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Subject: Re: Sound quality with Rockbox

Re: Sound quality with Rockbox

From: George Styles <>
Date: Mon, 9 Dec 2002 11:16:40 -0000

I see. thanks


----- Original Message -----
From: "Linus Nielsen Feltzing" <>
To: <>
Sent: Monday, December 09, 2002 10:29 AM
Subject: Re: Sound quality with Rockbox

> George Styles wrote:
> > i also have the subjective idea that the Archos sounds slightly better,
> > I have not experimented with the various settings etc. it may be
> > as simple as the default loudness setting...
> I think so too. There is little we can do about it. Still, I can add
> some new interesting settings for the Super Bass that are hard coded at
> the moment. For all tweakers out there.
> > what do u mean by digital distortion? do you mean a buffer overload, or
> > you scaling the MP3 data somehow so its clipping?
> We don't do anything to the MP3 data, we just pass it to the MAS DSP.
> The MAS DSP processes the audio according to our settings (Bass, Treble,
> Loudness, Volume) without any compensation for overflow in the
> This means that we must make sure that the sum of the settings do not
> exceed 0dB. If we set Bass/Treble to 6dB, we must set the volume to -6dB
> to prevent overflow. We do not do that today, mostly because of
> lazyness, but also because we want to allow people to use the settings
> they want. You *can* set Bass to +12dB and still get no clipping, either
> because the volume is low enough, or that the mp3 audio has a generally
> low level so clipping does not occur.
> If we add a compensation algorithm, people will not be able to listen to
> low level audio.
> I still intend to add compensation, but only as an option for those who
> need to set the bass/treble/loudness high and don't want to adjust the
> volume themselves.
> /Linus
Received on 2002-12-09

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