Download - Input and output devices
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Presented to : Tanvir Bin Azgar (Sir)
Presented by :
Muhammad Abdullah ID : 142-0076-511
Department Of EEE
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Input and Output Devices
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Input and Output Devices
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Introduction
Do you ever wonder how information gets into your computer and how comes out in a form you can use ? It is possible with the help of input and output devices.
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Input DevicesDefinition :
“An electromechanical device that can be used to enter data and instructions into a
computer.”
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Keyboard“A keyboard is a human interface device which is represented as a layout of button or keys.”It has some Features as• Typewriter keyboard with numeric keypad• Special purpose keys• Toggle and combination keys
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Pointing DevicesDefinition : “An input device used to control a pointer on the screen.”
Mouse:“mouse can be used to Control and manipulate cursor movement on monitor.” Types of Mouse : i) Mechanical ii) Optical iii) Cordless or wireless
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Some pointing devices are :
TrackballPointing StickJoystickTouch PadTouch Screen Light Pen
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Optical Input Devices“optical input devices that uses light as a source of
input. They eliminate the need for manual entry of data, thus accuracy increases.
Scanner:“scanners can be used to copy the image or text on paper into a digital format that can be used by the computer.”
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Other Optical Input Devices are:Optical scannersFlatbedPortable
Bar code readers:“A Barcode Reader is an electronic device which is used for reading printed barcodes. This device directs a light beam across the bar code while it measures the amount of light which is reflected back. “
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Character and mark recognition devicesScanners that recognize special characters & marks Magnetic ink character recognition (MICR)Optical-character recognition (OCR)Optical-mark recognition (OMR)
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Audio Input DevicesDefinition :
“Audio input devices record the analog sound and convert it into digital form for further processing.”Some Audio input devices are :
Voice recognition Microphone Musical Instrument Digital Interface
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Video Input Definition : “video input devices that can be used to entering full motion recording into a computer.“Some video input devices are
Digital Camera webcam Video capture card
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Output DevicesDefinition
“Output devices can be used to receive information from the computer “
The output can be in two forms:
Soft copy
Hard copy
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MonitorDefinition
“A monitor is a peripheral device which displays computer output on a screen . Screen output is referred to as soft copy”
Features Resolution-pixelsDot pitchRefresh ratSize
Types of monitors Cathode Ray Tube (CRT) Liquid crystal Display (LCD)
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Printer Definition
“A printer is a peripheral device that produces a physical copy or hard copy of the computer’s output.”
Types of Printer :
Impact Printers • Dot Matrix Printer• Daisy Wheel Printer
Non Impact Printers• Laser Printer• Ink-Jet Printer • Thermal Printer
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PlotterDefinition
“A plotter is an output device that is used to produce high quality graphics in a variety of colors.”
Types of PlotterFlatbed PlotterDrum plotter
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Audio output DevicesDefinition
“Audio Output Devices can be used to translates audio information from the computer into sounds that people can understand.”
Common audio output devicesSpeakersHeadphones
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ProjectorDefinition “Projector can be used to displays
computer information on big screen so that many will able to see the show.”
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Computer Output Microfilm (COM)This technology is used to record computer
output as a microscopic film images.Information is recorded on a roll of film.COM devices are used applications where
there are large volumes of data.
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Combination Input and Output Devices
Many devices combine input and output capabilitiesFax machinesMultifunction devicesInternet telephones
known as Telephonyand Voice-over IP (VoIP)
Terminals
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Fax machinesDefinition :
“A fax machine refers to a device or equipment that does telephonic transmission of scanned material. It scans the original document and converts it into a bitmap. It then uses electronic signals to send the document to another recipient. “
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TerminalsAn input and output deviceConnects to a mainframe or serverTypes of terminals
Dumb terminal Intelligent terminalNetwork terminalInternet terminal
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ReferenceComputer Organization & Design (4th Ed), Patterson and
Hennessy, Morgan Kaufmann 2008.Digital Design and Computer Architecture, Harris and
Harris, Morgan Kaufmann 2007.Structured Computer Organization (5th Ed),Tannenbaum,
Prentice-Hall 2005.
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