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computing revision (compression (why we use it (download times are reduced…
computing revision
compression
lossy
permanently removes some data
can only be used on images and videos
can't be used on text files as it would remove repeated characters
lossless
finds repeated groups of data and stores them in a "dictionary"
can be used on text files
why we use it
download times are reduced
data allowances go further
voice is transmitted fast enough to keep up with image
speeds up transmission
better streaming
buffering
download speed is quicker than playback speed
sound
analogue to digital conversion
a sound card converts analogue sound waves to digital sound samples
ASCII
images