1.2 text, sound and images Flashcards
how does a computer represent text
text converted to binary to be processed by computer
unicode vs ASCII
- unicode allow greater range of characters and symbols
- unicode require more bits per character
how does computer represent sound
sound wave sampled (convert analogue wave into digital signal). processed by computer
what is sample rate and resolution in sound file, what effect does increase have
sample rate: number of samples taken a second
sample resolution: number of bits per sample
increase file size and accuracy of recording
what is an image
series of pixels that are converted to binary, which is processed by a computer
what is resolution and colour depth in image, how does increase affect
resolution: number of pixels in image
colour depth: number of bits used to represent each colour
file size and image quality increase
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