Unit And Data Representation Flashcards
What are analogue signals
Pieces of continually changing data
What is sampling
Analogue signals need to be stored and converted into digital data so the computer can read and store sound files.
What is sample size
Number of bits per sample
Sample frequency
Number of samples taken per second (measured in KHz)
Bit rate
Number of bits per second of audio
What does increasing the sample size do
Increases the quality and file size
What is the formula for file size
File size = sample rate x bit depth x duration
What would 00101001 shifted 3 places to the left be
01001000 as the 001 has overflowed
What is a bit
1 or 0
What is a nibble
4 bits
What is a byte
8 bits
What is a kilobyte
1,000 bytes
What is a megabyte
1,000 kilobytes or 1,000,000 bytes
What is a gigabyte
1,000 mb or 1 billion bytes
What is a Terabyte
1,000 GB
What is a petabyte
1,000 TB
What is D4 in hexadecimal
17
Why is binary used
Data is stored and processed using combinations of on (1) and off (0) as computers use switches
Why use hexadecimal
Easier for humans to read than reading binary numbers
What is a character set
Set of characters that are each given a unique binary number
How many bits is ASCII
7-bits so there’s 128 combinations
How many bits are in extended ASCII
8-bits so there’s 256 combinations
What is ASCII
A character set which represents all English letters, numbers and symbols
What is Unicode
A character set which represents additional languages and emojis
