The name of the note in the current tuning system
Frequency ratio expressed as a fraction (e.g., "3/2")
Pitch measurement in cents relative to a reference
Frequency ratio as a decimal number
Relative string length for string instruments
Fret position for fretted instruments
Absolute frequency in Hz
MIDI note number representation
The original input value used to create this pitch class
The type of the original value ("fraction", "cents", "decimalRatio", "stringLength")
English name of the note
Arabic/Abjad name of the note
Position index within the scale or tuning system
Octave number
Deviation in cents from the nearest equal-tempered pitch
OptionalreferenceOptional reference note name for relative calculations
A Pitch class in oriental musicology is a fundamental abstraction that represents a musical relation of a musical pitch. Rather than defining absolute properties with frequencies, it uses relational measurements like cents, string length, fraction ratio, and decimal ratio. When used within the context of a tuning system, the pitch class will be linked to a note name and an audible frequency. This relational approach enables systematic analysis of transpositions and modulations, as interval relationships between the pitch classes are maintained regardless of the reference frequency.