D#0
19.45 Hz
The note D♯0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.
How well is this supported?
StandardMusical standard
Measured directly, or defined by a published standard.
This is a note in standard tuning. Its value is set by definition, not measured.
This is too slow or too fast to hear, so the button plays it moved by whole octaves. Start with the volume low.
About this number
Musical note D# in octave 0. Sub-bass range.
Facts
- Frequency
- 19.45 Hz
- Kind of statement
- Musical standard
- Filed under
- Musical notes
Sources
- Twelve-tone equal temperament, A4 = 440 Hz
Each note is the one below it multiplied by the twelfth root of two. A4 is fixed at 440 Hz by ISO 16.
ISO 16:1975, Acoustics — Standard tuning frequency (Standard musical pitch).
More about the pitch
Whole-number multiples
Two, three, four times the frequency, and so on. A string or a flute sounds overtones at these values. A gong does not follow this pattern.