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DanielLC comments on Thinking Bayesianically, with Lojban - Less Wrong
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The power of sound goes up with the square of the amplitude, so if something has a 10 decibel increase in amplitude, it has a 20 decibel increase in power. As such, I can see how someone might get it mixed up.
A decibel is defined as 10log10(x/y), where y is whatever you're comparing it to. It should never mean 20log10(x/y).
Well thanks for clearing that up. I would have loved to have that explained when we were all trying to figure out who decided that 20 was a good idea.
Do you know with sound what the baseline 0 db is?
It's supposed to be on the edge of human hearing. It's also a round number. I don't remember beyond that.
measured in what? Power density or something?
It's 20 µPa RMS, so measured in pressure.
neat, thanks!