Physics may help for hearing minor second harmonically?

[Remcoremcoremco]

Hi,

I just thought. In a minor second harmonic, the two frequencies are very close, only about 6% from eachother. If you play for instance 300 Herz and a half tone higher, 318 Herz, your ear will probably hear the average, so 309 Herz, fading and getting stronger in a 9 Herz frequency (amplitude getting stronger and weaker in 9 Herz).

sin(a)+sin(b)=2*sin((a+b)/2)*cos((a-b)/2)

Guess this will be better hearable at low frequencies...

By the way, anyone know what frequency is the middle C? And which key is 440Hz?

[Quentin]

C4 is 261.63hz according to this chart:
http://www.phy.mtu.edu/~suits/notefreqs.html
(they place middle C at C4, some do at C3)

440hz is A4.