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rhythm-math

v1.0.0

Published

Rhythm mathematics for the browser and web audio — tempo, polyrhythm, groove, syncopation, and meter

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Links

Git

Maintainers

superinstancesuperinstance

Keywords

rhythmmusicpolyrhythmgroovetempometersyncopationweb-audio

Readme

rhythm-math

Rhythm mathematics for the browser and web audio — tempo, polyrhythm, groove, syncopation, and meter.

Install

npm install rhythm-math

API

Types

  • Tempo — { bpm: number }
  • Polyrhythm — { rates: number[] }
  • Groove — { velocities: number[], offsets: number[] }
  • Meter — { numerator: number, denominator: number }

Tempo

  • bpmToMs(bpm) → milliseconds per beat
  • msToBpm(ms) → BPM
  • tempoCurve(start, end, steps, curve) → number[] where curve is "linear", "exponential", or "logarithmic"

Polyrhythm

  • polyrhythmCycleLength(rates) → LCM of rates
  • polyrhythmPattern(rates) → binary arrays per voice
  • polyrhythmDensity(rates) → average hit density

Groove

  • swingFactor(grid, amount) → swung grid positions
  • grooveVelocity(pattern, accents?) → MIDI velocities (0–127)
  • microtiming(offsets, humanize) → humanized offsets

Syncopation

  • syncopationScore(pattern, meterNumerator) → Longuet-Higgins/Lee score
  • offbeatDensity(pattern, meterNumerator) → fraction of off-beat hits
  • rhythmicEntropy(pattern) → Shannon entropy of interval distribution

Meter

  • isSimple(meter), isCompound(meter), isOdd(meter) → boolean
  • beatCount(meter) → main beats per measure
  • subdivision(meter) → subdivisions per beat
  • downbeats(measures, meter) → downbeat positions
  • timeSignatureChanges(meters, repeats?) → expanded meter sequence

License

MIT