librosa::Feature Class Reference

Static Public Member Functions
static std::vector< std::vector< std::complex< float > > >	stft (std::vector< float > &x, int n_fft, int n_hop, int window_length, const std::string &win, bool center, const std::string &mode)
	short-time fourier transform similar with librosa.feature.stft More...
static std::vector< std::vector< float > >	melspectrogram (std::vector< float > &x, Matrixf &sp, int sr, int n_fft, int n_hop, int window_length, const std::string &win, bool center, const std::string &mode, float power, int n_mels, int fmin, int fmax)
	compute mel spectrogram similar with librosa.feature.melspectrogram More...
static std::vector< float >	zeroCrossingRate (std::vector< float > &x, int frame_length, int hop_length, int pad)
static std::vector< float >	rms (std::vector< float > &x, int frame_length, int hop_length)
static std::vector< std::vector< float > >	mfcc (std::vector< float > &x, int sr, int n_fft, int n_hop, int window_length, const std::string &win, bool center, const std::string &mode, float power, int n_mels, int fmin, int fmax, int n_mfcc, bool norm, int type)
	compute mfcc similar with librosa.feature.mfcc More...
static Vectorf	spectralCentroid (Matrixf &sp, Vectorf &fft_freqs)
static std::vector< float >	spectralRolloff (Matrixf &sp, Vectorf &fft_freqs, float roll_percent)
static std::vector< float >	spectralBandwidth (Matrixf &sp, Vectorf &centroid, Vectorf &fft_freqs)

Member Function Documentation

static std::vector<std::vector<float> > librosa::Feature::melspectrogram ( std::vector< float > &  x, Matrixf &  sp, int  sr, int  n_fft, int  n_hop, int  window_length, const std::string &  win, bool  center, const std::string &  mode, float  power, int  n_mels, int  fmin, int  fmax  )

inlinestatic

compute mel spectrogram similar with librosa.feature.melspectrogram

Parameters

x	input audio signal
sr	sample rate of 'x'
n_fft	length of the FFT size
n_hop	number of samples between successive frames
win	window function. currently only supports 'hann'
center	same as librosa
mode	pad mode. support "reflect","symmetric","edge"
power	exponent for the magnitude melspectrogram
n_mels	number of mel bands
f_min	lowest frequency (in Hz)
f_max	highest frequency (in Hz)

Returns

mel spectrogram matrix

static std::vector<std::vector<float> > librosa::Feature::mfcc ( std::vector< float > &  x, int  sr, int  n_fft, int  n_hop, int  window_length, const std::string &  win, bool  center, const std::string &  mode, float  power, int  n_mels, int  fmin, int  fmax, int  n_mfcc, bool  norm, int  type  )

inlinestatic

compute mfcc similar with librosa.feature.mfcc

Parameters

x	input audio signal
sr	sample rate of 'x'
n_fft	length of the FFT size
n_hop	number of samples between successive frames
win	window function. currently only supports 'hann'
center	same as librosa
mode	pad mode. support "reflect","symmetric","edge"
power	exponent for the magnitude melspectrogram
n_mels	number of mel bands
f_min	lowest frequency (in Hz)
f_max	highest frequency (in Hz)
n_mfcc	number of mfccs
norm	ortho-normal dct basis
type	dct type. currently only supports 'type-II'

Returns

mfcc matrix

static std::vector<std::vector<std::complex<float> > > librosa::Feature::stft ( std::vector< float > &  x, int  n_fft, int  n_hop, int  window_length, const std::string &  win, bool  center, const std::string &  mode  )

inlinestatic

short-time fourier transform similar with librosa.feature.stft

Parameters

x	input audio signal
n_fft	length of the FFT size
n_hop	number of samples between successive frames
win	window function. currently only supports 'hann'
center	same as librosa
mode	pad mode. support "reflect","symmetric","edge"

Returns

complex-valued matrix of short-time fourier transform coefficients.

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The documentation for this class was generated from the following file:

• librosa.h