3.3 Data Representation Flashcards
How many bits are in a byte?
8
How many bytes are in a kilobyte?
1000
How many bytes are in a megabyte?
1000000
Define the meaning of resolution
The concentration of pixels within a specific area
What is lossy compression?
Lossy compression is a data compression method that sacrifices some information to achieve an even smaller file size than lossless compression
What is lossless compression?
Lossless compression uses Run Length Encoding (RLE). Lossless compression compresses data without losing any information.
What formula can be used to calculate the number of combinations in binary?
2 to the power of N
What is an overflow error?
When the result of a calculation is too large for the number of bits the computer works with.
What is a character set?
A character set is a collection of characters used to represent text in a computer system
What is colour or bit depth?
The number of bits used to indicate the colour of a single pixel. The bit depth is the number of bits available to represent the colour of each pixel.
What is the formula for calculating file size?
Width x height x colour depth
What is metadata?
Metadata is data about data. It is information that is stored with a file.
Define sampling rate
The number of samples taken per second
What is decompression?
The process where compressed data is restored to its original format.
What does Huffman coding analyse?
Huffman coding analyses the frequency with which characters in a body of text are used.
