How did/do they make records I just don't understand it!?
by 
E is for Ellie
ANSWERS: 1
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Sound is recorded in digital format, which means a computer assigns a specific number to a particular sound. The next sound gets a different number. The following sound has yet a different number. All sounds have a unique number assigned to them and the recording is simply a list of those numbers in chronological order. To make a CD copy of that list of numbers, a laser burns a little spot on the surface of the CD. Then for the next sound in the list another little spot is burned by the laser. On the surface of the CD there is a continuous queue of those little spots and they are each at a different depth and of a different shape. Later, when a CD player is used to play the CD, a second laser shines on that string of little pits on the surface of the CD and it measures the depth and shape and feeds that measurement in to a computer program that reads the size of the burnt spot as an instruction to create a specific sound according to the dimensions of the little pit. An MP3 player simply takes the list of numbers mentioned in the first paragraph and directly translates them in to sound.
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