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Subject: Re: Audible distortion/clipping
From: Linus Nielsen Feltzing (linus_at_haxx.se)
Date: 2003-01-21


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



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