[LAD] twice as loud

lieven moors lievenmoors at gmail.com
Fri Jul 23 16:42:11 UTC 2010


On 07/23/2010 06:29 PM, fons at kokkinizita.net wrote:
> 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' ?
>
>   
If A would be very close to silence, yes.



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