Beats are also the result of two frequencies destructively
and constructively interfering
. The corresponding peaks and valleys in total signal strength form beats
, with each cycle
one beat. This phenomenon
can be easily observed when watching a piano
or guitar tuner
; the electronic devices used for this purpose visually display the beats generated by playing a reference tone along with the corresponding piano key
or guitar string
. The slower the beats, the closer the frequencies are to identical; when the beats have been eliminated, the string is tuned.
tdent informs me that when tuning tempered fifths by ear, one "looks for a certain number of beats rather than eliminating them entirely." Thanks!