Digital Data Flashcards
How many bytes are in a kilobyte
1024 bytes
What is information
When data has been processed and given meaning
What are the data types
Numeric, date/time, character/string
What is a pixel
The smallest Unit of a digital image that can be displayed and edited
Image resolution
The qualify of an image
The greater the resolution, the greater the file size
Bitmap graphics
Store details about every individual pixel of the image
Size can be large
It can be compressed
Vector -based graphics
Store information about the components that make up an image
Components are based on mathematical objects
Streaming
Allows a video to be viewed ou a website without a time delay.
Buffer
Part of the memory used to store a downloaded part of a video before watching it
Sample rate
Number of audio sound samples captured per second to represent the sounds digitally
Bit depth
The number of bits used for each sound sample
Bit rate
The quantity of data measured in bits that is processedin a givenamount of time
What are frequency samples measured in
Hertz (Hz)
Data portability
The ability to transfer data from one computer to another without having to re-enter the data
JPEG
Joint photographic experts group
Supports compression of images
TIFF
Tagged image file format
Store bitmapped graphics
PNG
Portable network graphics
Allow data compression of bitmapped graphics
PICT
Standard file format for apple graphics
GIF
Graphics interchange format
Supports bitmapped image file format
Animated GIFs combine a series of GIF images and display them one after the other
Txt
A plain text document that contains no text formatting
CSV
Comma-separated value
Text format file used by database and spread sheet applications
RTF
Rich text format
Used for text-based documents eg -word processing
MP3
File format for compressing a sound
MP4
Compresses both sound + video
MIDI
Musical instrument digital interface
Allows sound samples to be interchanges between different digital musical instruments
MPEG
Motion pictures experts group
A set of standards for compressing digital videos
AVI
Audio video interleaved
Multimedia file format
WAV
Windows audio waveform
Stores audio bit stream on PCs
WMA
Windows media audio
Audio data compression file format
Data compression
Used to reduce file size while maintaining the qualifyof the data contained in the file
Lossy compression
Reduces the tile size by removing some data. This can result in a small reduction in the qualify of an image
Example- JPEG
Lossless compression
Maintains the qualify of the file, therefore no data is lost.
Example- winzip
