stft

Documentation

Overview

Package stft provides support for Short-Time Fourier Transform (STFT) Analysis.

Index

• type STFT
  • func New(frameShift, frameLen int) *STFT
  • func (s *STFT) DivideFrames(input []float64) [][]float64
  • func (s *STFT) FrameAt(input []float64, index int) []float64
  • func (s *STFT) ISTFT(spectrogram [][]complex128) []float64
  • func (s *STFT) NumFrames(input []float64) int
  • func (s *STFT) STFT(input []float64) [][]complex128

Types

type STFT

type STFT struct {
	FrameShift int
	FrameLen   int
	Window     []float64 // window funtion
}

STFT represents Short Time Fourier Transform Analysis.

func New

func New(frameShift, frameLen int) *STFT

New returns a new STFT instance.

func (*STFT) DivideFrames

func (s *STFT) DivideFrames(input []float64) [][]float64

DivideFrames returns overlapping divided frames for STFT.

func (*STFT) FrameAt

func (s *STFT) FrameAt(input []float64, index int) []float64

FrameAt returns frame at specified index given an input signal. Note that it doesn't make copy of input.

func (*STFT) ISTFT

func (s *STFT) ISTFT(spectrogram [][]complex128) []float64

ISTFT performs invere STFT signal reconstruction and returns reconstructed signal.

func (*STFT) NumFrames

func (s *STFT) NumFrames(input []float64) int

NumFrames returnrs the number of frames that will be analyzed in STFT.

func (*STFT) STFT

func (s *STFT) STFT(input []float64) [][]complex128

STFT returns complex spectrogram given an input signal.