ICT - INFO 1 - INPUT
- Created by: luiop100
- Created on: 16-05-16 09:53
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- Input
- Data types
- Sounds
- sound fed through a microphone creates an analogue signal
- once it enters a computer it is converted into a digital signal
- Can be entered through instruments like a MIDI
- Images
- Numbers
- Moving images
- Recorded onto a hard disk, DV tape or a DVD
- Can be edited using specialist software
- digital cameras and phones can record short bits of footage
- Webcams
- Used for video conferences
- reduced file size due to not very high quality
- Continuous stream of sent video images
- Digital cameras
- some have inbuilt storage or have a SD card
- connected via cable or wirelessly
- Pictures can be viewed on an inbuilt screen and deleted if required
- mobiles have high quality inbuilt cameras
- Recorded onto a hard disk, DV tape or a DVD
- Text
- Sounds
- Manual input
- Keyboard
- Typically QWERTY
- Layout varies from country to country
- Ergonomic keyboards increase comfort and reduce the chance of injury.
- Mobile devices have smaller keyboards called keypads
- Mouse
- Connected via cable or wireless
- Optical and mechanical varies
- Mice have 2-3 buttons
- Trackball
- Ball on the surface
- Laptops often have trackpads
- Concept keyboard
- Divided into areas fit for a purpose
- Special software required
- Covered in plastic film
- Input for disabled individuals
- Used at restaurants and check outs
- Touch screen
- Senses when an area is being touched
- Uses embedded wires or infra-red light beams
- Special software required
- Use a finger or a stylus
- Software that converts written words into characters can be used.
- Used in public areas as they are quick and easy.
- Graphics Tablet
- AKA digitizing tablet
- Mainly used for drawing
- More natural than using a mouse
- Speech recognition
- User speaks into a microphone
- Words are compared to a sound dictionary and converted into readable text
- Not reliable due to voice and accent differences
- Complicated by word meanings
- To improve quality words must be said individually
- Keyboard
- Automatic input
- Credit card reader
- Magnetic ***** or chip-and-PIN
- Magnetic ***** cards are swiped through a reader, but has limited data storage
- Chip-and- PIN cards can hold a lot more data and do not scratch.
- You cannot use a smart card without providing a pin.
- Radio frequency ID
- Uses radio waves to transmit a unique ID for objects.
- Used for tracking positioning
- Also called smart labels or radio bar codes
- Scanners
- Turns paper based images into digital ones
- Flat-bed
- Put the document on the flat glass plate.
- Barcode scanner
- Variation of flat-bed scanner
- Hand-held scanner
- Used when an item cannot be lifted onto a scanning plate
- Sheet-feed scanner
- The paper is moved not the scanner
- Drum scanner
- Creates high resolution images
- The higher the resolution and quality the larger the file size
- Resolution is measured in DPI
- Used as the basis of more complex devices such as OMRs and OCRs
- Optical Mark Recognition (OMR)
- Used for multiple choice exams and lottery tickets
- Uses a light beam to sense positioning
- Each page has to be specially printed
- Expensive to use
- Inflexible as an input method
- Optical Character Recognition (OCR)
- Paper based documents are scanned and converted into computer characters
- Commonly used to input forms filled out by employees
- Simplifies data iinput
- Quicker than manual input
- Difficult to process non upper case writting
- Used to scan in and mark exam papers
- Bar-code reader
- Black and white lines represent a number
- Used in EPOS systems
- Each barcode represents a primary key in a database
- In-built error checking via a Check-Digit
- Saves time and reduces typing errors
- Magnetic Ink Character Recognition
- Almost exclusiuve to banks
- Prevents acceptance of fake cheques
- Not used that often due to decrease in cheque usage
- Credit card reader
- Special purpose
- Disability features
- Pointer speed
- Speed of clicks
- Foot mouse
- Trackball
- Games controllers
- Made to support fast response times
- Senses motion and communicats via bluetooth
- Relevant to the game
- Choosing an Input device
- Type of data?
- Volume of data?
- Cost?
- Disability features
- Data types
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