librosax.feature.note_to_hz

note_to_hz(note: str, *, round_midi: bool = False) → floating[Any][source]
note_to_hz(note: List[str] | Tuple[str, ...] | Generator[str, None, None], *, round_midi: bool = False) → Array
note_to_hz(note: str | List[str] | Tuple[str, ...] | Generator[str, None, None] | Iterable[str], *, round_midi: bool = False) → floating[Any] | Array

Convert one or more note names to frequency (Hz).

Parameters:

  • note – One or more note names to convert.

  • round_midi – If True, quantize to the nearest semitone before converting to frequency. Defaults to False, so tuning deviations spelled in the note name are preserved.

Returns:

Array of frequencies (in Hz) corresponding to note.

See also

midi_to_hz: Convert MIDI note numbers to frequencies. note_to_midi: Convert note names to MIDI numbers. hz_to_note: Convert frequencies to note names.

Examples

>>> # Get the frequency of a note
>>> librosax.note_to_hz('C')
array([ 16.352])
>>> # Or multiple notes
>>> librosax.note_to_hz(['A3', 'A4', 'A5'])
array([ 220.,  440.,  880.])
>>> # Tuning deviations are preserved by default
>>> librosax.note_to_hz('C2-32')
array([ 64.209])
>>> # Quantize to the nearest semitone instead
>>> librosax.note_to_hz('C2-32', round_midi=True)
array([ 65.406])