BaseBandRX – this is the audio processing chain for the recieve path. More...

#include <BaseBandRX.hxx>

Inheritance diagram for SoDa::BaseBandRX:

Public Member Functions
	BaseBandRX (Params params, DatMBox rx_stream, CmdMBox cmd_stream, AudioIfc audio_ifc)
	the constructor More...

void	run ()
	the run method – does the work of the audio receiver process More...

Public Member Functions inherited from SoDa::SoDaThread
	SoDaThread (const std::string &oname)

void	start ()
	Execute the threads run loop. More...

void	join ()
	more properly "Wait for this thread to exit its run loop". More...

bool	waitForJoin (unsigned int m)
	wait for the thread to stop running, or the specified time to pass. More...

void	execCommand (Command *cmd)
	Execute (dispatch) a message removed from the command stream to one of the basic Command handler functions. More...

Public Member Functions inherited from SoDa::SoDaBase
	SoDaBase (const std::string &oname)
	The constructor – pass a name for the object. More...

std::string &	getObjName ()
	get the name of this object More...

SoDaBase *	findSoDaObject (const std::string &oname)
	find a SoDa Object by name. More...

double	getTime ()
	Get a time stamp in nS resolution that monotonically increases and that is very inexpensive (typically < 100nS). More...

Public Member Functions inherited from SoDa::Debug
	Debug (std::string _unit_name=std::string("UNKNOWN"))

	Debug (const char *_unit_name_cstr)

	Debug (unsigned int _debug_level, std::string _unit_name=std::string("UNKNOWN"))

	Debug (unsigned int _debug_level, const char *_unit_name_cstr)

void	debugMsg (const std::string &msg, unsigned int threshold=1)

void	debugMsg (const boost::format &fmt, unsigned int threshold=1)

void	debugMsg (const char *msg, unsigned int threshold=1)

void	setDebugLevel (unsigned int v)

unsigned int	getDebugLevel ()

Private Member Functions
void	execGetCommand (Command *cmd)
	execute GET commands from the command channel More...

void	execSetCommand (Command *cmd)
	handle SET commands from the command channel More...

void	execRepCommand (Command *cmd)
	handle Report commands from the command channel More...

void	demodulateSSB (std::complex< float > *drxbuf, SoDa::Command::ModulationType mod)
	demodulate the input stream as an SSB signal place the resulting audio buffer on the audio output queue. More...

void	demodulateAM (std::complex< float > *drxbuf)
	demodulate the input stream as an amplitude modulated signal place the resulting audio buffer on the audio output queue. More...

void	demodulateNBFM (std::complex< float > *drxbuf, SoDa::Command::ModulationType mod, float af_gain)
	demodulate the input stream as a narrowband frequency modulated signal place the resulting audio buffer on the audio output queue. More...

void	demodulateWBFM (SoDaBuf *rxbuf, SoDa::Command::ModulationType mod, float af_gain)
	demodulate the input stream as a wideband frequency modulated signal place the resulting audio buffer on the audio output queue. More...

void	demodulate (SoDaBuf *rxbuf)
	apply the currently selected demodulation scheme to the input RX buffer place the resulting audio buffer on the audio output queue. More...

void	repAFFilterShape ()
	send a report of the lower and upper edges of the IF passband based on the current filter and modulation type. More...

void	pendAudioBuffer (float *b)
	put an audio buffer on the "pending for output" list More...

float *	getNextAudioBuffer ()
	return the next queued audio buffer to pass to the audio output device More...

void	flushAudioBuffers ()
	empty the queue of pending audio buffers, we're going into TX mode. More...

void	freeAudioBuffer (float *b)
	add an audio buffer to the free list, we've dispatched it. More...

float *	getFreeAudioBuffer ()
	remove a buffer from the free list, or allocate one if the free list is empty. More...

int	readyAudioBuffers ()
	return number audio buffers available More...

void	buildFilterMap ()
	build the audio filter map for selected bandwidths More...

Private Attributes
unsigned int	audio_buffer_size
	size of output audio buffer chunk More...

unsigned int	rf_buffer_size
	size of input RF buffer chunk More...

double	audio_sample_rate
	sample rate of audio output – assumed 48KHz More...

double	rf_sample_rate
	sample rate of RF input from USRP – assumed 625KHz More...

bool	audio_rx_stream_enabled
	if true, send pending audio buffers to output More...

bool	audio_rx_stream_needs_start
	if true, the audio output device needs a wakeup More...

bool	sidetone_stream_enabled
	if true, send CW sidetone to audio output More...

SoDa::Command::ModulationType	rx_modulation
	current receive modulation mode (USB,LSB,CW_U,CW_L,NBFM,WBFM,AM,...) More...

DatMBox *	rx_stream
	mailbox producing rx sample stream from USRP More...

CmdMBox *	cmd_stream
	mailbox producing command stream from user More...

unsigned int	rx_subs
	mailbox subscription ID for rx data stream More...

unsigned int	cmd_subs
	mailbox subscription ID for command stream More...

AudioIfc *	audio_ifc
	pointer to the audio interface (output) object More...

bool	in_catchup
	when true, the audio server has fallen behind... More...

bool	in_fallback
	when true, the audio server has gotten ahead... More...

unsigned int	catchup_rand_mask
	a mask to use for fast selection of a random index into an audio buffer. More...

std::queue< float * >	free_buffers
	a pool of free audio buffers More...

std::queue< float * >	ready_buffers
	a list of audio buffers ready to send to the output More...

boost::mutex	free_lock
	lock for the free_buffers pool More...

boost::mutex	ready_lock
	lock for the ready_buffers_pool More...

float *	sidetone_silence
	a sequence of zero samples to stuff silence into the audio More...

SoDa::ReSample625to48 *	rf_resampler
	downsample the RF input to 48KS/s More...

SoDa::ReSample625to48 *	wbfm_resampler
	downsample the RF input to 48KS/s for WBFM unit More...

SoDa::Command::AudioFilterBW	af_filter_selection
	currently audio filter selector More...

SoDa::OSFilter *	cur_audio_filter
	currently selected audio filter More...

SoDa::OSFilter *	fm_audio_filter
	audio filter for FM (wider passband) More...

SoDa::OSFilter *	am_pre_filter
	Before AM demod, we do some (6KHz) prefilter. More...

SoDa::OSFilter *	nbfm_pre_filter
	Before NBFM demod, we do some (15KHz) prefilter – rf rate. More...

SoDa::OSFilter *	am_audio_filter
	After AM demod, we do a second filter. More...

std::map< SoDa::Command::AudioFilterBW, SoDa::OSFilter * >	filter_map
	map filter selectors to the filter objects More...

SoDa::HilbertTransformer *	hilbert
	hilbert transform object for SSB/CW widgets More...

float	af_gain
	audio gain setting for RX mode More...

float	af_sidetone_gain
	audio gain setting for TX/CW mode More...

float *	cur_af_gain
	pointer to the gain setting for this mode More...

float	last_phase_samp
	history value used to calculate dPhase/dt in FM atan based discriminator. More...

MedianFilter3< float >	fmMedianFilter
	simple 3 point median filter for FM units More...

unsigned int	dbg_ctr
	debug counter, used to support one-time or infrequent bulletins More...

std::ofstream	dbg_out

bool	audio_save_enable

std::ofstream	audio_file

std::ofstream	audio_file2

Additional Inherited Members
Static Public Member Functions inherited from SoDa::Debug
static void	setDefaultLevel (unsigned int v)

static unsigned int	getDefaultLevel ()

static void	setGlobalLevel (unsigned int v)

static unsigned int	getGlobalLevel ()

Static Public Attributes inherited from SoDa::Debug
static boost::mutex	debug_msg_mutex

Protected Member Functions inherited from SoDa::Debug
std::string	curDateTime ()

Protected Attributes inherited from SoDa::Debug
std::string	unit_name
	the name of the unit reporting status More...

unsigned int	debug_level
	the debug level (threshold) for messages More...

Static Protected Attributes inherited from SoDa::Debug
static unsigned int	default_debug_level = 0

static unsigned int	global_debug_level = 0

Detailed Description

BaseBandRX – this is the audio processing chain for the recieve path.

The BaseBandRX unit accepts the 3rd IF (nominally 80kHz to 200kHz) from the USRPRX thread on the rx_stream.

In most cases (all but Wide Band FM) the rx stream is downselected by a 625 to 48 resampler before being passed through an audio filter and finally demodulated.

As each buffer/timeslice is demodulated, it is placed on a queue of outbound audio blocks for the host processor's audio system. Since there is some slop in the timing (specifically, the clock governing the radio is not necessarily in sync with the audio system clock) the BaseBandRX unit monitors the backlog of outbound audio buffers. When this backlog gets longer than about 400mS, the unit will "drop out" a sample here and there until the downstream sound system catches up.

BaseBandRX supports CW_U (upper sideband CW), CW_L (lower sideband CW), USB, and LSB modulation via the phasing method, since both I and Q channels are available. AM is performed with a simple magnitude detector.

Definition at line 75 of file BaseBandRX.hxx.

Constructor & Destructor Documentation

◆ BaseBandRX()

SoDa::BaseBandRX::BaseBandRX	(	Params *	params,
		DatMBox *	rx_stream,
		CmdMBox *	cmd_stream,
		AudioIfc *	audio_ifc
	)

the constructor

Parameters

params	command line parameter object
rx_stream	pointer to mailbox holding USRP RX bitstream
cmd_stream	pointer to mailbox holding control/report commands
audio_ifc	pointer to the audio output handler

Definition at line 37 of file BaseBandRX.cxx.

References af_filter_selection, af_gain, af_sidetone_gain, audio_buffer_size, audio_ifc, audio_rx_stream_enabled, audio_rx_stream_needs_start, audio_sample_rate, audio_save_enable, buildFilterMap(), SoDa::Command::BW_6000, catchup_rand_mask, cmd_stream, cmd_subs, cur_af_gain, cur_audio_filter, dbg_ctr, SoDa::Debug::debugMsg(), filter_map, SoDa::Params::getAFBufferSize(), SoDa::Params::getAudioSampleRate(), getFreeAudioBuffer(), SoDa::Params::getRFBufferSize(), SoDa::Params::getRXRate(), hilbert, in_catchup, in_fallback, last_phase_samp, pendAudioBuffer(), rf_buffer_size, rf_resampler, rf_sample_rate, rx_modulation, rx_stream, rx_subs, sidetone_silence, SoDa::MultiMBox< T >::subscribe(), SoDa::Command::USB, and wbfm_resampler.

Member Function Documentation

◆ buildFilterMap()

void SoDa::BaseBandRX::buildFilterMap ( )

private

build the audio filter map for selected bandwidths

Definition at line 614 of file BaseBandRX.cxx.

References am_audio_filter, am_pre_filter, audio_buffer_size, audio_sample_rate, SoDa::Command::BW_100, SoDa::Command::BW_2000, SoDa::Command::BW_500, SoDa::Command::BW_6000, SoDa::Command::BW_PASS, filter_map, fm_audio_filter, nbfm_pre_filter, rf_buffer_size, and rf_sample_rate.

Referenced by BaseBandRX().

◆ demodulate()

void SoDa::BaseBandRX::demodulate ( SoDaBuf * rxbuf )

private

apply the currently selected demodulation scheme to the input RX buffer place the resulting audio buffer on the audio output queue.

Parameters

rxbuf RF input buffer

Definition at line 246 of file BaseBandRX.cxx.

References SoDa::Command::AM, am_pre_filter, SoDa::ReSample625to48::apply(), SoDa::OSFilter::apply(), audio_buffer_size, cur_af_gain, cur_audio_filter, SoDa::Command::CW_L, SoDa::Command::CW_U, demodulateAM(), demodulateNBFM(), demodulateSSB(), demodulateWBFM(), SoDa::SoDaBuf::getComplexBuf(), SoDa::Command::LSB, SoDa::Command::NBFM, nbfm_pre_filter, rf_resampler, rx_modulation, SoDa::Command::USB, and SoDa::Command::WBFM.

Referenced by run().

◆ demodulateAM()

void SoDa::BaseBandRX::demodulateAM ( std::complex< float > * drxbuf )

private

demodulate the input stream as an amplitude modulated signal place the resulting audio buffer on the audio output queue.

Parameters

drxbuf downsampled RF input buffer

Definition at line 220 of file BaseBandRX.cxx.

References am_audio_filter, SoDa::OSFilter::apply(), audio_buffer_size, getFreeAudioBuffer(), and pendAudioBuffer().

Referenced by demodulate().

◆ demodulateNBFM()

void SoDa::BaseBandRX::demodulateNBFM	(	std::complex< float > *	drxbuf,
		SoDa::Command::ModulationType	mod,
		float	af_gain
	)

private

demodulate the input stream as a narrowband frequency modulated signal place the resulting audio buffer on the audio output queue.

Parameters

drxbuf	downsampled RF input buffer
mod	modulation type – NBFM
af_gain	factor to goose the audio output

Definition at line 160 of file BaseBandRX.cxx.

References SoDa::OSFilter::apply(), audio_buffer_size, audio_file2, audio_save_enable, cur_audio_filter, getFreeAudioBuffer(), last_phase_samp, and pendAudioBuffer().

Referenced by demodulate().

◆ demodulateSSB()

void SoDa::BaseBandRX::demodulateSSB	(	std::complex< float > *	drxbuf,
		SoDa::Command::ModulationType	mod
	)

private

demodulate the input stream as an SSB signal place the resulting audio buffer on the audio output queue.

Parameters

drxbuf	downsampled RF input buffer
mod	modulation type – LSB, USB, CW_U, or CW_R

Definition at line 201 of file BaseBandRX.cxx.

References SoDa::HilbertTransformer::applyIQ(), audio_buffer_size, SoDa::Command::CW_L, getFreeAudioBuffer(), hilbert, SoDa::Command::LSB, and pendAudioBuffer().

Referenced by demodulate().

◆ demodulateWBFM()

void SoDa::BaseBandRX::demodulateWBFM	(	SoDaBuf *	rxbuf,
		SoDa::Command::ModulationType	mod,
		float	af_gain
	)

private

demodulate the input stream as a wideband frequency modulated signal place the resulting audio buffer on the audio output queue.

Note the wideband FM unit takes the raw RX buffer rather than the downsampled rx buffer.

Parameters

rxbuf	RF input buffer
mod	modulation type – WBFM
af_gain	factor to goose the audio output

Definition at line 123 of file BaseBandRX.cxx.

References SoDa::ReSample625to48::apply(), SoDa::OSFilter::apply(), fm_audio_filter, SoDa::SoDaBuf::getComplexBuf(), getFreeAudioBuffer(), last_phase_samp, pendAudioBuffer(), rf_buffer_size, and wbfm_resampler.

Referenced by demodulate().

◆ execGetCommand()

void SoDa::BaseBandRX::execGetCommand ( SoDa::Command * cmd )

privatevirtual

execute GET commands from the command channel

Parameters

cmd	the incoming command

Reimplemented from SoDa::SoDaThread.

Definition at line 397 of file BaseBandRX.cxx.

References af_filter_selection, af_gain, SoDa::Command::BaseBandRX, cmd_stream, SoDa::Command::DBG_REP, free_buffers, SoDa::SoDaBase::getObjName(), SoDa::Command::iparms, SoDa::MultiMBox< T >::put(), readyAudioBuffers(), SoDa::Command::REP, SoDa::Command::RX_AF_FILTER, SoDa::Command::RX_AF_GAIN, and SoDa::Command::target.

◆ execRepCommand()

void SoDa::BaseBandRX::execRepCommand ( SoDa::Command * cmd )

privatevirtual

handle Report commands from the command channel

Parameters

cmd	the incoming command

Reimplemented from SoDa::SoDaThread.

Definition at line 421 of file BaseBandRX.cxx.

