Pleasurize Music Foundation, The most credible dynamic range advocacy group so far? Options

[Axon]

http://www.dynamicrange.de/

This looks pretty good. They have lots of industry contacts, Algorithmix is involved with a professional-looking dynamic range meter (it appears to be a variant of Chromatix's technique, actually), which is already released. They aren't focusing on visual waveform plots (yay) and are instead focusing on industry interaction.

[Raiden]

Where did you see the info referencing "3 seconds"? I couldn't find that sort of thing on their site.

Depending on how they're computing their RMS numbers, and especially depending on equal loudness weighting and/or BS.1770 filtering, a full scale sine could very easily go way above 0db. pfpf does the same thing. It doesn't mean the meter should go negative; that doesn't make any sense.

It's in the manual of the release version:
http://www.dynamicrange.de/sites/default/f...1_1-Deutsch.pdf
I'm referring to this paragraph:

Zur Ermittlung des offiziellen DR‐Wertes wird der Titel bzw.
das Image des Tonträgers (Wave, 16bit, 44,1 kHz) gescannt
und im Hintergrund ein Histogramm (Lautheitsverteilungs‐
Diagramm) mit einer Auflösung in 0,01 dB‐Schritten erzeugt.
Die nach etablierten Standards für die RMS‐Berechnung in
einem Zeitfenster von 3 Sekunden ermittelten
Lautheitswerte (dB/RMS) werden quasi in 10.000
unterschiedliche Schubladen aufgeteilt (der 0,01dB‐
Auflösung entsprechend). Von dem Ergebnis werden nun die
lautesten 20% als Berechnungsgrundlage für die
durchschnittliche Lautheit der lauten Passagen errechnet.
Gleichzeitig wird der höchste Peakwert ermittelt.
Der DR‐Wert ist die Differenz zwischen Peak und Top‐20 des
durchschnittlichen RMS.

So they calculate lots of RMS values over 3s windows, doing a histogram with a resolution of 0.01 dB, and finally they take the loudest 20% of those.
However I don't understand what exactly they mean by 20% as I get slightly different values when I program it.

This post has been edited by Raiden: Feb 23 2009, 00:43