Section 3 - Data Representation Flashcards
How many bytes are in a kilobyte?
1000
How many bytes in a gigabyte?
1,000,000,000
How many bytes in a petabyte?
1,000,000,000,000,000 bytes
What is the biggest number you can represent with 8 bits?
255
What is overflow?
If a number is bigger than 255 and requires a 9 bits or more
What is hexadecimal?
Each nibble is represented as 1 - 16 in one digit so it becomes 1 - 9 and a - f as past 9 the digits have more than 1 character
What is a vector graphic?
It is made of lines and shapes with specific properties such as line styles, line colour, fill colour and start/end point
What is a pixel?
A picture element (pixel) is a single point in an image which can have its own colour set entirely
How do you work out the size of an image?
Size in bits = image width x image height x colour depth
What is an analogue to digital convertor?
The transformation of analogue sound waves to digital, numerical values
What is a sample resolution?
The number of bits to store each sample
What is the sample rate?
The frequency with which you record the amplitude of the sound
What is lossy compression?
Lossy compression is a data encoding method where files are compressed by removing some of the detail.
What is lossless compression?
This is a data encoding method where files are compressed but no data is lost.
What is run length encoding?
Run length encoding is a simple form of lossless data compression in which runs of data (sequences of data all having the same value) are stored using frequency/data pairs
