low / high pass filter of 1D result More...

#include <operations.h>

Inheritance diagram for cass::pp89:

Collaboration diagram for cass::pp89:

Public Member Functions
	pp89 (const name_t &name)
	constructor More...

virtual void	process (const CASSEvent &, result_t &)
	process event More...

virtual void	loadSettings (size_t)
	load the settings of the pp More...

Public Member Functions inherited from cass::Processor
	Processor (const name_t &name)
	constructor More...

virtual	~Processor ()
	virtual destructor More...

virtual void	processEvent (const CASSEvent &event)
	process the event More...

virtual const result_t &	result (const CASSEvent::id_t eventid=0)
	retrieve a result for a given id. More...

virtual void	releaseEvent (const CASSEvent &event)
	tell the list that the result for event can be overwritten More...

result_t::shared_pointer	resultCopy (const uint64_t eventid)
	retrieve histogram for id More...

virtual void	load ()
	load the general settings More...

virtual void	aboutToQuit ()
	function that will be called when the processor is about to be deleted More...

const names_t &	dependencies ()
	Define all processors keys a processor depends on. More...

void	clearDependencies ()
	clear the dependenies More...

void	clearHistograms ()
	clear the histograms More...

virtual void	processCommand (std::string command)
	process command in pp More...

const name_t	name () const
	retrieve the name of this processor More...

bool	hide () const
	retrieve the hide flag of this processor More...

const std::string &	comment () const
	retrieve the comment of this processor More...

Protected Member Functions
void	highPass (result_t::const_iterator orig, result_t::iterator filtered)
	high pass filtering function More...

void	lowPass (result_t::const_iterator orig, result_t::iterator filtered)
	low pass filtering function More...

Protected Member Functions inherited from cass::Processor
virtual void	createHistList (result_t::shared_pointer result)
	create result list. More...

void	setupGeneral ()
	general setup of the processor More...

bool	setupCondition (bool defaultConditionType=true)
	setup the condition. More...

shared_pointer	setupDependency (const std::string &depVarName, const name_t &name="")
	setup the dependecy. More...

Protected Attributes
shared_pointer	_pHist
	processor containing input result More...

float	_alpha
	factor used for filtering More...

std::tr1::function< void(result_t::const_iterator, result_t::iterator)>	_func
	function to retrieve the parameter from the axis More...

Protected Attributes inherited from cass::Processor
const name_t	_name
	the processors name More...

bool	_hide
	flag to tell whether this pp should be hidden in the dropdown list More...

std::string	_comment
	optional comment that one can add to a processor. More...

CachedList	_resultList
	the list of results More...

names_t	_dependencies
	the list of dependencies More...

shared_pointer	_condition
	pointer to the processor that will contain the condition More...

Additional Inherited Members
Public Types inherited from cass::Processor
typedef std::tr1::shared_ptr< Processor >	shared_pointer
	a shared pointer of this More...

typedef std::string	name_t
	define the name type More...

typedef std::list< name_t >	names_t
	define the list of names More...

typedef CachedList::item_type	result_t
	define the results More...

typedef CachedList::item_sp	resultsp_t
	define the shared pointer to the result More...

Detailed Description

low / high pass filter of 1D result

Available PostProcessors:: "89":high or low pass filter on 1D result

inspired by code found at http://stackoverflow.com/questions/13882038/implementing-simple-high-and-low-pass-filters-in-c copright Slater Tyrus

HighPass function:

float RC = 1.0/(CUTOFF*2*3.14);
float dt = 1.0/SAMPLE_RATE;
float alpha = RC/(RC + dt);
float filteredArray[numSamples];
filteredArray[0] = data.recordedSamples[0];
for (i = 1; i<numSamples; i++){
  filteredArray[i] = alpha * (filteredArray[i-1] + data.recordedSamples[i] - data.recordedSamples[i-1]);
}
data.recordedSamples = filteredArray;

LowPass function:

float RC = 1.0/(CUTOFF*2*3.14);
float dt = 1.0/SAMPLE_RATE;
float alpha = dt/(RC+dt);
float filteredArray[numSamples];
filteredArray[0] = data.recordedSamples[0];
for(i=1; i<numSamples; i++){
  filteredArray[i] = filteredArray[i-1] + (alpha*(data.recordedSamples[i] - filteredArray[i-1]));
}
data.recordedSamples = filteredArray;

See also: Processor for a list of all commonly available cass.ini settings.

User definable Parameters:

Processor/%name%/{InputName}
Name of the processor that contains the 1D result to filter

Processor/%name%/{FilterType}
The filter type to use. Default is "LowPass". Possible values are:

"LowPass": a low pass filter
"HighPass": a high pass filter

Processor/%name%/{Cutoff}
The cutoff of the filter.

Processor/%name%/{SampleRate}
The sampling rate of the filter

Author: Lutz Foucar

Definition at line 2300 of file operations.h.

Constructor & Destructor Documentation

pp89::pp89 ( const name_t & name )

constructor

Definition at line 3178 of file operations.cpp.

References loadSettings().

Member Function Documentation

void pp89::highPass	(	result_t::const_iterator	orig,
		result_t::iterator	filtered
	)

protected

high pass filtering function

Parameters

orig	iterator to the original value
filtered	iterator to the filtered value

Definition at line 3231 of file operations.cpp.

References _alpha.

Referenced by loadSettings().

void pp89::loadSettings ( size_t )

virtual

load the settings of the pp

Reimplemented from cass::Processor.

Definition at line 3184 of file operations.cpp.

References _alpha, cass::Processor::_condition, _func, _pHist, cass::Log::add(), QSettings::beginGroup(), cass::Processor::createHistList(), QString::fromStdString(), highPass(), cass::Log::INFO, lowPass(), cass::Processor::name(), cass::Processor::setupCondition(), cass::Processor::setupDependency(), cass::Processor::setupGeneral(), and QSettings::value().

Referenced by pp89().

void pp89::lowPass	(	result_t::const_iterator	orig,
		result_t::iterator	filtered
	)

protected

low pass filtering function

Parameters

orig	iterator to the original value
filtered	iterator to the filtered value

Definition at line 3248 of file operations.cpp.

References _alpha.

Referenced by loadSettings().

void pp89::process	(	const CASSEvent &	evt,
		result_t &	result
	)

virtual

process event

Reimplemented from cass::Processor.

Definition at line 3264 of file operations.cpp.

References _func, _pHist, cass::Result< T >::begin(), cass::Result< T >::datasize(), cass::CASSEvent::id(), and cass::Result< T >::lock.

Member Data Documentation

float cass::pp89::_alpha

protected

factor used for filtering

Definition at line 2333 of file operations.h.

Referenced by highPass(), loadSettings(), and lowPass().

std::tr1::function<void(result_t::const_iterator, result_t::iterator)> cass::pp89::_func

protected

function to retrieve the parameter from the axis

Definition at line 2337 of file operations.h.

Referenced by loadSettings(), and process().

shared_pointer cass::pp89::_pHist

protected

processor containing input result

Definition at line 2330 of file operations.h.

Referenced by loadSettings(), and process().

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

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation