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Input Devices Aldo and Nadia

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What are input devices? Input devices are any machine that feeds data into your computer. Keyboard Pointing Devices Scanner OMR (Optical Mark Recognition) OCR (Optical Character Recognition) MICR (Magnetic Ink Character Recognition) Magnetic Strip Card Digital Cameras, Digital Video Cameras And Webcams Biometric Scanners Sensors Audio Input Devices And Technology

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Keyboard The keyboard is a common input device. There are different types of keyboards but the most used keyboard is the QWERTY keyboard. There are other keyboards like the Numeric keyboard which only have keys that input numbers. E.g. ATM (Automated Teller Machine)

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Some QWERTY keyboards might have numeric keypads on the right-hand side.

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Keyboard ADVANTAGESDISADVANTAGES Keyboards are very useful and are often used at work. Majority of people know how to use a QWERTY keyboard so its most of the time available and helpful. You need to know the layout to be able to touch- type.

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Pointing Devices Point devices are used to select and point at objects that are shown on the monitor screen. Mouse Joystick Trackpad Graphic Tablet

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Pointing Devices MOUSE A mouse is used to control the pointer on the screen. This can be controlled by a ball underneath or a optical mouse with controls the pointer using light. JOYSTICK A joystick is a lever commonly used in a game pad. Such as car games so that gaming is more accurate as it depends on how you use the joystick. TRACKPAD A track pad is like a mouse but its a square pad that lets you control the pointer with your fingers. GRAPHIC TABLET A graphic tablet is a rectangular or square pad that lets you draw on any editing software with a stylus.

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Pointing Devices ADVANTAGESDISADVANTAGES Its easier to use it rather than using a keyboard. Its easier to access most features of the software that is being used. It can be difficult to control the on screen pointer. It can take longer to input text with a pointing device rather than a keyboard.

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Scanners A scanner reads printed data into the computer. HANDHELD SCANNER - A handheld scanner scans the image or document as its dragged over it. FLATBED SCANNER - A flatbed scanner is a scanner that is usually on top of a printer simply used for photocopying. SHEET-FED SCANNER - A sheet-fed scanner scans the image or document as it goes through the roller. BARCODE SCANNER - A barcode scanner reads a pattern of bars which contain data.

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Scanners ADVANTAGESDISADVANTAGES It is easier and faster to scan printed information and images on paper to an electronic form. Its not very accurate since the data input may not be confirmed.

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OMR (Optical Mark Recognition) OMR is a process of capturing physically marked data from a document form. Such as a survey or test. The OMR reader is suppose to detect the marked areas on the paper. It will determine the meaning of the data where the mark is positioned on the paper.

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OMR (Optical Mark Recognition) ADVANTAGESDISADVANTAGES It is faster and less expensive. The person filling in the form is responsible for their accuracy to doing the survey. The OMR should be used accurately as the position of the paper affects the precision of the way you input it. There are no verification checks so mistakes cant be detected.

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OCR (Optical Character Recognition) The OCR identifies printed or written text characters by a computer. Which the computer will attempt to recognise the characters as accurately as possible. Then the data is stored as text that can be word-processed.

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OCR (Optical Character Recognition) ADVANTAGESDISADVANTAGES Texted printed on paper can be converted to electronic form and edited rather than copying out the word one by one which would take longer. It is not alway accurate so the text has to be checked and verified carefully.

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Magnetic Ink Character Recognition Magnetic ink character recognition identifies data printed using a special magnetic ink. Instead of using a scanner that relies on reflected like to detect characters, the would depend on on the magnetic behaviour of the ink.

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Magnetic Ink Character Recognition ADVANTAGESDISADVANTAGES It saves time and its accurate. Magnetic ink is expensive. Any character printed in normal ink will not be detected.

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Magnetic Stripe Card A magnetic stripe card reader reads information from a magnetic stripe on a card. This is commonly used to access buildings or used as bank or credit cards. The stripes store permanent value, such as an account number or a changeable value, such as the amount of cash you are allowed to withdraw from a cashpoint.

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Magnetic Stripe Card ADVANTAGESDISADVANTAGES A portable form of identification. The data recorded can easily and quickly be input directly into a computer. It can be affected by electromagnetic radiation. Data on the magnetic stripe can be record. So it gives an open opportunity for criminals to commit identity theft.

