Topic 2 - Data Representation Flashcards
(28 cards)
What is 7-bit ASCII
Each character is represented by a number
7-bits gives you a maximum of 128 character combinations
What is Amplitude?
Sound amplitude is experienced as the loudness of sound with sound waves, this is the extent to which air particles are displaced
What is Analogue sound?
Audio in a format of continuous vibrations or waves
What is Binary?
A base 2 number system, which is represented in 1’s and 0’s
What is Binary pattern?
A sequence of 1s and 0s
What is Binary shift?
Moving the bit pattern in a register left or right a given number of positions
What is a Bit?
A binary digit (the smallest unit)
What is Bit depth?
The number of bits used to store each sample
What is Bitmap graphic?
An image format where the picture is made up of individual pixels
What is a Byte?
8 bits
What is Colour depth?
The number of bits used to store a single pixel
What is Data compression?
Reducing the size of a file
What is Denary (base 10)?
A numerical system of notation which uses 10 as its base
What is a Gibibyte?
Gibi: 1 gibibyte is 1024 mebibytes
What is Hexadecimal (base 16)?
A numerical system of notation which uses 16 rather than 10 as its base
The 16 Hex base digits are 0-9 and the letters A-F
What is a Kibibyte?
1 kibibyte is 1024 bytes
What is Lossless compression?
Partial reduction in file size but none of the data is lost, the original file can be recreated from the compressed data
What is Lossy compression?
Greatly reduces file size but some data is lost
What is a Mebibyte?
1024 kibibytes
What is a Nibble?
4 bits
What is Overflow?
When there are insufficient bits to store a number after a calculation due to a final carry bit
What is a Pixel?
A single dot of colour in a bitmap image or on a computer screen
What is Resolution?
The number of pixels contained on a display monitor
What is Sample interval?
The amount of time that passes between capturing each sample
