Section Seven - Data Representation
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Fill in the gaps: 1) apply (2) operators to (3
(1) Logic Gates (2) Boolean Operators (3) inputs
Complete the sentence: NOT gates takes a single Input…
…and gives a single output
What is a feature of a NOT gate?
The output is always the opposite value to the Input
Finish the sentence: AND gates take two inputs…
…and give one output
Finish the sentence: OR gates take two inputs…
…and give one output
What is the size of a bit (b)?
A single binary digit (1 or 0)
What is a parity bit used for?
To check for errors in binary numbers?
What is a Binary Shift?
Used to Multiply or Divide numbers, every bit is moved along to the left or the right
When do Overflow Errors occur?
When a number has too many bits?
What are Images stored as?
A series of pixels
What increases the file size of a image?
Increasing the Colour Depth and Resolution
What do devices need to display images?
Metadata
What does Metadata include?
File format, height, width, colour depth and resolution
What factors affect the size and quality of sound files?
Sampling intervals Sampling frequency Sample size Bit rate
What are the two types of compression?
Lossless and Lossy
How does Lossy compression work?
Works by permanently removing data from the file
How does Lossless compression work?
Works by making the file smaller by temporarily removing data to store the file and restores it to original state when it’s opened