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data representation, sound, image, image, image, image, image - Coggle…
data representation
how to convert from binary to denary
the make a table with place holders at the top and bits at the bottom
using the binary placeholder which starts at 1 and doubles each time. remember to write from right to left
start from right to left.
denary
humans use denary because it allows us to use ten values
the main reason the binary number system is used in computing is that it is simple. Computers don't understand language or numbers in the same way that we do
Denary is known as base 10 because there are ten choices of digits between 0 and 9 and A-F
binary
What is binary? Binary is a base 2 number systems made up of only 0 and 1
Logic addition: to add two binary numbers together, we use the following rules..
1+0=1 1+1=0 carry 1 1+1+1=1 carry 1
The CPU has lots of different switches it can be either on or off
hexadecimal
a hex digit can be any of the following 16 digits: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.
we use hex because its shorter and easier to remember, hexadecimal takes up less space
hexadecimal is a base 16 number system
images
colour depth: bit depth is the number of bits used to represent the colour of a single pixel
bitmap: an image file format where the picture is represented as a set of dots or pixels
pixel: the smallest element of an image. pixels are the dos that make the image on screen
how is sound stored? we can record sound using a microphone.
Sound quality is typically an assessment of the accuracy, fidelity, or intelligibility of audio output from an electronic device. Quality can be measured objectively, such as when tools are used to gauge the accuracy with which the device reproduces an original sound; or it can be measured subjectively, such as when human listeners respond to the sound or gauge its perceived similarity to another sound.
how is sound converted? sound is converted by samples of amplitude of the wave taken at regular intervals (sampling)
sound