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Smart Cards A smart card is similar to a magnetic stripe card except it uses a microprocessor chip embedded in it. It is very easy and most useful card because its advance in use.

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Smart Cards ADVANTAGESDISADVANTAGES Another portable form of identification. The data recorded can be input directly into a computer easily. The data is harder to hack and is more secure. It can automatically update data during transaction. It can still be affected by electromagnetic radiation. Criminals can still have an open opportunity to commit identity theft.

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Digital Cameras, Digital Video Cameras And Webcams Digital cameras store pictures on a memory card and from there the pictures can be input directly into the computer.

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Digital Cameras, Digital Video Cameras And Webcams ADVANTAGESDISADVANTAGES Back up is easier and more reliable. Digital photos and videos can be viewed on other devices such as phones and television. You can email people picture and videos. Uses up backing storage. High quality photos and videos can be in very large files so emailing it or broadcasting it over the internet will slow down the network.

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Biometric Scanner A biometric scanner is a pattern recognition which recognises a person's physical features. This can be face recognition, fingerprint matching, iris retinal scans, voice recognition and hand geometry. Biometric scanners can be used to access buildings, rooms, safes and phones. (Iphone 5S)

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Biometric Scanners ADVANTAGESDISADVANTAGES You dont need to carry any form of personal identification but yourself. The person has to be present so identity theft is nearly impossible. Its not as accurate because it wont recognise people at times making it hard to access personal identification, places or important data.

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Sensors Sensors are a direct way of recording data about the environment. For example, sensors can be used to record light intensity, temperature and pressure. They can be used extensively for data logging and control application such as automatic washing machines and cookers, air conditioning and central heating controllers, burglary alarm systems, control factory production lines etc.

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Sensors ADVANTAGESDISADVANTAGES It is faster to input data directly. It is more accurate than someone manually inputting the data. Sensors can record data that people do not sense/accurately (e.g. heat) They cant interpret the data. Data must be processed. Sensors detect a very restricted range of different types of data. May not be accurate due to malfunctions of the sensors.

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Audio Input Devices And Technology Audio input devices allow you to input sound directly into a computer. Touch-Tone Telephone Microphone Voice Recognition Speech Recognition Natural Language Processing

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Audio Input Devices And Technology TOUCH-TONE TELEPHONE - Is the sound when you press a button which helps assure you that youve input the number correctly. MICROPHONE - Records sound and voices to give your voice commands or to communicate over the internet. SPEECH RECOGNITION - It is commonly used for voice command systems. It is the translation of spoken words into text. NATURAL LANGUAGE PROCESSING - It is when a computer processes a sequence of instructions or data through natural language.

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Audio Input Devices And Technology ADVANTAGESDISADVANTAGES People dont have to know how to operate a keyboard and can just use an audio input device. It is faster to input text rather than using a keyboard. It is useful for people with disabilities. Voice recognition might not be accurate because peoples accent and voice might not be recognised. The computer might not recognise the full range of words used. Some words that are pronounced the same might have different meanings.

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Remote Control A remote control device is a handset device that controls other devices. For example, television, video player, recorders etc. The transmitter in the remote sends out a pulse of infrared light when a button is pressed. A receiver is built in the remote in a suitable position to easily receive the infrared light pulse varies.

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Remote Control ADVANTAGESDISADVANTAGES Less movement and energy needed to operate the device. Hidden devices can be controlled. If device is only controlled by a remote control, if the remote is lost, then the device cant be used.

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Quiz: 1.Which of these is not an advantage of OMR? a.Input is faster and less expensive due to no requirement to type in information written on the paper form. b.The person who fills in the form is responsible for the accuracy of the information. c.Text printed on paper can be converted to electronic form and edited. 2.What does OCR stand for? a.Optical Character Recognition b.Optical Cipher Recognition c.Optical Code Recognition 3.Which of these is an example of a pointing device? a.Graphics Tablet b.Hand-held Scanner c.Keyboard 4. What is a telephone an example of? a.Audio device b.Sensors c.Biometrics 5.Which of these is not an input device? a. Scanners b.Monitor c.Mic

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Answers: 1.C 2.A 3.A 4.A 5.B