Noun
A440 (uncountable)
(music) A 440 Hertz musical pitch, which serves as the tuning standard for the note A above middle C in concert pitch.
A frequency of 440 Hz was recommended as the standard pitch for Concert A in 1939, and in 1955 the International Organization for Standardization affirmed the choice.sfn A440 is now widely, though not exclusively, the standard for music around the world. Source: Internet
And in the opposite direction, to obtain the frequency from a MIDI note p, the formula is defined as: : For notes in an A440 equal temperament, this formula delivers the standard MIDI note number (p). Source: Internet
An alternative to the usual A440 diatonic scale is that of philosophical or scientific pitch with standard pitch of C512. Source: Internet
Another influential V6 design was the Renault Gordini CH1 V6, designed by François Castaing and Jean-Pierre Boudy, and introduced in 1973 in the Alpine -Renault A440. Source: Internet
Middle C When the A440 pitch standard is used to tune a musical instrument, Middle C has a frequency around 261.6 Hz. Source: Internet