On 12/25/2010 12:49 PM, fons(a)kokkinizita.net wrote:
On Fri, Dec 24, 2010 at 05:31:59PM +0100, Jörn
Nettingsmeier wrote:
in a presentation i heard recently, the presenter
played a metallica
single, in direct comparison to pink noise at full scale. the metallica
mix was significantly louder. go figure...
That's cheating. Pink (or any color) noise doesn't have a defined
peak/RMS ratio. If it's Gaussian its peak value is unlimited.
true. the fun thing was you could see his slide announcing the next demo
snippets. imagine reading this:
1. peak-normalized metallica single
2. pink noise at full scale
now when you frequently use your average run-of-the-mill pink noise
generator at -20dBFS to test speaker arrays, you do have a gut feeling
of how "loud" pink noise is. in fact, for reasonable time windows,
you're pretty likely to get an average loudness - with JAPA's pink noise
generator for instance, the loudness osciallates around a mean value
such that if your meter integrates for longer than, say, a second, the
reading will be pretty much constant.
so the second line was enough to make me cringe and grope for my ear
plugs. so it was quite a laugh when the perceived loudness was a lot
lower than for the first example.