dsp

Documentation

Overview

Package dsp provides audio analysis

Some notes:

https://dlbeer.co.nz/articles/fftvis.html https://www.cg.tuwien.ac.at/courses/WissArbeiten/WS2010/processing.pdf https://github.com/hvianna/audioMotion-analyzer/blob/master/src/audioMotion-analyzer.js#L1053 https://dsp.stackexchange.com/questions/6499/help-calculating-understanding-the-mfccs-mel-frequency-cepstrum-coefficients https://stackoverflow.com/questions/3694918/how-to-extract-frequency-associated-with-fft-values-in-python

• https://stackoverflow.com/a/27191172

Index

• func AverageSamples(count int, current, new float64) float64
• func MaxSamples(count int, current, new float64) float64
• func SumSamples(count int, current, new float64) float64
• type Analyzer
  • func NewAnalyzer(cfg AnalyzerConfig) Analyzer
• type AnalyzerConfig
• type BinMethod
• type Smoother
  • func NewSmoother(cfg SmootherConfig) Smoother
• type SmootherConfig

Functions

func AverageSamples

func AverageSamples(count int, current, new float64) float64

Average all the samples together

func MaxSamples

func MaxSamples(count int, current, new float64) float64

Return the maximum value of all the samples

func SumSamples

func SumSamples(count int, current, new float64) float64

Sum all the samples together

Types

type Analyzer

type Analyzer interface {
	BinCount() int
	ProcessBin(int, []complex128) float64
	Recalculate(int) int
}

func NewAnalyzer

func NewAnalyzer(cfg AnalyzerConfig) Analyzer

type AnalyzerConfig

type AnalyzerConfig struct {
	SampleRate float64   // audio sample rate
	SampleSize int       // number of samples per slice
	SquashLow  bool      // squash the low end the spectrum
	BinMethod  BinMethod // method used for calculating bin value
}

type BinMethod

type BinMethod func(int, float64, float64) float64

type Smoother

type Smoother interface {
	SmoothBin(int, int, float64) float64
}

func NewSmoother

func NewSmoother(cfg SmootherConfig) Smoother

type SmootherConfig

type SmootherConfig struct {
	SampleSize      int     // number of samples per slice
	ChannelCount    int     // number of channels
	SmoothingFactor float64 // smoothing factor
}