"Ron Baker, Pluralitas!" <this@aint.me> wrote in message
news:468ff303$0$24708$4c368faf@roadrunner.com...
>
> "Bob Myers" <nospamplease@address.invalid> wrote in message
> news:f6oqdv$npt$1@usenet01.boi.hp.com...
>>
>> "Ron Baker, Pluralitas!" <this@aint.me> wrote in message
>> news:468fe7df$0$16560$4c368faf@roadrunner.com...
>>
>> First of all, do you think you could possibly learn to trim your posts?

Apparently, no, you can't. Too lazy to take the trouble to
perform this common courtesy, or what?

>> An audible beat tone is produced by the constructive and destructive
>> interference between two sound waves in air. Look at a pictorial
>> representation (in the time domain) of the sum of sine waves,of similar
>> amplitudes, one at, say, 1000 Hz and the other at 1005, and you'll
>> see it.
>>
>> Bob M.
>>
>
> How come you don't hear a 200 Hz beat
> with a 1000 Hz tone and a 1200 Hz tone?

For the simple reason that there isn't actually a "tone" involved -
in other words, there is no actual signal at the difference frequency.
There can't be, since there is no "mixing" (multiplication) of the
two original tones. The "beat" is really just the perception of
the amplitude variation caused by the interference previously
mentioned. You cannot sense such variations if they occur
rapidly enough, any more than you can detect the flicker of a
light source which is varying rapidly enough.

Bob M.