Rockbox mail archiveSubject: Re: rockbox-recorder-20061122 - volume representation messed up
Re: rockbox-recorder-20061122 - volume representation messed up
From: mat holton <mat_at_lessermatters.co.uk>
Date: Tue, 28 Nov 2006 10:30:18 +0000
Philipp Pertermann wrote:
> Paul Louden schrieb:
>> In that context, 90% could actually be considered the same as
>> -10%, as they're both "10% less than the full level" but since you don't
>> have an absolute point of reference with dB, the negative numbers make
>> perfect sense.
> Actually you do have an absolute point of reference: a full scale
> swing of the signal. That's why it is called dbfs. But you are right
> that this doesn't mean an absolute volume level as perceived by humean
> ears. That is measured by db spl (sound pressure level), an other kind
> of decibel. That describes the sound pressure relative to a sound that
> produces a pressure change of 20uPa.
> What a pity that rockbox can not scale the volume in db spl. That's
> impossible because it depends on the headphone and probably even on
> how well the headphone fits into the ear.
Well, just add even more configurability. We can keep a database of
headphone\ear types\sizes and use this information to calculate the
Received on 2006-11-28