|
Rockbox mail archiveSubject: Re: Optimum Audio Levels- 0dBRe: Optimum Audio Levels- 0dB
From: Stu Engelke <engineer_at_nycradio.com>
Date: Thu, 03 Jun 2004 09:44:17 -0400 Some definition of 0dB and +12 and _ 60 is necessary. dB by its definition is a relative scale. 0 is usually what we are referring everything else to. The last letter in dBv dBu dBm etc gives a clue. So if you use dBv 0dB is 1 volt coming out of the headphone jack. dBm would be around .7 V That is what is so nice about standards. There are so many to choose from. Stu At 03:22 AM 6/3/2004 +0100, you wrote: >Hi guys, > >First of all a great big thank you to everybody who replied. You help is >much appreciated :) > >I have read every single response and catalogued them; and will make some >analysis of the results and tweak the algorithm accordingly > >A few comments were made that I should reply to; I have combined them all >into this 'one big reply.' > >>I would REALLY like a setting that produces "line level" >> >>Don't wan' no stinkin' karry okie. > >"LINE OUT" is there :) > >The Empty-Orchestra option is gonna be cool - I'm already dreaming about >it (the interface, not the singing), but fear my time may be about to be >torn away from such severe Rockbox development - so it may be a while. > >>Headphones: 60 - 70 % > >Either you have incredible headphones or I am going deaf - lol > >>If you do line level what are you going to define "line" as? >>-10 is about normal for consumer stuff >>+ 4 is line for pro stuff. >>Thats dBu > >and > >>As someone who has tried to use an Archos in professional applications, I >>would strongly suggest -10dBu. It's consumer grade, at best. > >scope tests: ># Chris Muth reports 90% is the closest match to the line level from his >car CD player ># I recall a more detailed test (but cannot find the email now) where the >result was 93% >...The manual claims that 0dB (on it's scale) will produce line-out >...this is "about" 92% > >So as there have been _two_ tests which I know of, and the average of the >two is almost exactly what the MAS Engineers claim - I am going to reap >the experience of the chip designers and the two Rockboxers who got out >their scopes and call 0dB (on the MAS3587 "VOLUME" scale) LINE-OUT > >Hope that satisfies all the points which were raised. If not ...ask more ;) > >Cheers again for all your time people, > >BlueChip > >_______________________________________________ >http://cool.haxx.se/mailman/listinfo/rockbox > > > > >-- >Incoming mail is certified Virus Free. >Checked by AVG Anti-Virus (http://www.grisoft.com). >Version: 7.0.245 / Virus Database: 263.0.0 - Release Date: 6/2/2004 Stuart Engelke WMCA WWDJ NY 201-298-2108 _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-06-03 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |