Implements the basic FSK/AFSK symbol detection. More...

#include <fsk.hh>

Inheritance diagram for sdr::FSKDetector:

Public Member Functions
	FSKDetector (float baud, float Fmark, float Fspace)
	Constructor. More...

void	config (const Config &src_cfg)
	Needs to be implemented by any sub-type to check and perform the configuration of the node. More...

void	process (const Buffer< int16_t > &buffer, bool allow_overwrite)
	Needs to be implemented by any sub-type to process the received data. More...

Public Member Functions inherited from sdr::Sink< int16_t >
	Sink ()
	Constructor. More...

virtual	~Sink ()
	Drestructor. More...

virtual void	handleBuffer (const RawBuffer &buffer, bool allow_overwrite)
	Re-implemented from `SinkBase`. More...

Public Member Functions inherited from sdr::SinkBase
	SinkBase ()
	Constructor. More...

virtual	~SinkBase ()
	Destructor. More...

Public Member Functions inherited from sdr::Source
	Source ()
	Constructor. More...

virtual	~Source ()
	Destructor. More...

virtual void	send (const RawBuffer &buffer, bool allow_overwrite=false)
	Sends the given buffer to all connected sinks. More...

void	connect (SinkBase *sink, bool direct=false)
	Connect this source to a sink. More...

void	disconnect (SinkBase *sink)
	Disconnect a sink again. More...

virtual void	setConfig (const Config &config)
	Stores the configuration and propergates it if the configuration has been changed. More...

virtual double	sampleRate () const
	Returns the configured sample rate or `0` otherwise. More...

virtual Config::Type	type () const
	Returns the configured source type or `Config::Type_UNDEFINED` otherwise. More...

template<class T >
void	addEOS (T instance, void(T::function)())
	Adds a callback to the end-of-stream signal of the source. More...

Protected Member Functions
uint8_t	_process (int16_t sample)
	Updates the mark/space FIR filter and returns the sampled symbol. More...

Protected Member Functions inherited from sdr::Source
void	signalEOS ()
	Signals the EOS. More...

void	propagateConfig (const Config &config)
	Propagates the given configuration to all connected sinks. More...

Protected Attributes
float	_baud
	Baudrate of the transmission. More...

size_t	_corrLen
	The filter lenght. More...

size_t	_lutIdx
	The current FIR filter LUT index. More...

float	_Fmark
	Mark "tone" frequency. More...

float	_Fspace
	Space "tone" frequency. More...

Buffer< std::complex< float > >	_markLUT
	Mark frequency FIR filter LUT. More...

Buffer< std::complex< float > >	_spaceLUT
	Space frequency FIR filter LUT. More...

Buffer< std::complex< float > >	_markHist
	FIR filter buffer. More...

Buffer< std::complex< float > >	_spaceHist
	FIR filter buffer. More...

Buffer< int8_t >	_buffer
	Output buffer. More...

Protected Attributes inherited from sdr::Source
Config	_config
	Holds the source configuration, this can be updated by calling `setConfig`. More...

std::map< SinkBase *, bool >	_sinks
	The connected sinks. More...

std::list< DelegateInterface * >	_eos
	The connected EOS singal handlers. More...

Detailed Description

Implements the basic FSK/AFSK symbol detection.

This node contains two FIR filters for the detection of the mark and space frequencies. The node returns a sequence of symbols (i.e. sub-bits) which need to be processed to obtain a sequenc of transmitted bits (i.e. by the BitStream node).

Constructor & Destructor Documentation

FSKDetector::FSKDetector	(	float	baud,
		float	Fmark,
		float	Fspace
	)

Constructor.

Parameters

baud	Specifies the baud-rate of the signal.
Fmark	Specifies the mark frequency in Hz.
Fspace	Specifies the space frequency in Hz.

Member Function Documentation

uint8_t FSKDetector::_process ( int16_t sample )

protected

Updates the mark/space FIR filter and returns the sampled symbol.

void FSKDetector::config ( const Config & src_cfg )

virtual

Needs to be implemented by any sub-type to check and perform the configuration of the node.

Implements sdr::SinkBase.

void FSKDetector::process	(	const Buffer< int16_t > &	buffer,
		bool	allow_overwrite
	)

virtual

Needs to be implemented by any sub-type to process the received data.

Implements sdr::Sink< int16_t >.

Member Data Documentation

float sdr::FSKDetector::_baud

protected

Baudrate of the transmission.

Needed to compute the filter length of the FIR mark/space filters.

Buffer<int8_t> sdr::FSKDetector::_buffer

protected

Output buffer.

size_t sdr::FSKDetector::_corrLen

protected

The filter lenght.

float sdr::FSKDetector::_Fmark

protected

Mark "tone" frequency.

float sdr::FSKDetector::_Fspace

protected

Space "tone" frequency.

size_t sdr::FSKDetector::_lutIdx

protected

The current FIR filter LUT index.

Buffer< std::complex<float> > sdr::FSKDetector::_markHist

protected

FIR filter buffer.

Buffer< std::complex<float> > sdr::FSKDetector::_markLUT

protected

Mark frequency FIR filter LUT.

Buffer< std::complex<float> > sdr::FSKDetector::_spaceHist

protected

FIR filter buffer.

Buffer< std::complex<float> > sdr::FSKDetector::_spaceLUT

protected

Space frequency FIR filter LUT.

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

/Users/hannes/Uni/Elektronik/sdr/libsdr/src/fsk.hh
/Users/hannes/Uni/Elektronik/sdr/libsdr/src/fsk.cc

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation