Uses of sine (sound) waves.

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Deezel

^How do I change ths name
This is kind of a random question, but it's very important and I'm stuck.

Any of you guys know of any applications of sine waves in real life other than music? I don't mean like anything calculus related or anything related to algorithms or circuits. For example: censor beeps are sin waves, heart rate monitor beeps are sine waves, timer beeps are sine waves (I think), but those are the kind of answers I'm looking for.

Edit: Triangle waves or square waves are also acceptable.
 
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most of those bleeps you mention are actually triangle or square wave or pulse width waves

as for real life uses not much that I can think of beyond analysis
 
Sonar maybe? Though I don't know for sure if they use pure sine waves for that.

And maybe for the very first video games like 'tennis for two'. I can imagine those first applications would use the simplest sounds as a proof of concept.
 
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pong/tennis for two is a square wave

sonar tends to be a pulse wave (it is easier to synthesise in hardware than a sine wave is - it is essentially a flip flop with asymmetrical timing) as well
 
I'm loving all of these answers. I really like the sonar idea though, I just have to figure out how to make a pulse wave.
 
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