28 Feb
2007
28 Feb
'07
7:44 a.m.
Hi Paul and all (that rhymes :-),
2007/2/27, Paul Winkler <pw_lists(a)slinkp.com>om>:
On Tue, Feb 27, 2007 at 10:40:46PM +0100, Arnold
Krille wrote:
I stand corrected, my numbers where from my physics-book which states
that 120dB is the "Schmerzgrenze" and 0dB is the slightest whisper
human ear can hear. Problem is that these values vary on the frequency
so there is a correction curve standardised(?) in some A-something
paper so these corrected values for the human ear are called db(A)...
Otherwise these logarithmic power- and pressure-levels are bubbling my
mind and if I don't stop thinking about theme, I will get even more
screws loose in my head.
So, for the archives and the record and Paul, don't trust the words I
said, I don't really have a clue. At least not good enough to do an
argument.
Happy coding and musing(?),
Arnold
--
visit http://www.arnoldarts.de/
---
Wenn man mit Raubkopien Bands wie Brosis oder Britney Spears wirklich
verhindern könnte, würde ich mir noch heute einen Stapel Brenner und
einen Sack Rohlinge kaufen.
120dB is the difference between just loud enough
to be heard by your
ear (1dB) and the loudness when the bones in your ear bow to protect
it. At higher levels (>120dB) your ear aches but it will recover if
the noise isn't permanent. At least thats the definition I learned...
I got my
numbers from http://en.wikipedia.org/wiki/Decibel#Safety but
obviously their numbers represent some sort of typical examples; I
been in a number of discotheques (here in the US we can't pronounce
that so we just say "clubs") that had sound levels far above 100 dB.
The amount of time the ear can be exposed to a given sound pressure
level before sustaining permanent damange clearly varies a lot from
person to person. But government standards are probably a good
guideline to start with, eg. OSHA table G-16:
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&…