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holowoodman 2 days ago

Decibels are completely ridiculous. They are only useful if you are a cable monkey just adding and subtracting amplification/dampening factors. As soon as you need to do any kind of non-trivial conversion or computation, dB* is more of a hindrance to understanding and simplicity, because you will always need to look up in some strange table of dB weirdness. Integrate over a spectral power density in dB/Hz? You better convert that to real metric first... Need to solder in a capacitor/resistor/coil as a filter? Better convert to real metric first, because only some pre-made filters are specified in dB (and there are quite a few weird conventions, so you better convert to real metric and check first...).

lifthrasiir 2 days ago | parent | next [-]

I do see needs for something like decibels. It is a useful way to communicate an inherently logarithmic quantity. The real and IMHO only mistake is that it was described as a typical unit, while it should have been a unit constructor and specially treated in the SI unlike others. (Not in the SI, but the [milli]meter in mmHg etc. and `p` in pH---really p[H+] [1]---are other popular examples of unit constructor.)

[1] To be clear, I'm aware that pH and p[H+] are technically different. But that's orthogonal here.

MegaDeKay 2 days ago | parent | prev | next [-]

I'd say the engineers I knew building satellites at companies like SS/L and Boeing deserved a better title than than "cable monkeys".

mwbajor 13 hours ago | parent | prev [-]

They're just ratios....