The A440 (A above middle C) tone, which is used as a general tuning standard for musical pitch. It is also broadcast by WWV, the radio station of the National Institute of Standards and Technology.
Author: Original uploader was Denelson83 at en.wikipedia.
Rauhigkeit 1 Apser = Sinus 1000 Hz und Sinus 1070 Hz gleichzeitig.The sound of a harshness of 1 asper = a sine wave tone of 1000 Hz 100 % modulated with a sine wave tone of 70 Hz at 60 dB sound pressure.
Sum and difference tones of A220 and unison, just perfect fifth, and octave. Note that this is not produced through ring modulation of two notes, but is four separate notes.
Difference tones between Yankee Doodle in F and a drone on C. F=8/5 (1/1), G=9/5 (9/8), A440=1/1 (5/4), C=6/5 (3/2). Top and bottom line and difference tones.
Difference tones between Yankee Doodle in F and a drone on C. F=8/5 (1/1), G=9/5 (9/8), A440=1/1 (5/4), C=6/5 (3/2). Top and bottom line without difference tones.
*1 step in 72 equal temperament on C. Equal-tempered: 21/72:1 = 16.67 cents. MIDI pitch bend: 43,69 Created in Sibelius with midi pitch bend on 69 for 15.625 cents rather than 16.667. New version a PU on 43,69 for 16.6748046875 cents.