v29rx.c File Reference

#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/async.h"
#include "spandsp/power_meter.h"
#include "spandsp/arctan2.h"
#include "spandsp/complex.h"
#include "spandsp/dds.h"
#include "spandsp/complex_filters.h"
#include "spandsp/v29rx.h"

Defines

#define V29_TRAINING_SEG_2_LEN   128
#define V29_TRAINING_SEG_3_LEN   384
#define V29_TRAINING_SEG_4_LEN   48
#define EQUALIZER_DELTA   (0.25*2.0)
#define PULSESHAPER_GAIN   10.00736638
#define PULSESHAPER_COEFF_SETS   48

Enumerations

enum  {
  TRAINING_STAGE_NORMAL_OPERATION = 0, TRAINING_STAGE_SYMBOL_ACQUISITION, TRAINING_STAGE_LOG_PHASE, TRAINING_STAGE_WAIT_FOR_CDCD,
  TRAINING_STAGE_TRAIN_ON_CDCD, TRAINING_STAGE_TRAIN_ON_CDCD_AND_TEST, TRAINING_STAGE_TEST_ONES, TRAINING_STAGE_PARKED
}

Functions

float v29_rx_carrier_frequency (v29_rx_state_t *s)
float v29_rx_symbol_timing_correction (v29_rx_state_t *s)
void v29_rx_signal_cutoff (v29_rx_state_t *s, float cutoff)
float v29_rx_signal_power (v29_rx_state_t *s)
int v29_rx_equalizer_state (v29_rx_state_t *s, complex_t **coeffs)
 Get a snapshot of the current equalizer coefficients.
int v29_rx (v29_rx_state_t *s, const int16_t *amp, int len)
 Process a block of received V.29 modem audio samples.
void v29_rx_set_put_bit (v29_rx_state_t *s, put_bit_func_t put_bit, void *user_data)
 Change the put_bit function associated with a V.29 modem receive context.
int v29_rx_restart (v29_rx_state_t *s, int rate)
 Reinitialise an existing V.29 modem receive context.
v29_rx_state_tv29_rx_init (v29_rx_state_t *s, int rate, put_bit_func_t put_bit, void *user_data)
 Initialise a V.29 modem receive context.
int v29_rx_release (v29_rx_state_t *s)
 Release a V.29 modem receive context.
void v29_rx_set_qam_report_handler (v29_rx_state_t *s, qam_report_handler_t *handler, void *user_data)

Detailed Description


Function Documentation

int v29_rx ( v29_rx_state_t s,
const int16_t *  amp,
int  len 
)

Process a block of received V.29 modem audio samples.

Process a block of received V.29 modem audio samples.

Parameters:
s The modem context.
amp The audio sample buffer.
len The number of samples in the buffer.
Returns:
The number of samples unprocessed.

float v29_rx_carrier_frequency ( v29_rx_state_t s  ) 

Get the current received carrier frequency.

Parameters:
s The modem context.
Returns:
The frequency, in Hertz.

int v29_rx_equalizer_state ( v29_rx_state_t s,
complex_t **  coeffs 
)

Get a snapshot of the current equalizer coefficients.

Get a snapshot of the current equalizer coefficients.

Parameters:
s The modem context.
coeffs The vector of complex coefficients.
Returns:
The number of coefficients in the vector.

v29_rx_state_t* v29_rx_init ( v29_rx_state_t s,
int  rate,
put_bit_func_t  put_bit,
void *  user_data 
)

Initialise a V.29 modem receive context.

Initialise a V.29 modem receive context.

Parameters:
s The modem context.
rate The bit rate of the modem. Valid values are 4800, 7200 and 9600.
put_bit The callback routine used to put the received data.
user_data An opaque pointer passed to the put_bit routine.
Returns:
A pointer to the modem context, or NULL if there was a problem.

int v29_rx_release ( v29_rx_state_t s  ) 

Release a V.29 modem receive context.

Release a V.29 modem receive context.

Parameters:
s The modem context.
Returns:
0 for OK

int v29_rx_restart ( v29_rx_state_t s,
int  rate 
)

Reinitialise an existing V.29 modem receive context.

Reinitialise an existing V.29 modem receive context.

Parameters:
s The modem context.
rate The bit rate of the modem. Valid values are 4800, 7200 and 9600.
Returns:
0 for OK, -1 for bad parameter

void v29_rx_set_put_bit ( v29_rx_state_t s,
put_bit_func_t  put_bit,
void *  user_data 
)

Change the put_bit function associated with a V.29 modem receive context.

Change the put_bit function associated with a V.29 modem receive context.

Parameters:
s The modem context.
put_bit The callback routine used to handle received bits.
user_data An opaque pointer.

void v29_rx_set_qam_report_handler ( v29_rx_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.

void v29_rx_signal_cutoff ( v29_rx_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.

float v29_rx_signal_power ( v29_rx_state_t s  ) 

Get the current received signal power.

Parameters:
s The modem context.
Returns:
The signal power, in dBm0.

float v29_rx_symbol_timing_correction ( v29_rx_state_t s  ) 

Get the current symbol timing correction since startup.

Parameters:
s The modem context.
Returns:
The correction.


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