It was <2013-10-22 wto 11:40>, when Jussi Laako wrote: > On 22.10.2013 12:25, Łukasz Stelmach wrote: >> log(10) = 2.30258509299 (?) >> log(exp(1)) = 1 > > log10(10) == 1, decibels always use 10-base logarithm. Of course you > can also use natural logarithm, but then: > log10(x) == ln(x)/ln(10)
I always forget it and need to calculate it everytime again and again ;) > By the way, I recommend using excellent open source software like > Octave or Scilab. :) C-x * q is way quicker for even for logarithms ;) (if you know how to use them). Then there is python, I can recommend it for some non-trivial array processing. Octave, however a great tool, i would not recommend it for anything less than fft. >> Indeed it is -29.473, that is even less than I though. Why dBFS? There >> is no absolute Full-Scale in this case. Full-Scale might be the number >> of of packages available for the distribution rather than installed on >> your machine. > > Full scale is just 100%, IOW factor of 1. Of course you can have also > positive dBFS for values exceeding 100%. Decibels should never be used > without reference point, because it is always a relative value. The way I've been taught full-scale is something absolute. For example you've got audio signal with 16 bits per sample and you can't have anything louder than 0 dBFS. You can't have a sample above 65535. -- Łukasz Stelmach Samsung R&D Institute Poland Samsung Electronics
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