[sdiy] Brain filling in fundamental

[Florian E. Teply]

Aaron Lanterman schrieb:
> 
> On Jul 16, 2008, at 2:38 PM, John Mahoney wrote:
> 
>> "When you need to seriously pump up your lows, choose MaxxBass, the 
>> bass enhancement technology used on more hit records and major motion 
>> pictures than any other. MaxxBass uses psycho-acoustics to calculate 
>> precise harmonics that are related to the fundamental tones of sound. 
>> When these harmonics are combined, it creates the effect of lower, 
>> deeper frequencies. For bass you can really feel, it’s got to be 
>> MaxxBass."
> 
> I think some pipe organ manufacturers have used that trick?
> 
To my knowledge: Yes.
As far as i know, they designed the organ in a way that on the deep low 
register (16' or even 32') the fundamental is left out, but the human 
brain-ear-combination reconstructs the fundamental from the harmonics. 
I've experienced that myself with a couple of friends: we were doing a 
test based on exactly that. Simply holding three tones that would be the 
  first three harmonics of a tone not voiced. If held steady, one could 
hear that left-out tone, even though it wasn't there physically.

Greetings,
Florian