Rockbox mail archiveSubject: Re: crackle in mp3's regardless of bps?
Re: crackle in mp3's regardless of bps?
From: BlueChip <cs_bluechip_at_webtribe.net>
Date: Wed, 16 Feb 2005 20:38:25 +0000
> 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
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 2005-02-16