[sdiy] resultant Bass, was Brain filling in fundamental

[James Dunn]

Ingo Debus wrote:
>
> Am 18.07.2008 um 10:28 schrieb James Dunn:
>
>> However, I remember the sound I heard at a certain point was 
>> distinctly like ring modulation (sum and difference) and it sounded 
>> like they were not in the space, but in my head!
>>
>
> I experenced the same thing when I was playing a sequence of high 
> notes on the flute (hearing only an additional lower note, probably 
> the difference tone). My flute teacher told me that this is normal.
>
>
>> Is this an example of non-linear mixing in the ear?
>
> Obviously, what else could it be? Since only one note is played at a 
> time, I wonder if it's the currently played note mixing with the 
> acoustic echo of the previous one, or if the "mixing" is done in the 
> brain?
>
> Ingo
>
>
Well I was wondering how much of it was to do with the resonant 
frequencies of the space (and as Paul pointed out the overtones of the 
flute/sax) and whether it could be captured by a microphone, but perhaps 
this is too far off-topic..!

James