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data representation
Descripción
Cambridge Computer Studies Mapa Mental sobre data representation, creado por Daniel Taylor el 14/06/2018.
Sin etiquetas
computer studies
cambridge
Mapa Mental por
Daniel Taylor
, actualizado hace más de 1 año
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Creado por
Daniel Taylor
hace alrededor de 6 años
19
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Resumen del Recurso
data representation
binary
a series of 1s and 0s which each represent a number
1 is on and 0 is off
computers read everything in binary
binary addition
0+0=0
1+1=0 but carry a 1 to the next column
1+0 or 0+1=1 with no carried numbers
Binary to denary conversion
every denary number has a binary equivalent
denary
everyday numbers from 1 - 9
hexadecimal
normal numbers up to 9 then 10 to 15 are A, B, C, D, E, and F represent the numbers
e.g. FF = 255, 11 = 17, 5B = 91 and E8 = 232
easy to convert to and from binary
a 16 base system
images
pixel: smallest addressable area
every pixel has the same amount of memory attached to it, if it is 2 bits it can store 4 colours
8 bits = 256 colours
resolution = number of pixels across by number of pixels down
sound
sampling rate: how frequently the sounds are sampled
original sound is analogue but computers use digital
bitrate: number of bits that can be put through the system in a second, measured in kilobytes per second
bits per sample x samples per second x number of channels
midi
compression
lossless compression
lossless compression leaves out repeated data and instead makes a note of how many times it is repeated
lossy compression
lossy removes data to make it smaller but this cant be restored and the image may not have the same quality as before
Recursos multimedia adjuntos
Binary Converter (binary/octet-stream)
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