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Re: harmonic vs. inharmonic sounds (one last time)

Dear Kevin,

Your latest posting to the list contains the first of my private 
messages on difference tones, but not the second message which was a 
correction of the first one. Anyhow -- here is what I personally 

If I play on a synthesizer simultaneously two sine-tones of 
frequencies f_1 and f_2, softly at first and then with continually 
increasing volume, I hear difference tones if the ratio f_2 / f_1 is 
in the range from about 1.2 to 1.4.

For example, for f_1 = 400 Hz and f_2 = 500 Hz, I hear, at very low 
volume, no difference tone. Then, at slightly higher volume, I hear a 
cubic difference tone, f = 2f_1 - f_2 = 300 Hz. At still higher 
volume, I hear a first-order difference tone, f = f_2 - f_1 = 100 

See, e.g., R. Plomp, "Detectability Threshold for Combination 
Tones", JASA 37 (1965) 1110-1123.


Reinhart Frosch,
Dr. phil. nat.,
r. PSI and ETH Zurich,
Sommerhaldenstr. 5B,
CH-5200 Brugg.
Phone: 0041 56 441 77 72.
Mobile: 0041 79 754 30 32.
E-mail: reinifrosch@xxxxxxxxxx .

----UrsprÃngliche Nachricht----
Von: kevin.austin@xxxxxxxxxxxx
Datum: 16.03.2007 11:55
An: <AUDITORY@xxxxxxxxxxxxxxx>
Betreff: Re: harmonic vs. inharmonic sounds (one last time)


I think my question is ... Do "you" perceive and/or hear, rather 
the third person neutral. Perhaps this is why I'm a composer and 
a scientist, I'm more interested in "you" then 'the' "them".