[LAD] twice as loud

[lieven moors]

On 07/23/2010 10:23 PM, fons at kokkinizita.net wrote:
> On Fri, Jul 23, 2010 at 06:42:11PM +0200, lieven moors wrote:
>
>   
>> On 07/23/2010 06:29 PM, fons at kokkinizita.net wrote:
>>
>>     
>>> 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' ?
>>>
>>>   
>>>       
>> If A would be very close to silence, yes.
>>     
> I'd be *very* surprised if that would turn out to be true.
>
> I bet that if B is A + 40 dB, X would turn out to be
> close to A + 20 dB. And if B is A + 60 dB, X will be
> close to A + 30 dB. In both cases A is very small 
> conpared to B (at most 1/10000 in power).
>
> Ciao,
>
>   
Let's put it differently. If you only had sound B, and you
were asked to position a similar sound X halfway between
total silence, and the level of sound B, wouldn't that be the
same as asking that sound X has half the loudness of sound
B, or as asking that sound B has double the loudness of
sound X?

Greetings,

Lieven