source file: m1544.txt Date: Sun, 04 Oct 1998 07:33:30 -0500 Subject: Re: beats me From: Gary Morrison > Thus (for example) a sine with frequency 100 Hz and another with > frequency 101 Hz when sounded together appear to be a single wave > at frequency 100.5 Hz with a beat rate (amplitude modulation) of 1 > Hz. This is the kind of beating that Bram is (I think) trying to cancel > by adding back in appropriately chosen waves. > I see no theoretical reason why Bram's suggestion shouldn't be do- > able. I probably didn't follow Bram's suggestion then. In the case of Bill's example, Bram, were you suggesting to add a wave at 100.5Hz whose amplitude is a constant minus the amplitude of the composite waveform? If so, then as Bill said, yes, it seems like that ought to work. It would seem pretty involved when you get into nonsinusoidal waveforms, though. I was thinking, apparently incorrectly, that (again using Bill's example) you expected to be able to remove the beating phenomenon by adding a 1Hz sinewave to the 100Hz & 101Hz composite wave. That didn't seem likely to work auditorially, and certainly doesn't mean anything in terms of the objective tones.