Software questions MiniMens

[Robin Hufford]

Hello William,
     I don't know where I came up with 3 plus 3 plus 3 then plus 1.5 is
required to get 10.  A mystery to me, except that the post was done in a
hurry.
     So what are you saying?  Benande takes the position as does Bernhard
that 6db is a doubling of loudness.  Perhaps this is corrected for
perception.   What is it?
Regards, Robin Hufford

"William R. Brohinsky" wrote:

> 3dB is a factor of 2 for power. (note power is expressed in watts,
> joules or some such, and as such cannot be negative. The components of
> power, for instance, in electronics, voltage and current, are a
> different unit, and in fact 6dB is a doubling of voltage.)
>
> It is nice to remember in here that dB is a ratio only, and 'absolute'
> dB values have an implied reference. Good usage states the reference, so
> dBm is 'referenced to 1mw (one milliwatt, 1/1000 Watt), and dbV is
> referenced to 1volt. Sound pressure levels have their references, and
> weightings (different curves which are applied to 'correct' readings to
> match the sensitivity of things like ears).
>
> By the way, while most of the quoted numbers are right for sound power
> (a less vague term than 'loudness'), the total of 3+3+3+1.5=10.5, and
> that is an increase by a factor of  11.22; dB is log-base-10, so  a
> magnitude (factor of 10) is 10dB.
>
> A handy reference(?):
> 1dB = x1.25
> 2dB = x1.58
> 3dB = x2
> 4dB = x2.51
> 5dB = x3.16
> 6dB = x3.98
> 7dB = x5
> 8dB = x6.3
> 9dB = x7.94
> 10dB =x10
> 11dB=12.5 (note, this is 1dB x 10, or 1dB +10dB: adding dB multiplies
> the factors like adding exponents!)
> 20dB=x100
> 30dB=x1000
> (ie, decades of dB are powers of 10. Thus, 30dBm is 1dBW, because 1mw x
> 1000 = 1 W)
>
> The useful ones to remember are
> 1dB = x 1-1/4
> 3dB = x 2
> 5dB = x 3
> 7dB = x 5
> 10dB = x10
> Y0dB = 10^Y
>
> and, if you're familiar with logarithms, you probably have divined (or
> remember) that
> dB=10(log(factor))
> and
> factor=(invlog(dB)/10)
>
> With calculators (and all the OS's in use have scientific calculators
> built-in) it's not hard to deal with dB.
>
> raybro
>
> Robin Hufford wrote:
>
> >Actually, I believe 3 Db is about a doubling of  "loudness".  3 is a
> >doubling plus 3 more makes a quadrupling plus 3 more makes eightfold at
> >9 Db.  Then 1.5 Db makes approximately tenfold or an order of magnitude.
> >
> >Regards, Robin Hufford
> >
> >Bernhard Stopper wrote:
> >
> >
> >
> >>   Part 1.1    Type: Plain Text (text/plain)
> >>           Encoding: quoted-printable
> >>
> >>
> >
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