[LAD] twice as loud

[fons at kokkinizita.net]

On Fri, Jul 23, 2010 at 01:28:37PM +0200, lieven moors wrote:

> I don't think this is easy. Imagine a ruler lying on your desk, and
> try to imagine the point where the ruler would become twice as
> long. I think you will find that your brain is continually adjusting
> that distance, and that it requires significant effort.

True, but it will be somewhere between say 1.8 and 2.2.
Not 1.5, not 3. The problem here is just one of precision.  
For sound this is quite different. Except by imagining or
remembering '2 of the same' there seems no way to even just
define what 'twice as loud' is supposed to mean. 

> This is how it could work for example:
> ...
> Now, if we would halve the range again, we would be unable
> to distinguish x from that point, and we have some kind of
> measuring
> stick:                                                          |  
>          | |  |      |

Transporting this to the audio domain, given two similar
sounds A and B with a B having a higher level than A, you
could adjust a third one X so it appears to be 'halfway'
between A and B. If you do this with A much smaller than
B, would you expect X to be close to 'half a loud as B' ?

Ciao,

-- 
FA

There are three of them, and Alleline.