Re: Web Audio API DeciBel Full Scale

Hey Michele-  The answer I gave on StackOverflow (
http://stackoverflow.com/questions/22604500/web-audio-api-working-with-decibels)
is still appropriate; the nominative audio sample range in Web Audio is
[-1,+1], so the "max level" is 1.  The "sample level" is the level of the
audio - in order words, the actual value of the sample itself.

If you recorded a WAV file "at" -8dBfs, I presume you just mean that the
maximum value in the all the samples is at -8db of FS - aka +0.107 or so.
 Just playing it back should replicate those values.  If you wanted that
file to be at full scale, you'd need to connect it through a gain that
would amplify it to be 1 - i.e., with a gain.value around 9.3.  You don't
usually want to run that close to full scale, though - you want some
headroom in case you are adding effects, etc.


On Tue, Mar 25, 2014 at 2:58 AM, Michele Cipriani <cipriani.ceo@dropin.fm>wrote:

> Hello everyone,
> i am working on dropin.fm (a cloud digital audio workstation), and i am
> in doubt how decibel full scale works in Web Audio API.
>
> As i read on the Oreilly book about Web Audio Api
> http://chimera.labs.oreilly.com/books/1234000001552/ch03.html
>
> dBFS = 20 * log( [sample level] / [max level] )
>
> But what ’s max level and sample level in a Web Audio Api audio context?
>
> If i import as audio buffer a  wav recorder at -8dbfs, how can i get the
> same value in a web audio api app?
>
> Thanks a lot
> *Michele Cipriani*
>
> Dropin CEO
> www.dropin.fm
>
> eMail: cipriani.ceo@dropin.fm
> Phone: +39 3284551317
>
> Twitter: @ciprianimich
> LinkedIn: linkedin.com/in/ciprianimichele/<http://www.linkedin.com/in/ciprianimichele>
>
>
>    -
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