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On the back of credit/debit cards, there is a thin black stripe (known as a magnetic stripe). Such stripes contain
coded information in the form of magnetic marks and are read when the card is inserted into the ATM.
Light Pen
Light Pen is a pen-like device which uses a light-sensitive detector to select or
draw objects on the display screen.
It is similar to a mouse, except that with a light pen one can move the pointer on the screen by touching it
on the objects on the screen. When the pen is moved across the screen, its position is sensed because of the
light it emits.
Do you know?
A Tablet PC is slate shaped notebook computer. Its technology allows the user to operate the computer
with stylus, digital pen or fingertip, instead of using a keyboard or mouse.
Barcode Reader
Barcode Reader is a popular scanning device that reads the bar codes. Bar codes
comprise adjacent vertical black bars of different widths.
Bars are codes that represent different numbers. One can see the bar code on the back
cover of this book as well. A bar code reader emits a beam of light (laser beam), which
re ects the bar code 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
Microphone is a voice-based input device. With the help of this device, sound or voice is
recognized/recorded in the computer and is converted into digital form which is then played or
processed by the computer.
Digital Camera
Digital Camera captures the image or picture 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 the image captured by a digital camera i s
measured in pixels.
58 Touchpad Information Technology-IX

