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librosa.tuning_to_A4
- librosa.tuning_to_A4(tuning, *, bins_per_octave=12)[source]
Convert a tuning deviation (from 0) in fractions of a bin per octave (e.g.,
tuning=-0.1) to a reference pitch frequency relative to A440.This is useful if you are working in a non-A440 tuning system to determine the reference pitch frequency given a tuning offset and assuming equal temperament. By default, 12 bins per octave are used.
This method is the inverse of
A4_to_tuning.- Parameters:
- tuningfloat or np.ndarray [shape=(n,), dtype=float]
Tuning deviation from A440 in fractional bins per octave.
- bins_per_octaveint > 0
Number of bins per octave.
- Returns:
- A4float or np.ndarray [shape=(n,), dtype=float]
Reference frequency corresponding to A4.
See also
Examples
The base case of this method in which a tuning deviation of 0 gets us to our A440 reference pitch.
>>> librosa.tuning_to_A4(0.0) 440.
Convert a nonzero tuning offset to its reference pitch frequency.
>>> librosa.tuning_to_A4(-0.318) 431.992
Convert 3 tuning deviations at once to respective reference pitch frequencies, using 36 bins per octave.
>>> librosa.tuning_to_A4([0.1, 0.2, -0.1], bins_per_octave=36) array([ 440.848, 441.698 439.154])