◆ execSetCommand()

void SoDa::BaseBandRX::execSetCommand ( SoDa::Command * cmd )

privatevirtual

handle SET commands from the command channel

Parameters

cmd	the incoming command

Reimplemented from SoDa::SoDaThread.

Definition at line 321 of file BaseBandRX.cxx.

References af_filter_selection, af_gain, af_sidetone_gain, audio_ifc, audio_rx_stream_enabled, audio_rx_stream_needs_start, SoDa::Command::BW_6000, cmd_stream, cur_af_gain, cur_audio_filter, SoDa::Command::CW_L, SoDa::Command::CW_U, SoDa::Debug::debugMsg(), SoDa::Command::dparms, filter_map, flushAudioBuffers(), SoDa::Command::iparms, SoDa::MultiMBox< T >::put(), SoDa::Command::REP, repAFFilterShape(), SoDa::Command::RX_AF_FILTER, SoDa::Command::RX_AF_GAIN, SoDa::Command::RX_AF_SIDETONE_GAIN, SoDa::Command::RX_MODE, rx_modulation, sidetone_stream_enabled, SoDa::AudioIfc::sleepOut(), SoDa::Command::target, SoDa::Command::TX_MODE, SoDa::Command::TX_STATE, and SoDa::AudioIfc::wakeOut().

◆ flushAudioBuffers()

void SoDa::BaseBandRX::flushAudioBuffers ( )

private

empty the queue of pending audio buffers, we're going into TX mode.

Definition at line 603 of file BaseBandRX.cxx.

References freeAudioBuffer(), ready_buffers, and ready_lock.

Referenced by execSetCommand().

◆ freeAudioBuffer()

void SoDa::BaseBandRX::freeAudioBuffer ( float * b )

private

add an audio buffer to the free list, we've dispatched it.

Parameters

b	pointer to audio buffer.

Definition at line 558 of file BaseBandRX.cxx.

References free_buffers, and free_lock.

Referenced by flushAudioBuffers(), and run().

◆ getFreeAudioBuffer()

float * SoDa::BaseBandRX::getFreeAudioBuffer ( )

private

remove a buffer from the free list, or allocate one if the free list is empty.

Returns: a pointer to a free audio buffer

Definition at line 563 of file BaseBandRX.cxx.

References audio_buffer_size, free_buffers, and free_lock.

Referenced by BaseBandRX(), demodulateAM(), demodulateNBFM(), demodulateSSB(), and demodulateWBFM().

◆ getNextAudioBuffer()

float * SoDa::BaseBandRX::getNextAudioBuffer ( )

private

return the next queued audio buffer to pass to the audio output device

Returns: a pointer to the next buffer in sequence

Definition at line 593 of file BaseBandRX.cxx.

References ready_buffers, and ready_lock.

Referenced by run().

◆ pendAudioBuffer()

void SoDa::BaseBandRX::pendAudioBuffer ( float * b )

private

put an audio buffer on the "pending for output" list

Parameters

b	pointer to an audio buffer

Definition at line 582 of file BaseBandRX.cxx.

References audio_buffer_size, audio_file, audio_save_enable, ready_buffers, and ready_lock.

Referenced by BaseBandRX(), demodulateAM(), demodulateNBFM(), demodulateSSB(), and demodulateWBFM().

◆ readyAudioBuffers()

int SoDa::BaseBandRX::readyAudioBuffers ( )

private

return number audio buffers available

Definition at line 576 of file BaseBandRX.cxx.

References ready_buffers, and ready_lock.

Referenced by execGetCommand(), and run().

◆ repAFFilterShape()

void SoDa::BaseBandRX::repAFFilterShape ( )

private

send a report of the lower and upper edges of the IF passband based on the current filter and modulation type.

Definition at line 297 of file BaseBandRX.cxx.

References SoDa::Command::AM, cmd_stream, cur_audio_filter, SoDa::Command::CW_L, SoDa::Command::CW_U, SoDa::OSFilter::getFilterEdges(), SoDa::Command::LSB, SoDa::MultiMBox< T >::put(), SoDa::Command::REP, SoDa::Command::RX_AF_FILTER_SHAPE, rx_modulation, and SoDa::Command::USB.

