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LU 1(PART 2): COMPUTER SYSTEM (CATEGORIES OF COMPUTERS (embedded computers…
LU 1(PART 2): COMPUTER SYSTEM
FILE MANAGEMENT & DIGITAL MEDIA
file management: methods that ensure computer files are stored in an orderly manner
file management utilities: show files stored on disks & help work with them
applications: provide way to open files & save them in a specific folder on a designated storage device
file location: file specification/ path
digital media
Audio (music, speech & other sound)
examples of file format: mp3,AAC,WAC,WMA
graphics
bitmap graphic is composed of a grid of dots, also known raster graphic
vector graphic
consists of a set of instructions for creating a picture
have file extensions such as .wmf, .ai, .dxf, .eps
advantages of using vector graphics on the web: - consistent quality
searchable
-compact file size
rendering: process covering a wireframe with surface colour and texture
ray tracing: technique for adding light & shadows to a 3D image for further realism
vector vs. bitmap
vector resize better, can be created using vector graphics software, can be converted into bitmap through process called rasterization
bitmap images more realistic, can be created using graphics software, scanner/ digital camera, can be converted into vector using tracing software
video
formats: AVI, MOV, MPEG,WebM etc
transcoding: process used to convert from one digital video format to another format
2 ways of transferring digital video from the Web to a computer
the computers wait until it downloads before play
streaming video
CATEGORIES OF COMPUTERS
supercomputers
wearable technology
head-mounted display
fitness tracker
smartwatch
smart glasses
game devices
stick computer
mobile computers & devices
embedded computers
automobiles
computer devices & office machines
home automation devices
process controllers & robotics
consumers electronics
servers
terminals
personal computers
CONCEPT OF OPEN SOURCE TECHNOLOGY
a concept that promotes free redistribution & access to a product, design or an idea
has source codes
freely distributed
free for developers to modify & redistribute
accessible without restrictions
advantages:
source code availability allows developers to learn & modify
does x depend on vendor
high customizability
4.community-driven
cost must less
disadvantages:
can be modified by novice programmers
lack of quality
problem with compatibility
can be manipulated by hackers
no financial incentive
proprietary software
owned by an individual/company
closed software
commercial-based(paid) / free but with restrictions
examples: - Windows Operating System, macOS, Photoshop
examples:
examples: