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Rockbox mail archiveSubject: RE: Optimum Audio LevelsRE: Optimum Audio Levels
From: Stuart Tedford <stuart.tedford_at_piresearch.co.uk>
Date: Wed, 2 Jun 2004 11:24:14 +0100 Do volume levels depend on the gain (or normalisation) of your mp3s too? I use mp3Gain http://mp3gain.sourceforge.net/ to normailise my entire collection to 89dB. So my levels are: 90% : In the Car (plugged into cassete adaptor of car stereo) 75-95% : headphones - depending on background noise levels. 85-90% : connected to home stereo equipment. Stu. -----Original Message----- From: BlueChip [mailto:cs_bluechip_at_webtribe.net] Sent: 02 June 2004 09:15 To: rockbox development Subject: Optimum Audio Levels Hey all, I need to do a little survey to optimise the new Audio Interface... One question :) ============================================ What is the VOLUME range you use most often? ============================================ ...If you use, say, one volume in the car, and another in bed at night. Feel free to give two answers. Personally I use: 85-95% in walkman mode 65-75% in bed 92% in the car Skip to the "P.S." section now! ...unless you want all the techies-only stuff. The volume scale inside the unit is measured in dB on the scale {MUTE, -114, -113, ..., -2, 1, 0, +1, +2, ..., +11, +12} Where 0dB is designed to produce "Line Level" These values are numbered {0x00, ..., 0x7F} respectively Such that {0=Mute, 1=-115dB, ..., 0x73=0dB, ..., 0x7F=+12dB} The Rockbox volume scale is a linear transpose of the MAS scale. That is: Actual_Volume = Rockbox_Volume*0x7F/100 ...which interestingly enough means there is no Rockbox setting for line level and you do not have fine control where required. I have a non-linear scaling algorithm which allows greater control in the most used volume ranges at the cost of less control in the unused volume ranges. At Rockbox=60%, you are down to 0x4C which is -39dB I currently have FULL control over -18..+12dB but I think others, particularly the audiophiles, may require accurate control at lower levels. B l u BlueChip C h i p PS. Good news: I just found the MAS registers to turn your Jukebox into a mixer and/or karaoke machine - so your jukebox can remove the old vocals and add your in place, live and with a simple mixer :) There's even an option for "3.0" sound if anyone is interested in even more volume - lol _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-06-02 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |