Hi Ric, It is easier to hear beats at coincident partials but resultant tones don't care a bit about such niceties. Maybe what is being heard is a difference tone or resultant tone between 873 and 440? 873-440 = 473 This is then creates a further resultant 440-473 = 73 There is certainly "lots" going on in the sample. I wish I had a real time anaylzer. At 07:38 PM 1/11/2006 +0100, you wrote: > Hi Susan and others. >Listen to the following wave file which is comprised of 2 sine waves of equal > strength. Frequencies of 873 and 440 Hz. >http://www.pianostemmer.no/music/FTHREE.wav >Now these are sine waves with no overtones per se... yet there are at least >2 easily discernible beat rates. This should be proof enough that beat >relevant beat rates can occur in the absence of coincident partials. Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. Non calor sed umor est qui nobis incommodat mailto:pianotuna@yahoo.com http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK, S4S 5G7 306-539-0716 or 1-888-29t-uner
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