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IT PROJECT

ON

INPUT DEVICESPROJECT by DARSHAN MANEKROLL NO -63

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Q. WHAT IS AN INPUT DEVICE?

A. Any machine that feeds data into a computer.For example, a keyboard is an input device,whereas a display monitor is an output device.

Input devices other than the keyboard aresometimes called alternate inputdevices. Mice,trackballs, and light pens are allalternate input devices.

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In computing, an input device is any peripheral (piece

of computer hardwareequipment) used to provide data

and control signals to an information processingsystem such as a computer or other information

appliance. Input and output devices make up the

hardware interface between a computer and

a scanner or 6DOF controller.

Direct input is almost necessarily absolute, but indirect

input may be either absolute or relative. For example,

digitizing graphics tablets that do not have an embedded

screen involve indirect input and sense absoluteositions and are often run in an absolute in ut mode

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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 computer commands.

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Type several characters into the active browser window to navigate to any

link with that text in it

If you repeat the same character, it will start to cycle through all the links

that begin with that character. However, if it can find a match with the

exact string you've typed, such as "oo" in "woods" it will go there first.

Typing "o" more times will then cycle through the links that start with "o".

Use the backspace key to undo the last character typed.

Type a ' before your string to search only links. Type / before your string

to search all text.

To cancel a find, change focus or scroll, press Escape, or wait for thetimeout.

Works with any Gecko HTML content window - embedded clients, IM

conversation window, help, etc.

Works with IME for input of Chinese, Japanese, Korean, etc.

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In computing, a mouse is a pointing device thatfunctions by detecting two-dimensil motion

relative to its supporting surface. Physically, amouse consists of an object held under one ofthe user's hands, with one or more buttons.

The mouse is now one of the most popular

input devices the mouse is a small box with around ball on the underside and one or morebuttons on the top.

A cable attaches the mouse to the terminal or

microcomputer

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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.

The mouse allows you to manipulate a pointer or arrow on screen. As you

roll the mouse across a flat surface,the screen cursor too moves in that

direction(this movement is measured in hundredths of an inch). For

example, if you roll the mouse forward and to the right,the cursor moves

up and to the right on the screen.

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Lines of different widths and sizes representingdata, that when read will determine what thescanned object is.

Barcodes are often used to help organize and indexinformation or prices about an object.

Barcodes used by the U.S. postal service that helpsspeed the delivery of mail is another perfectexample of how a barcode could be used. In thepicture to the right, is an example of what a barcodefor an address may look like.

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A hardware device capable of printing out adhesive barcodes that can be

attached to a product. This helps identify the product or a company keep

track of its inventory.

The barcode scanners consist of an internal decoder and a cable, which

are connected to the computer through compatible ports.

It consists of a light source, a lens and a photo conductor translating

optical impulses into electrical ones. Additionally, nearly all barcode

readers contain decoder circuit. It analyzes the barcode's image data

provided by the photo conductor and sends the barcode's content to the

scanner's output port.

Advanced readers use laser-scanning technology. Barcode readers are

available in several forms like in hand-held, hands-free, wearable, scan

engines, laser or digital.

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A microphone (colloquially called a mic or mike; bothpronounced /mark)[1] is an acoustic-to-electric transducer or sensor that converts soundinto anelectricalsignal. Microphones are used in many applications such

as telephones, tape recorders, karaoke systems, hearingaids, motion pictureproduction, live and recorded audioengineering, FRS radios, megaphones,in radio and television broadcasting and in computers for recordingvoice, speech recognition, VoIP, and for non-acoustic purposes such

as ultrasonic checking or knock sensors Most microphones today use electromagnetic induction(dynamic

microphone), capacitance change (condensermicrophone), piezoelectricgeneration, or light modulation toproduce an electrical voltage signal from mechanical vibration.

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A mic that is equally sensitive to sound from all sides iscalled an omnidirectional mic.Omni mics are great for

picking up natural room sound and are also very good forcapturing group vocals.. Omni mics also tend to be more"forgiving" because they pick up sound even when the micis rotated at different angles.

A unidirectional mic is sensitive to sound only in a specificdirection. The most common type features a cardioid (heart-shaped) pattern that rejects sound coming from behind themicrophone. This can be very useful for reducing bleedwhen recording a guitar amp sitting next to a drum kit. Asupercardioid mic has an even narrower pickup pattern,further reducing bleed from nearby sound sources.

Cardioid and supercardioid mics are good for crowdeds aces like rou recordin sessions where multi le