You can periodically take samples of air pressure, quantize them, and end up with enough information to reconstruct a sound wave accurately enough that a human ear can't tell the difference.

Since we also have computers hooked up to a global network, you can then send that information to the other side of the planet and *they* can reconstruct the sound wave too, just as accurately as you can. No attenuation, no extra noise, etc.

Neat.

#PCM #digitalAudio