Recognised as Musical note

A#0

A#0
29.14 Hz
MIDI 22

A#0 (enharmonically Bb0) is MIDI note 22, sounding at 29.135 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 11.7727 m, and it sits in octave 0.

Pitch

Scientific pitch notationA#0

Enharmonic equivalentBb0the same pitch in equal temperament, spelled differently

MIDI note number22

Frequency29.1352 Hzequal temperament, A4 = 440 Hz, a convention rather than a constant

Pitch classA# (10)

Octave0

As a sound wave

Wavelength in air11.7727 mat 343 m/s, dry air at 20 °C

Period34.3227 ms

Frequency one octave up58.27 Hzdoubling the frequency

Frequency one octave down14.568 Hz

AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age

Intervals from here

Octave belowA#-1 · 14.57 Hz

Perfect fifth belowD#0 · 19.45 Hz

Semitone belowA0 · 27.5 Hz

Semitone aboveB0 · 30.87 Hz

Major third aboveD1 · 36.71 Hz

Perfect fifth aboveF1 · 43.65 Hz

Octave aboveA#1 · 58.27 Hz

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The same note in other octaves

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