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Subject: Re: crackle in mp3's regardless of bps?

Re: crackle in mp3's regardless of bps?

From: BlueChip <>
Date: Thu, 17 Feb 2005 04:17:37 +0000

As Rockbox does not accept 'anonymous' submissions, you will need to get it
from the build there is quite an
old v2.2 build iirc, but the source and step-by-step instructions are there
if you wish to compile it into a more recent build - shouldn't be
necessary for these tests.


At 21:10 16/02/2005, you wrote:
>Bluechip- I will try that. Is that in the daily build?
>-----Original Message-----
>From: BlueChip <>
>Sent: Feb 16, 2005 2:38 PM
>To: Gary <>, Rockbox development <>
>Subject: Re: crackle in mp3's regardless of bps?
> > Hello
> >
> > Is there anyone else that has a problem with high end sound breakdown
> > on some MP3's? I get a small amount of distortion on some MP3's that
> > sound simial to a pre-amp being turned up to high. It seems to be pretty
> > random, and doesnt seem to be confined to any low or high bit
> > rate. Might there be something wrong with my V2, or is it just a
> > characteristic of mp3's that my ears have just come to hear?
> >
> >Let me know
> >
> >Gary
>Could well be the mp3's ...but if your settings are tweaked out-of-spec
>(which is allowed by Rockbox (which is a good thing)) then you may be
>introducing digital distortion.
>Flatten everything (treble/bass/etc); disable MDB; and set the volume to
>0db (iirc this is about 92 under Rockbox - it is "0db" or exactly "88" with
>the audio3587 extension)
>This is the maximum you are allowed before introducing digital distortion -
>if you then increase the treble by 1db, you must reduce the volume 1db
>...if you decrease *ALL* settings by 1db, then you may increase the volume
>by 1db ...Audio3587 makes this simple, and flashes the icons when you are
>at risk of digital clipping - so whether or not you want to use Audio3587
>permanently is up to you, but it would certainly be a good test-bed for
>this type of complaint.

Received on 2005-02-17

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