v22bis_rx.c File Reference

#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "floating_fudge.h"
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/complex.h"
#include "spandsp/vector_float.h"
#include "spandsp/complex_vector_float.h"
#include "spandsp/vector_int.h"
#include "spandsp/complex_vector_int.h"
#include "spandsp/async.h"
#include "spandsp/power_meter.h"
#include "spandsp/arctan2.h"
#include "spandsp/dds.h"
#include "spandsp/complex_filters.h"
#include "spandsp/v29rx.h"
#include "spandsp/v22bis.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/v22bis.h"
#include "v22bis_rx_1200_floating_rrc.h"
#include "v22bis_rx_2400_floating_rrc.h"

Macros
#define	FP_SCALE(x)
#define	ms_to_symbols(t)
#define	EQUALIZER_DELTA   0.25f
#define	PULSESHAPER_COEFF_SETS   12

Functions
float	v22bis_rx_carrier_frequency (v22bis_state_t *s)
float	v22bis_rx_symbol_timing_correction (v22bis_state_t *s)
float	v22bis_rx_signal_power (v22bis_state_t *s)
void	v22bis_rx_signal_cutoff (v22bis_state_t *s, float cutoff)
void	v22bis_report_status_change (v22bis_state_t *s, int status)
int	v22bis_rx_equalizer_state (v22bis_state_t *s, complexf_t **coeffs)
	Get a snapshot of the current equalizer coefficients.
void	v22bis_equalizer_coefficient_reset (v22bis_state_t *s)
int	v22bis_rx (v22bis_state_t *s, const int16_t amp[], int len)
int	v22bis_rx_fillin (v22bis_state_t *s, int len)
int	v22bis_rx_restart (v22bis_state_t *s)
	Reinitialise an existing V.22bis modem receive context.
void	v22bis_rx_set_qam_report_handler (v22bis_state_t *s, qam_report_handler_t handler, void *user_data)

Macro Definition Documentation

EQUALIZER_DELTA

#define EQUALIZER_DELTA   0.25f

The adaption rate coefficient for the equalizer

FP_SCALE

#define FP_SCALE

(

x

)

Value:

(x)

ms_to_symbols

#define ms_to_symbols

(

t

)

Value:

(((t)*600)/1000)

PULSESHAPER_COEFF_SETS

#define PULSESHAPER_COEFF_SETS   12

The number of phase shifted coefficient set for the pulse shaping/bandpass filter

Referenced by v22bis_rx_symbol_timing_correction().

Function Documentation

v22bis_rx_carrier_frequency()

float v22bis_rx_carrier_frequency

(

v22bis_state_t *

s

)

Get the current received carrier frequency.

Parameters

s	The modem context.

Returns

The frequency, in Hertz.

References dds_frequencyf(), and v22bis_rx_carrier_frequency().

Referenced by SPAN_DECLARE_NONSTD(), and v22bis_rx_carrier_frequency().

v22bis_rx_equalizer_state()

int v22bis_rx_equalizer_state	(	v22bis_state_t *	s,
		complexf_t **	coeffs )

Get a snapshot of the current equalizer coefficients.

Get a snapshot of the current equalizer coefficients.

Parameters

coeffs

The vector of complex coefficients.

Returns

The number of coefficients in the vector.

References v22bis_rx_equalizer_state().

Referenced by SPAN_DECLARE_NONSTD(), and v22bis_rx_equalizer_state().

v22bis_rx_restart()

int v22bis_rx_restart

(

v22bis_state_t *

s

)

Reinitialise an existing V.22bis modem receive context.

Reinitialise an existing V.22bis modem receive context.

Parameters

s	The modem context.

Returns

0 for OK, -1 for bad parameter

References v22bis_state_s::calling_party, dds_phase_ratef(), power_meter_init(), and v22bis_rx_signal_cutoff().

v22bis_rx_set_qam_report_handler()

void v22bis_rx_set_qam_report_handler	(	v22bis_state_t *	s,
		qam_report_handler_t	handler,
		void *	user_data )

Set a handler routine to process QAM status reports

Parameters

s	The modem context.
handler	The handler routine.
user_data	An opaque pointer passed to the handler routine.

References v22bis_rx_set_qam_report_handler().

Referenced by SPAN_DECLARE_NONSTD(), and v22bis_rx_set_qam_report_handler().

v22bis_rx_signal_cutoff()

void v22bis_rx_signal_cutoff	(	v22bis_state_t *	s,
		float	cutoff )

Set the power level at which the carrier detection will cut in

Parameters

s	The modem context.
cutoff	The signal cutoff power, in dBm0.

References power_meter_level_dbm0(), and v22bis_rx_signal_cutoff().

Referenced by SPAN_DECLARE_NONSTD(), v22bis_rx_restart(), and v22bis_rx_signal_cutoff().

v22bis_rx_signal_power()

float v22bis_rx_signal_power

(

v22bis_state_t *

s

)

Get a current received signal power.

Parameters

s	The modem context.

Returns

The signal power, in dBm0.

References power_meter_current_dbm0(), and v22bis_rx_signal_power().

Referenced by SPAN_DECLARE_NONSTD(), and v22bis_rx_signal_power().

v22bis_rx_symbol_timing_correction()

float v22bis_rx_symbol_timing_correction

(

v22bis_state_t *

s

)

Get the current symbol timing correction since startup.

Parameters

s	The modem context.

Returns

The correction.

References PULSESHAPER_COEFF_SETS, and v22bis_rx_symbol_timing_correction().

Referenced by SPAN_DECLARE_NONSTD(), and v22bis_rx_symbol_timing_correction().