Summary
Summary Grade 11 CAT Theory Notes: Inputs and Outputs
- Course
- Computer Literacy
- Institution
- 11
Grade 11 Theory Notes on the Module: Inputs and Outputs from the IEB textbook. Achieved a Distinction in Grade 11 and Grade 12.
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Input and OutputInput
Running software with instruction
Data that must be processed
Image capture
Digital cameras:
Smartphones, compact cameras, top-end DSL
Images already in digital form
Quality depends on sensor size, zoom type, resolution(MP), ISO rating
Scanners:
Input device that converts images into digital format
Quality determined by resolution (dpi) and colour depth
Higher dpi + colour depth give higher quality but bigger file sizes
OCR software converts scanned images to editable text
Quality of scanned image depends on quality of original
Biometric Input:
Capturing unique biological features of a person
Used for security reasons
More secure that passwords
Additional hardware + software may be needed
Input at ATMs:
Dedicated device, gets input from user + other sensors
Interact via touch screen/keypad/buttons
Thieves use card skimmers + cameras to steal date from cards
Input into POS Systems:
Uses barcodes + RFID tags to record stock items in database
Faster processing, better accuracy + better stock control
Touch Screens:
More natural way to interact with computing devices
Pen tablets use stylus for higher precision
Intuitive to use, allows drawing + gestures, no keyboard needed
Typing is not as fast + screen can get dirty
Better for handheld devices
Data Collection:
Capture data using variety of inputs (sensors, cameras, radio signal)
Especially useful I situations where difficult/dangerous for humans
More accurate + faster than human input
Difficult to repair – inaccessible location
Input into smartphones and consumer tablets:
Multiple types of user-controlled input
Touch screen
Hardware buttons
Voice recognition apps useful for disabled users
Other input types operate on system level
GPS
WiFi
Alternative keyboards
Mobile devices create virtual keyboards – image on screen
Virtual keyboards projected onto surface using laser/led light
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