SoDa::Spectrogram Class Reference

#include <Spectrogram.hxx>

Inheritance diagram for SoDa::Spectrogram:

Public Member Functions
void	apply_acc (std::vector< std::complex< float > > &invec, std::vector< float > &outvec, float accumulation_gain=0.0)
	Calculate the spectrogram from an input vector – add it to an accumulation buffer.
void	apply_max (std::vector< std::complex< float > > &invec, std::vector< float > &outvec, bool first=true)
	Calculate the spectrogram from an input vector – add it to an accumulation buffer.
Public Member Functions inherited from SoDa::Base
	Base (const std::string &oname)
	The constructor – pass a name for the object.
void	registerSelf (BasePtr ptr)
std::string &	getObjName ()
	get the name of this object
BasePtr	findSoDaObject (const std::string &oname)
	find a SoDa Object by name.
double	getTime ()
	Get a time stamp in nS resolution that monotonically increases and that is very inexpensive (typically < 100nS).
BasePtr	getSelfPtr ()
	get a pointer to myself.

Static Public Member Functions
static SpectrogramPtr	make (unsigned int fftlen)

Protected Member Functions
	Spectrogram (unsigned int fftlen)
	Constructor.

Private Member Functions
float *	initBlackmanHarris ()
	all spectrograms are under a blackman harris window
void	apply_common (std::vector< std::complex< float > > &invec)
	this is the common spectrogram calculation (window + fft + mag)

Private Attributes
fftwf_plan	fftplan
float *	window
std::complex< float > *	win_samp
std::complex< float > *	fft_out
float *	result
unsigned int	fft_len

Detailed Description

Definition at line 46 of file Spectrogram.hxx.

Constructor & Destructor Documentation

Spectrogram()

SoDa::Spectrogram::Spectrogram ( unsigned int fftlen )

protected

Constructor.

Parameters

fftlen

how many frequency points in the spectrogram buffer

Referenced by make().

Member Function Documentation

apply_acc()

void SoDa::Spectrogram::apply_acc	(	std::vector< std::complex< float > > &	invec,
		std::vector< float > &	outvec,
		float	accumulation_gain = 0.0 )

Calculate the spectrogram from an input vector – add it to an accumulation buffer.

Parameters

invec	the input sample buffer
outvec	the result buffer
accumulation_gain	(out = result + out * acc_gain)

apply_common()

void SoDa::Spectrogram::apply_common ( std::vector< std::complex< float > > & invec )

private

this is the common spectrogram calculation (window + fft + mag)

Parameters

invec

the buffer we're going to operate on

apply_max()

void SoDa::Spectrogram::apply_max	(	std::vector< std::complex< float > > &	invec,
		std::vector< float > &	outvec,
		bool	first = true )

Calculate the spectrogram from an input vector – add it to an accumulation buffer.

Parameters

invec	the input sample buffer
outvec	the result buffer (out = max(result, out))
first	if true, ignore contents of outvec...

initBlackmanHarris()

float * SoDa::Spectrogram::initBlackmanHarris ( )

private

all spectrograms are under a blackman harris window

make()

SpectrogramPtr SoDa::Spectrogram::make ( unsigned int fftlen )

inlinestatic

Definition at line 56 of file Spectrogram.hxx.

References Spectrogram().

Member Data Documentation

fft_len

unsigned int SoDa::Spectrogram::fft_len

private

Definition at line 105 of file Spectrogram.hxx.

fft_out

std::complex<float>* SoDa::Spectrogram::fft_out

private

Definition at line 103 of file Spectrogram.hxx.

fftplan

fftwf_plan SoDa::Spectrogram::fftplan

private

Definition at line 100 of file Spectrogram.hxx.

result

float* SoDa::Spectrogram::result

private

Definition at line 104 of file Spectrogram.hxx.

win_samp

std::complex<float>* SoDa::Spectrogram::win_samp

private

Definition at line 102 of file Spectrogram.hxx.

window

float* SoDa::Spectrogram::window

private

Definition at line 101 of file Spectrogram.hxx.

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

• src/Spectrogram.hxx