Analogue sound is completely different to digital, it involves physical thing, it has unlimited bandwidth. it is vibrations and is arguably a higher quality sound than digital.
Formats are vinyl records and magnetic tape, the slower the tape moves and the thicker the size the higher the quality of sound.
Digital sound is stored as bytes of information on the media which are made into sounds by using a computer and exact copies can be made of the original, analogue sound is information stored as varying strength of magnetic fields or heights of the grooves which can be amplified.
"Audio and video have been analog since the beginning of radio and TV and the first magnetic recording. While the industry is almost entirely digital today, analog is still around in the form of AM/FM radio, audio cassettes and VHS tapes. The ability to capture the subtle nature of the real world is the advantage of analog techniques. It takes huge digital capacities and bandwidth to match the granularity of many analog systems."
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