Number Systems
Define binary.
A number system that uses only 0s and 1s.
1,000 bytes is equal to what unit of data?
Kilobyte (KB)
What does ASCII do?
Represents characters using 7-bit binary codes.
What is a pixel?
The smallest addressable part/point of an image.
What is sample rate?
The number of samples taken per second.
Define denary (decimal).
A number system that uses digits 0–9.
1,000,000 bytes is equal to what unit of data?
Megabyte (MB)
What does Unicode do?
Represents many characters from different languages using more bits.
What is resolution?
The number of pixels in an image (width × height).
What is sample resolution.
The number of bits used per audio sample.
Define hexadecimal.
A number system using digits 0–9 and A–F.
1,000,000,000 bytes is equal to what unit of data?
Gigabyte (GB)
Define character encoding.
Storing characters as binary values.
What is colour depth?
The number of bits used per pixel to represent colour.
What is lossy compression?
Compression where some data is permanently removed.
Define overflow (in binary).
When a value is too large to be stored in the available bits.
1,000,000,000,000 bytes is equal to what unit of data?
Terabyte (TB)
What is meant by a “character set”?
The range of characters a system can represent.
What is a bitmap image?
An image made of individual pixels stored as binary.
What is lossless compression?
Compression where all original data can be restored.
Define the term “most significant bit”.
The bit with the highest value/place in a binary number.
8 bits is equal to what unit of data?
A byte
Why do modern systems use Unicode instead of ASCII?
Because ASCII doesn’t support enough characters.
What is the formula for calculating a bitmap file’s size in bits?
Width × height × colour depth.
Why does increasing sample rate or bit depth increase file size?
Because more data is stored per second of audio.