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Rockbox mail archiveSubject: Re: Rockbox sound qualityRe: Rockbox sound quality
From: Antony Stone <Antony.Stone_at_rockbox.open.source.it>
Date: Thu, 11 Sep 2008 21:12:41 +0100 On Thursday 11 September 2008 20:43, Douglas Anthony Cooper wrote: > Another interesting point: I get *superb* sound quality via the > headphone jack of the iPod 5G when I boot into Rockbox. The iPod's > native OS sounds considerably worse: less clarity; narrow soundstage, > etc. An article I just read Where, please? > suggested this shouldn't be the case: > graphed outputs from both systems are identical. What are the "graphs"? If you mean analogue sound waveform output, then identical means identical. If you mean spectrum-analyser-type frequency vs. amplitude charts (sometimes likened to graphic equaliser settings) then this can mean anything, really. > So what's going on here? These are mostly AAC files at 160 kbps, and MP3's > at approx. 192 (VBR). I'm pretty sure it's not the placebo effect -- the > difference is pretty obvious. There's no reason why two different codecs (in this case, the "dec" part) can't produce noticeably different results from the same input (I assume you *are* playing the exact same files when comparing the two systems, yes?) Remember that lossy encoding such as MP3 is designed to reproduce what the human ear/brain combination hears, not to reproduce the exact same waveform. I'm not familiar with the original firmware on the iPod 5G - can you play a lossless (eg: WAV) file and see (hear?) if you notice any difference between the two, thereby identifying whether it's the codec algorithm which is causing the distinction? Antony. -- "The future is already here. It's just not evenly distributed yet." - William Gibson Please reply to the list; please don't CC me. ------------------------------------------------------------------- List admin: http://cool.haxx.se/cgi-bin/mailman/listinfo/rockbox FAQ: http://www.rockbox.org/twiki/bin/view/Main/GeneralFAQ Etiquette: http://www.rockbox.org/mail/etiquette.htmlReceived on 2008-09-11 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |