Extracts the High ZCR Ratio (ZCR stands for Zero Crossing Rate) More...

#include <hzcrr.h>

Inheritance diagram for HZCRRExtr:

Public Member Functions
	HZCRRExtr (int chunkSize=0)
	Default constructor.
	~HZCRRExtr ()
	Destructor.
ZCRExtr *	setZCRExtractor (ZCRExtr *extr)
	Set the ZCR extractor (the previous one is returned)
bool	extract (std::deque< uint16_t > data, int size)
	Run the algorithm and store the results.
float	value (int index=0)
	Retrieve the results (from the index). The values are usually between -1 and 1.
int	size ()
	Get the number of available values.
float	min ()
	Lower bound on outputted values.
float	max ()
	Upper bound on outputted values.
void	setFloat (string key, float value)
	Set a float parameter (available : "bound")
void	setInt (string key, int value)
	Set a int parameter (available : "chunksNumber")
float	getFloat (string key)
	Get a float parameter (available : "bound")
int	getInt (string key)
	Get a int parameter (available : "chunksNumber")
Public Member Functions inherited from FeatureExtractor
	FeatureExtractor (int chunkSize=0)
	Constructor. Can set the typical chunk size.
virtual	~FeatureExtractor ()
	Virtual destructor : enables each extractor to delete arrays.
bool	extract (std::deque< uint16_t > data, int size, size_t start)
	Idem, but the buffer starts at index start instead (circular buffer)
virtual float	safeValue (int index=0)
	Retrieve the results, with the bounds respected (we apply a min / max)
virtual float	value (int index, float low, float high)
	Retrieve the results, with other bounds.
virtual void	setString (string key, string value)
	Set a string parameter.
virtual string	getString (string key)
	Get a string parameter.
virtual void	clear ()
	Clear the memory of the extractor (so that the previously computed results don't infer to the next ones)

Detailed Description

Extracts the High ZCR Ratio (ZCR stands for Zero Crossing Rate)

This value is defined by Lie Lu, Hong-Jiang Zhang by the percentage of the frames that have ZCR above 1.5 the average on an 1 sec window.

Member Function Documentation

bool HZCRRExtr::extract	(	std::deque< uint16_t >	data,
		int	size
	)

virtual

Run the algorithm and store the results.

Run the algorithm and store the results Implementation : A ZCR extractor is set, and can be used outside the extractor, so that the values aren't computed twice.

A ZCR history is created : we compute the ZCR for each frame and update the HZCRR. The history is a circular buffer.

Implements FeatureExtractor.

int HZCRRExtr::getInt ( string key )

virtual

Get a int parameter (available : "chunksNumber")

Get a int parameter (available : "chunkSize")

Reimplemented from FeatureExtractor.

void HZCRRExtr::setInt	(	string	key,
		int	value
	)

virtual

Set a int parameter (available : "chunksNumber")

Set a int parameter (available : "chunkSize")

Reimplemented from FeatureExtractor.

ZCRExtr * HZCRRExtr::setZCRExtractor ( ZCRExtr * extr )

Set the ZCR extractor (the previous one is returned)

Set the ZCR extractor that should be used by this extractor.

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

include/features/hzcrr.h
src/features/hzcrr.cpp

Public Member Functions

Detailed Description

Member Function Documentation