import MusicTempo from 'music-tempo/src/MusicTempo.js'

public class | source

MusicTempo

Class combines the work of all the steps of tempo extraction

Constructor Summary

Public Constructor
public	constructor(audioData: Float32Array, params: Object) Constructor

Member Summary

Public Members
public	agents: Array Agents array
public	beatInterval: Number Inter-beat interval
public	beats: Array Beat times array
public	bestAgent: Agent The agent with the highest score
public	events: Array Onsets times array
public	peaks: Array Spectral flux peaks indexes
public	spectralFlux: Array Spectral flux
public	tempo: Number The tempo value in beats per minute
public	tempoList: Array Tempo hypotheses array

Public Constructors

public constructor(audioData: Float32Array, params: Object) source

Constructor

Params:

Name	Type	Attribute	Description
audioData	Float32Array		non-interleaved IEEE 32-bit linear PCM with a nominal range of -1 -> +1 (Web Audio API - Audio Buffer)
params	Object	optional default: {}	parameters
params.bufferSize	Number	optional default: 2048	FFT windows size
params.hopSize	Number	optional default: 441	spacing of audio frames in samples
params.decayRate	Number	optional default: 0.84	how quickly previous peaks are forgotten
params.peakFindingWindow	Number	optional default: 6	minimum distance between peaks
params.meanWndMultiplier	Number	optional default: 3	multiplier for peak finding window
params.peakThreshold	Number	optional default: 0.35	minimum value of peaks
params.widthTreshold	Number	optional default: 0.025	the maximum difference in IOIs which are in the same cluster
params.maxIOI	Number	optional default: 2.5	the maximum IOI for inclusion in a cluster
params.minIOI	Number	optional default: 0.07	the minimum IOI for inclusion in a cluster
params.maxTempos	Number	optional default: 10	initial amount of tempo hypotheses
params.minBeatInterval	Number	optional default: 0.3	the minimum inter-beat interval (IBI) (0.30 seconds == 200 BPM)
params.maxBeatInterval	Number	optional default: 1	the maximum inter-beat interval (IBI) (1.00 seconds == 60 BPM)
params.initPeriod	Number	optional default: 5	duration of the initial section
params.thresholdBI	Number	optional default: 0.02	for the purpose of removing duplicate agents, the default JND of IBI
params.thresholdBT	Number	optional default: 0.04	for the purpose of removing duplicate agents, the default JND of phase
params.expiryTime	Number	optional default: 10	the time after which an Agent that has not accepted any beat will be destroyed
params.toleranceWndInner	Number	optional default: 0.04	the maximum time that a beat can deviate from the predicted beat time without a fork occurring
params.toleranceWndPre	Number	optional default: 0.15	the maximum amount by which a beat can be earlier than the predicted beat time, expressed as a fraction of the beat period
params.toleranceWndPost	Number	optional default: 0.3	the maximum amount by which a beat can be later than the predicted beat time, expressed as a fraction of the beat period
params.correctionFactor	Number	optional default: 50	correction factor for updating beat period
params.maxChange	Number	optional default: 0.2	the maximum allowed deviation from the initial tempo, expressed as a fraction of the initial beat period
params.penaltyFactor	Number	optional default: 0.5	factor for correcting score, if onset do not coincide precisely with predicted beat time

Public Members

public agents: Array source

Agents array

public beatInterval: Number source

Inter-beat interval

public beats: Array source

Beat times array

public bestAgent: Agent source

The agent with the highest score

public events: Array source

Onsets times array

public peaks: Array source

Spectral flux peaks indexes

public spectralFlux: Array source

Spectral flux

public tempo: Number source

The tempo value in beats per minute

public tempoList: Array source

Tempo hypotheses array