Re: loudness and dB (Twice as loud?)

[In TD 197.10 I mistakely wrote:]
>Twice as loud is just twice as many dB (approximately).

Thanks to Fred Reinagel [TD 201.3] and John A. deLaubenfels [TD 201.5] I
now stand corrected.

A web search on "perceptual loudness" found
http://ee.mokwon.ac.kr/~jspark/rtp/speech/node57.html
http://claymore.engineer.gvsu.edu/~jackh/eod/mechanic/sound/sound.5.html

They both suggest that an increase of around 9 or 10dB is a perceptual
doubling of loudness (for medium loudnesses and medium frequencies).

Thanks guys.

-- Dave Keenan
http://dkeenan.com

[Dave Keenan, TD 202.16]
>
> They [the webpages cited] both suggest that an increase of around
> 9 or 10dB is a perceptual doubling of loudness (for medium
> loudnesses and medium frequencies).

I've refrained from giving any input to this discussion because
it appeared that what I thought I knew about dB measurement
was incorrect. Now I'm really confused, as it seems I had
been right all along.

It was always my understanding that an increase of 10dB,
by definition, was a perceptual doubling of loudness,
similar to the way that an increase of one unit on the
Richter scale is a doubling of perceptual strength of
an earthquake.

????

Joseph L. Monzo monz@juno.com
http://www.ixpres.com/interval/monzo/homepage.html
|"...I had broken thru the lattice barrier..."|
| - Erv Wilson |
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Joe Monzo wrote,

>It was always my understanding that an increase of 10dB,
>by definition, was a perceptual doubling of loudness,
>similar to the way that an increase of one unit on the
>Richter scale is a doubling of perceptual strength of
>an earthquake.

No, sir, not by definition, though perhaps approximately by design. The
fellas on this list have been right in their description of how dB are
defined.