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sound and compression (data reperesentation (stored sound recreated using…
sound and compression
data reperesentation
stored sound recreated using digital to analogue converter (DAC)
converts binary numbers back into a changing voltage
voltage makes speakers vibrate to reproduce sound
sound waves converted into voltage charges
voltage sampled at intervals = sample rate
values converted into binary
collection of binary numbers stored as sound files
number of samples taken per second (measured in Hertz)
higher sample rate :arrow_right:
better sound quality
larger file size
bit rate is the number of bits used to store each sound sample
higher bit rate
better quality
larger file size
compression
lossy compression
data removed to reduce file size
data cant be put back
generally used for JPEG MP3 and MPEG files
lossless
dictionart encoding
compression algorithm generates index of data items
sounds are monolouge