DIGITAL DATA Flashcards
(20 cards)
What is digital data?
Digital data is data that is stored using digits.
What digits do computers use?
zero (0) and one (1) - binary number system
What is computer powered by?
Microprocessors which are made up of tiny electronic switches
What can binary number system store?
Text, images, sound, and video
How many bits form a byte?
8
When you press a key on the keyboard, the microprocessors receive the signal and stores it using…
ASCII code
How many bytes do each ASCII code take up?
1 byte
How can computers store a number?
Using ASCII code or as a number value
What is an overflow?
When a SUM value goes beyond the device capacity
What are images made up of?
Pixels
What do each pixel store in an image?
A single colour
Do each colour have its own binary code?
Yes
What method does the computer use to store digital data about photos?
True colour
How many bytes does true colour use to store the information about a single pixel?
3 bytes
What is colour depth?
More bits in colour per pixel
What is resolution?
More pixels in an image = Sharper quality
How do you achieve realistic digital images?
High resolution + high colour depth
What do computers do to continuous data?
Computers must break up continuous data into chunks via sampling process.
What is sampling rate?
The number of sound samples taken per second?
Higher sampling rate = ?
Better sound quality