Referenced by execSetCommand().

◆ run()

void SoDa::BaseBandRX::run ( )

virtual

the run method – does the work of the audio receiver process

6)) {

Implements SoDa::SoDaThread.

Definition at line 426 of file BaseBandRX.cxx.

References audio_buffer_size, audio_file, audio_file2, audio_ifc, audio_rx_stream_enabled, audio_rx_stream_needs_start, audio_save_enable, catchup_rand_mask, cmd_stream, cmd_subs, SoDa::AudioIfc::currentPlaybackState(), SoDa::Debug::debugMsg(), demodulate(), SoDa::SoDaThread::execCommand(), SoDa::MultiMBox< T >::free(), freeAudioBuffer(), SoDa::MultiMBox< T >::get(), getNextAudioBuffer(), in_catchup, in_fallback, readyAudioBuffers(), rx_stream, rx_subs, SoDa::AudioIfc::send(), SoDa::AudioIfc::sendBufferReady(), SoDa::Command::STOP, SoDa::Command::target, and SoDa::AudioIfc::wakeOut().

Member Data Documentation

◆ af_filter_selection

SoDa::Command::AudioFilterBW SoDa::BaseBandRX::af_filter_selection

private

currently audio filter selector

Definition at line 253 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), execGetCommand(), and execSetCommand().

◆ af_gain

float SoDa::BaseBandRX::af_gain

private

audio gain setting for RX mode

Definition at line 268 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), execGetCommand(), and execSetCommand().

◆ af_sidetone_gain

float SoDa::BaseBandRX::af_sidetone_gain

private

audio gain setting for TX/CW mode

Definition at line 269 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and execSetCommand().

◆ am_audio_filter

SoDa::OSFilter* SoDa::BaseBandRX::am_audio_filter

private

After AM demod, we do a second filter.

Definition at line 258 of file BaseBandRX.hxx.

Referenced by buildFilterMap(), and demodulateAM().

◆ am_pre_filter

SoDa::OSFilter* SoDa::BaseBandRX::am_pre_filter

private

Before AM demod, we do some (6KHz) prefilter.

Definition at line 256 of file BaseBandRX.hxx.

Referenced by buildFilterMap(), and demodulate().

◆ audio_buffer_size

unsigned int SoDa::BaseBandRX::audio_buffer_size

private

size of output audio buffer chunk

Definition at line 173 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), buildFilterMap(), demodulate(), demodulateAM(), demodulateNBFM(), demodulateSSB(), getFreeAudioBuffer(), pendAudioBuffer(), and run().

◆ audio_file

std::ofstream SoDa::BaseBandRX::audio_file

private

Definition at line 284 of file BaseBandRX.hxx.

Referenced by pendAudioBuffer(), and run().

◆ audio_file2

std::ofstream SoDa::BaseBandRX::audio_file2

private

Definition at line 285 of file BaseBandRX.hxx.

Referenced by demodulateNBFM(), and run().

◆ audio_ifc

AudioIfc* SoDa::BaseBandRX::audio_ifc

private

pointer to the audio interface (output) object

Definition at line 188 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), execSetCommand(), and run().

◆ audio_rx_stream_enabled

bool SoDa::BaseBandRX::audio_rx_stream_enabled

private

if true, send pending audio buffers to output

Definition at line 177 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), execSetCommand(), and run().

◆ audio_rx_stream_needs_start

bool SoDa::BaseBandRX::audio_rx_stream_needs_start

private

if true, the audio output device needs a wakeup

Definition at line 178 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), execSetCommand(), and run().

◆ audio_sample_rate

double SoDa::BaseBandRX::audio_sample_rate

private

sample rate of audio output – assumed 48KHz

Definition at line 175 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and buildFilterMap().

◆ audio_save_enable

bool SoDa::BaseBandRX::audio_save_enable

private

Definition at line 283 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), demodulateNBFM(), pendAudioBuffer(), and run().

◆ catchup_rand_mask

unsigned int SoDa::BaseBandRX::catchup_rand_mask

private

a mask to use for fast selection of a random index into an audio buffer.

Definition at line 233 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and run().

◆ cmd_stream

CmdMBox* SoDa::BaseBandRX::cmd_stream

private

mailbox producing command stream from user

Definition at line 184 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), execGetCommand(), execSetCommand(), repAFFilterShape(), and run().

◆ cmd_subs

unsigned int SoDa::BaseBandRX::cmd_subs

private

mailbox subscription ID for command stream

Definition at line 186 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and run().

◆ cur_af_gain

float* SoDa::BaseBandRX::cur_af_gain

private

pointer to the gain setting for this mode

Definition at line 270 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), demodulate(), and execSetCommand().

◆ cur_audio_filter

SoDa::OSFilter* SoDa::BaseBandRX::cur_audio_filter

private

currently selected audio filter

Definition at line 254 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), demodulate(), demodulateNBFM(), execSetCommand(), and repAFFilterShape().

◆ dbg_ctr

unsigned int SoDa::BaseBandRX::dbg_ctr

private

debug counter, used to support one-time or infrequent bulletins

Definition at line 279 of file BaseBandRX.hxx.

Referenced by BaseBandRX().

◆ dbg_out

std::ofstream SoDa::BaseBandRX::dbg_out

private

Definition at line 280 of file BaseBandRX.hxx.

◆ filter_map

std::map<SoDa::Command::AudioFilterBW, SoDa::OSFilter *> SoDa::BaseBandRX::filter_map

private

map filter selectors to the filter objects

Definition at line 262 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), buildFilterMap(), and execSetCommand().

◆ fm_audio_filter

SoDa::OSFilter* SoDa::BaseBandRX::fm_audio_filter

private

audio filter for FM (wider passband)

Definition at line 255 of file BaseBandRX.hxx.

Referenced by buildFilterMap(), and demodulateWBFM().

◆ fmMedianFilter

MedianFilter3<float> SoDa::BaseBandRX::fmMedianFilter

private

simple 3 point median filter for FM units

Definition at line 276 of file BaseBandRX.hxx.

◆ free_buffers

std::queue<float *> SoDa::BaseBandRX::free_buffers

private

a pool of free audio buffers

Definition at line 235 of file BaseBandRX.hxx.

Referenced by execGetCommand(), freeAudioBuffer(), and getFreeAudioBuffer().

◆ free_lock

boost::mutex SoDa::BaseBandRX::free_lock

private

lock for the free_buffers pool

Definition at line 238 of file BaseBandRX.hxx.

Referenced by freeAudioBuffer(), and getFreeAudioBuffer().

◆ hilbert

SoDa::HilbertTransformer* SoDa::BaseBandRX::hilbert

private

hilbert transform object for SSB/CW widgets

Definition at line 265 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and demodulateSSB().

◆ in_catchup

bool SoDa::BaseBandRX::in_catchup

private

when true, the audio server has fallen behind...

Definition at line 231 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and run().

◆ in_fallback

bool SoDa::BaseBandRX::in_fallback

private

when true, the audio server has gotten ahead...

Definition at line 232 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and run().

◆ last_phase_samp

float SoDa::BaseBandRX::last_phase_samp

private

history value used to calculate dPhase/dt in FM atan based discriminator.

Definition at line 273 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), demodulateNBFM(), and demodulateWBFM().

◆ nbfm_pre_filter

SoDa::OSFilter* SoDa::BaseBandRX::nbfm_pre_filter

private

Before NBFM demod, we do some (15KHz) prefilter – rf rate.

Definition at line 257 of file BaseBandRX.hxx.

Referenced by buildFilterMap(), and demodulate().

◆ ready_buffers

std::queue<float *> SoDa::BaseBandRX::ready_buffers

private

a list of audio buffers ready to send to the output

Definition at line 236 of file BaseBandRX.hxx.

Referenced by flushAudioBuffers(), getNextAudioBuffer(), pendAudioBuffer(), and readyAudioBuffers().

