4.5.6 Representing Images, Sound And Other Data. Flashcards
What is analogue data?
No limits to the values that the data can take in.
What is digital data?
Discrete, meaning it can onlt take particular values.
What range of values can analogue data take?
Any range.
What range can digital data take?
One of a specified range of values.
How often can analogue data change?
As frequently as required.
How often does digital data create?
At specified intervals.
What does an analogue signal look like?
Smooth curves and sometimes feature sharp peaks.
What does a digital signal look like?
Sharp edges and vertical drops.
What is DAC?
Digital to analogue conversion.
How do you convert from digital to analogue?
Using a digital to analogue converter (DAC).
What does a DAC do?
Reads a bit pattern representing an analogue signal and outputs n alternating, analogue, electrical current.
What is the most common use for a DAC?
Converting digital aidio signals into analogue signals.
