its  identity.  These  devices  are  capable  of  scanning  handprints,  fingerprints,
                 retinal information, facial features etc. to compare with a sample and grant
                 access to an individual to a particular device or information. Example: Used in
                 phones for security and used for attendance tracking in offices.

                           Notes

                           Biometric  Sensor  is  a  device  which  captures  unique  information  from  human  body.  The  unique
                           information can be fingerprints, iris pattern, etc. It stores and compares to match the information
                           with the available database.




                                                                             Basics of Information Technology    17
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