◆ ready_lock

boost::mutex SoDa::BaseBandRX::ready_lock

private

lock for the ready_buffers_pool

Definition at line 239 of file BaseBandRX.hxx.

Referenced by flushAudioBuffers(), getNextAudioBuffer(), pendAudioBuffer(), and readyAudioBuffers().

◆ rf_buffer_size

unsigned int SoDa::BaseBandRX::rf_buffer_size

private

size of input RF buffer chunk

Definition at line 174 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), buildFilterMap(), and demodulateWBFM().

◆ rf_resampler

SoDa::ReSample625to48* SoDa::BaseBandRX::rf_resampler

private

downsample the RF input to 48KS/s

Definition at line 244 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and demodulate().

◆ rf_sample_rate

double SoDa::BaseBandRX::rf_sample_rate

private

sample rate of RF input from USRP – assumed 625KHz

Definition at line 176 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and buildFilterMap().

◆ rx_modulation

SoDa::Command::ModulationType SoDa::BaseBandRX::rx_modulation

private

current receive modulation mode (USB,LSB,CW_U,CW_L,NBFM,WBFM,AM,...)

Definition at line 181 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), demodulate(), execSetCommand(), and repAFFilterShape().

◆ rx_stream

DatMBox* SoDa::BaseBandRX::rx_stream

private

mailbox producing rx sample stream from USRP

Definition at line 183 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and run().

◆ rx_subs

unsigned int SoDa::BaseBandRX::rx_subs

private

mailbox subscription ID for rx data stream

Definition at line 185 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and run().

◆ sidetone_silence

float* SoDa::BaseBandRX::sidetone_silence

private

a sequence of zero samples to stuff silence into the audio

Definition at line 241 of file BaseBandRX.hxx.

Referenced by BaseBandRX().

◆ sidetone_stream_enabled

bool SoDa::BaseBandRX::sidetone_stream_enabled

private

if true, send CW sidetone to audio output

Definition at line 179 of file BaseBandRX.hxx.

Referenced by execSetCommand().

◆ wbfm_resampler

SoDa::ReSample625to48* SoDa::BaseBandRX::wbfm_resampler

private

downsample the RF input to 48KS/s for WBFM unit

Definition at line 246 of file BaseBandRX.hxx.

Referenced by BaseBandRX(), and demodulateWBFM().

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

src/BaseBandRX.hxx
src/BaseBandRX.cxx

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ BaseBandRX()

Member Function Documentation

◆ buildFilterMap()

◆ demodulate()

◆ demodulateAM()

◆ demodulateNBFM()

◆ demodulateSSB()

◆ demodulateWBFM()

◆ execGetCommand()

◆ execRepCommand()

◆ execSetCommand()

◆ flushAudioBuffers()

◆ freeAudioBuffer()

◆ getFreeAudioBuffer()

◆ getNextAudioBuffer()

◆ pendAudioBuffer()

◆ readyAudioBuffers()

◆ repAFFilterShape()

◆ run()

Member Data Documentation

◆ af_filter_selection

◆ af_gain

◆ af_sidetone_gain

◆ am_audio_filter

◆ am_pre_filter

◆ audio_buffer_size

◆ audio_file

◆ audio_file2

◆ audio_ifc

◆ audio_rx_stream_enabled

◆ audio_rx_stream_needs_start

◆ audio_sample_rate

◆ audio_save_enable

◆ catchup_rand_mask

◆ cmd_stream

◆ cmd_subs

◆ cur_af_gain

◆ cur_audio_filter

◆ dbg_ctr

◆ dbg_out

◆ filter_map

◆ fm_audio_filter

◆ fmMedianFilter

◆ free_buffers

◆ free_lock

◆ hilbert

◆ in_catchup

◆ in_fallback

◆ last_phase_samp

◆ nbfm_pre_filter

◆ ready_buffers

◆ ready_lock

◆ rf_buffer_size

◆ rf_resampler

◆ rf_sample_rate

◆ rx_modulation

◆ rx_stream

◆ rx_subs

◆ sidetone_silence

◆ sidetone_stream_enabled

◆ wbfm_resampler