A♯ (A-sharp; also called la dièse) is the eleventh semitone of the solfège. In some countries (where B is known as H), it is also called B.
This note lies a chromatic semitone above A and a diatonic semitone below B, thus being enharmonic to si bémol or B♭ (B- flat).
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the A♯ above middle C is approximately 466.164Hz. [1] See pitch (music) for a discussion of historical variations in frequency.
Scientific designation | Helmholtz designation | Octave name | Frequency (Hz) |
---|---|---|---|
A♯−1 | A♯͵͵͵ or ͵͵͵A♯ or AAAA♯ | Subsubcontra | 14.568 |
A♯0 | A♯͵͵ or ͵͵A♯ or AAA♯ | Subcontra | 29.135 |
A♯1 | A♯͵ or ͵A♯ or AA♯ | Contra | 58.27 |
A♯2 | A♯ | Great | 116.541 |
A♯3 | a♯ | Small | 233.082 |
A♯4 | a♯′ | One-lined | 466.164 |
A♯5 | a♯′′ | Two-lined | 932.328 |
A♯6 | a♯′′′ | Three-lined | 1864.655 |
A♯7 | a♯′′′′ | Four-lined | 3729.31 |
A♯8 | a♯′′′′′ | Five-lined | 7458.62 |
A♯9 | a♯′′′′′′ | Six-lined | 14917.24 |
A♯10 | a♯′′′′′′′ | Seven-lined | 29834.481 |