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The A-Zed of Audio

Gold is one of the most durable value keepers in the world. Yet long ago, sneaky folks realized that gold could be mixed with less valuable metals to dilute its purity and create something that may have appeared similar, but wasn't the same. In some movie you've probably seen a pirate or some market vendor bite a gold coin to figure out its purity –that's because pure gold is relatively soft, and a bite could [roughly] indicate its purity.

Overtone

The A-Zed of Audio

One of the wildest experiences I ever had was eating in the dark. And when I say dark, I mean dark. The restaurant is called O.Noir, and I guess you could call it a concept restaurant; not only do they feed you, but they give you the experience of a blind person – after ordering your food in a dimly lit bar area, you're guided into a completely lightless room and seated at your table by one of the restaurant's blind waiters. After struggling for minutes to see anything, you eventually give up. You're in darkness so deep that having your eyes open or closed makes absolutely no difference.

Nyquist-Shannon Sampling Theorem

The A-Zed of Audio

Every day we deal with the problem of squeezing more of our world into smaller containers. How many books can you fit on your shelf? How many hours of sleep can you fit into your busy schedule? How many clothes can you cram into your suitcase as you pack for a trip? As time goes by, we gradually become crazier with this, always trying to squeeze a little more into a little less: we squeeze the books a bit closer, fold the shirts a bit tighter...you get the idea.

Equalizer

The A-Zed of Audio

Volume knobs are hardly a mystery to us music-listening folk, though with our music players becoming more and more digital, the presence of a real knob is coming to be a rare thing. Still, even young children have a firm grasp over making something louder or quieter, and when we do this, if we think about what we're doing we're either strange, or into sound (which might be two words for the same thing). 

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