Rockbox.org home
release
dev builds
extras
themes manual
wiki
device status forums
mailing lists
IRC bugs
patches
dev guide



Rockbox mail archive

Subject: Re: Audible distortion/clipping
From: Joaquim Carvalho (jdc_at_x64.com)
Date: 2003-01-21


On Mon, 2003-01-20 at 23:07, Linus Nielsen Feltzing wrote:
> Björn Stenberg wrote:
> > Joaquim Carvalho wrote:
> >
> >>Full volume on the jukebox should be full volume. Exceeding the
> >>output limit of the DAC (16 bits -> +32767 to -32768 ) for putting
> >>a few more milliwatts into the headphones is not a good thing.
> >
> >
> > You mean every other consumer audio equipment you own is perfectly distortion free at max volume? Your discman, walkman, pocket FM radio?
> >
>
> Ooops. It just came to mind that we do "overdrive" the MAS decoder. The
> 100% volume setting in Rockbox is 12dB, and 90% is 0dB. Setting the
> volume above 90% may introduce digital distortion.
>
> We can solve this in several ways:
>
> 1) Don't allow a volume above 0dB
>
> 2) Give a warning when setting it above 0dB
>
> 3) Let 0dB be 100% and allow the user to set it up to 110% (or whatever)
>
> 4) Don't do anything
>
> 5) ???
>
> /Linus
>

IMHO a setup item to enable/disable setting output volume above maximum
distortion-free level. (disabled by default?)

P.S.
I would recommend people who want to play music at LOUD volumes to buy
some headphones with a good sensitivity but it's bad for your ears
anyway.



Page was last modified "Jan 10 2012" The Rockbox Crew
aaa