[sdiy] resultant Bass, was Brain filling in fundamental

[dragon.servicing]

Hi,
just to confirm that some  Pipe Organ manufacturers do use a combination 
of higher tones to produce some of the pedal Bass notes. this is because 
the larger pipes can work out expensive in terms of lead / tin used.
for those interested there is more info at
http://www.organstops.org/r/Resultant.html

regards Peter



Florian E. Teply wrote:
> Aaron Lanterman schrieb:
>>
>> On Jul 16, 2008, at 2:38 PM, John Mahoney wrote:
>>
  snip
>> 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