How does a recording reproduce our voices?

Question

I understand that data cd record data by the presence of pits (on/off signals) in a cd/dvd. I don't understand how these pits (on/off signals) actually capture our voices?

Answer 1

Thats a brain teaser, i can't figure it out, either???

Answer 2

Sound waves, which are changes in air pressure, can be picked up by a microphone and changed to an electrical signal.  This will be a voltage that goes positive when the air pressure is higher, and negative when it is lower.  This will be a complicated analog waveform, but it can be converted to numbers like you would measure the height of a graph at various points and write the numbers down as a chart.  The conversions have to be done several thousand times a second for a good recording.  Then the numbers are coded on the CD as binary numbers, with each bit of each number producing a pit or not, depending on whether that bit is a one or a zero.  When it is played, the laser in the CD player reads the pits and converts each group of bits into a voltage level, and sends it to the speaker, which moves the air back and forth the same as the original sound.