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Rockbox mail archiveSubject: Re: mp3 featuresRe: mp3 features
From: David McIntyre <plugh_at_mudbarn.com>
Date: Wed, 10 Sep 2003 17:14:48 -0700 http://www.micronas.com/products/documentation/consumer/mas3587f/downloads/mas3587f_2pd.pdf Shows that the automatic volume adjustment feature is built into the MAS chip. Why bother re-writing it? On Wed, Sep 10, 2003 at 05:40:18PM -0500, LoveLearn wrote: > The current automatic volume alteration discussion raised questions. > MusicMatch JukeBox includes a volume leveling option. Select which mp3 > files to process. Processed files are replaced by slightly larger > volume leveled copies. On MusicMatch playback formerly frustratingly > quiet files seem normally loud. Is this processing equivelant or > identical to the volume leveling proposed RockBox? > MusicMatch volume leveling processing appears CPU intensive on PCs. > Similar processing might be very slow on Archos hardware. > > I ran Peavey CS800 professional sound reinforcement amplifiers years ago > which included a quick acting volume peak limiting option. When driving > one of these 800 watt units to very high levels, audience members never > heard these spike reductions nor did they hear the recovery period > because it was so fast acting in both directions. When playing really > loudly, switching off this spike limiting circuitry instantly revealed > clearly recognizable clipping distortion while reducing apparent average > sound pressure level. After we discovered those two perceived > performance enhancements, we always left the spike reduction circuit > switched on. > > I've played with RockBox "Auto Volume" spike limiting. I don't use it > because its shortest recovery time is distressingly long and obvious to > me. I've experienced volume spike limiting that functions so fast > audience members can't perceive it's occurring. Would it be possible to > duplicate that circuit's effects with RockBox software? -- David McIntyre plugh_at_mudbarn.com http://www.mudbarn.com PGP Key fingerprint = CAB5 A73A 43FA 19E3 449D 20B8 25D7 FA84 8847 D6A7 http://www.mudbarn.com/~plugh/plughinfo.txt for geek code, pgp key, etc.Received on 2003-09-11 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |