spandsp 0.0.6
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)   (x)
 
#define ms_to_symbols(t)   (((t)*600)/1000)
 
#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. More...
 
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. More...
 
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

◆ PULSESHAPER_COEFF_SETS

#define PULSESHAPER_COEFF_SETS   12

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

Function Documentation

◆ v22bis_rx_carrier_frequency()

float v22bis_rx_carrier_frequency ( v22bis_state_t s)

Get the current received carrier frequency.

Parameters
sThe modem context.
Returns
The frequency, in Hertz.

References v22bis_state_s::carrier_phase_rate, and dds_frequencyf().

◆ 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
coeffsThe vector of complex coefficients.
Returns
The number of coefficients in the vector.

References v22bis_state_s::eq_coeff.

◆ 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
sThe modem context.
Returns
0 for OK, -1 for bad parameter

References v22bis_state_s::rrc_filter.

◆ 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
sThe modem context.
handlerThe handler routine.
user_dataAn opaque pointer passed to the handler routine.

◆ 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
sThe modem context.
cutoffThe signal cutoff power, in dBm0.

References v22bis_state_s::carrier_off_power, v22bis_state_s::carrier_on_power, and power_meter_level_dbm0().

◆ v22bis_rx_signal_power()

float v22bis_rx_signal_power ( v22bis_state_t s)

Get a current received signal power.

Parameters
sThe modem context.
Returns
The signal power, in dBm0.

References power_meter_current_dbm0(), and v22bis_state_s::rx_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
sThe modem context.
Returns
The correction.

References PULSESHAPER_COEFF_SETS, and v22bis_state_s::total_baud_timing_correction.