sdr::Baudot Class Reference

Implements a Baudot decoder. More...

#include <baudot.hh>

Inheritance diagram for sdr::Baudot:

Public Types
enum	Mode { LETTERS, FIGURES }
	Specifies the current code-tables. More...
enum	StopBits { STOP1, STOP15, STOP2 }
	Specifies the number of stop bits. More...

Public Member Functions
	Baudot (StopBits stopBits=STOP15)
	Constructor. More...
virtual void	config (const Config &src_cfg)
	Configures the node. More...
virtual void	process (const Buffer< uint8_t > &buffer, bool allow_overwrite)
	Processes the bit-stream. More...
Public Member Functions inherited from sdr::Sink< uint8_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 Attributes
uint16_t	_bitstream
	The last bits received. More...
size_t	_bitcount
	The number of bits received. More...
Mode	_mode
	The currently selected table. More...
size_t	_bitsPerSymbol
	Specifies the number of half bits per symbol. More...
uint16_t	_pattern
	Specifies the frame pattern. More...
uint16_t	_mask
	Specifies the frame mask. More...
uint16_t	_stopHBits
	Number of half bits forming the stop bit. More...
Buffer< uint8_t >	_buffer
	The 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...

Static Protected Attributes
static char	_letter [32]
	Code table for letters. More...
static char	_figure [32]
	Code table for symbols or figure (i.e. More...

Additional Inherited Members
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...

Detailed Description

Implements a Baudot decoder.

Inconjecture with the (A)FSK demodulator, it enables the reception of radio teletype (RTTY) messages.

Please note that a baudot encoded char is usually transmitted in a frame with one start bit and 1, 1.5 or 2 stop bits. Hence this node expects to receive two bits for one decoded bit in order to detect the 1.5 stop bits reliably.

I.e. to receive a 45.45 baud RTTY signal, the (A)FSK demodulator need to be configured for 90.90 baud (= 2*45.45 baud).

Constructor & Destructor Documentation

Baudot::Baudot

(

StopBits

stopBits = STOP15

)

Constructor.

Member Function Documentation

void Baudot::config ( const Config &  src_cfg )

virtual

Configures the node.

Implements sdr::SinkBase.

void Baudot::process ( const Buffer< uint8_t > &  buffer, bool  allow_overwrite  )

virtual

Processes the bit-stream.

Implements sdr::Sink< uint8_t >.

Member Data Documentation

size_t sdr::Baudot::_bitcount

protected

The number of bits received.

size_t sdr::Baudot::_bitsPerSymbol

protected

Specifies the number of half bits per symbol.

uint16_t sdr::Baudot::_bitstream

protected

The last bits received.

Buffer<uint8_t> sdr::Baudot::_buffer

protected

The output buffer.

char Baudot::_figure

staticprotected

Initial value:

= {  0, '3','\n', '-', ' ','\a', '8', '7','\n', '?', '4','\'', ',', '!',
                            ':', '(', '5', '"', ')', '2', '#', '6', '0', '1', '9', '?', '&',   0,
                            '.', '/', ';',  0}

Code table for symbols or figure (i.e.

numbers).

char Baudot::_letter

staticprotected

Initial value:

= {  0, 'E','\n', 'A', ' ', 'S', 'I', 'U','\n', 'D', 'R', 'J', 'N', 'F',
                            'C', 'K', 'T', 'Z', 'L', 'W', 'H', 'Y', 'P', 'Q', 'O', 'B', 'G',   0,
                            'M', 'X', 'V',  0}

Code table for letters.

uint16_t sdr::Baudot::_mask

protected

Specifies the frame mask.

Mode sdr::Baudot::_mode

protected

The currently selected table.

uint16_t sdr::Baudot::_pattern

protected

Specifies the frame pattern.

uint16_t sdr::Baudot::_stopHBits

protected

Number of half bits forming the stop bit.

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

• /Users/hannes/Uni/Elektronik/sdr/libsdr/src/baudot.hh
• /Users/hannes/Uni/Elektronik/sdr/libsdr/src/baudot.cc