Chapter 1 - Digital Data Flashcards
What is data ?
Raw facts and figures with no meaning
What is information ?
Data with meaning
How do computers store data ?
In binary format
Name each storage capacity and what it’s made up of
kilobyte = 1024 bytes megabyte = 1024 kilobytes gigabyte = 1024 megabytes terabyte = 1024 gigabytes
Name 3 data types
Numeric , Date/Time and character/string
What is the smallest element of an image that can be edited ?
a pixel (picture element)
What is a bitmap graphic ?
Store details about every individual pixel that makes up an image
What is a vector graphic ?
Stores components of the image as mathematical equations.
What is streaming ?
Process that allows video to be viewed straight away without having to wait for the full video to be downloaded
What is a buffer ?
Computer memory used to store a part of the video before it is watched
What does buffering help to do ?
Helps to prevent possible disruptions if there are time delays in streaming while the video is playing
What is the sample rate ?
number of audio sound samples captured per second
What is bit depth ?
The number of bits used for each sound sample
What is bit rate ?
The quantity of data measured in bits that is processed in a given amount of time
How is a sound sample converted from analogue to digital ?
- An ADC will will sample the signal at regular intervals
- samples are the converted to digital format
- frequency measured in hertz
