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

#define EQUALIZER_DELTA   0.25f

The adaption rate coefficient for the equalizer

Referenced by v22bis_rx_equalizer_state().

#define PULSESHAPER_COEFF_SETS   12

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

Referenced by v22bis_rx_equalizer_state(), and v22bis_rx_symbol_timing_correction().

Function Documentation

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 dds_frequencyf().

int v22bis_rx_equalizer_state ( v22bis_state_t s,
complexf_t **  coeffs 
)
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.
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 power_meter_level_dbm0(), v22bis_state_s::put_bit, v22bis_state_s::put_bit_user_data, v22bis_state_s::status_handler, and v22bis_state_s::status_user_data.

Referenced by v22bis_rx_restart().

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().

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.