v29tx.c File Reference

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.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/async.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/v29tx.h"

Defines

#define CARRIER_NOMINAL_FREQ   1700.0f
#define V29_TRAINING_SEG_TEP   0
#define V29_TRAINING_SEG_1   (V29_TRAINING_SEG_TEP + 480)
#define V29_TRAINING_SEG_2   (V29_TRAINING_SEG_1 + 48)
#define V29_TRAINING_SEG_3   (V29_TRAINING_SEG_2 + 128)
#define V29_TRAINING_SEG_4   (V29_TRAINING_SEG_3 + 384)
#define V29_TRAINING_END   (V29_TRAINING_SEG_4 + 48)
#define V29_TRAINING_SHUTDOWN_END   (V29_TRAINING_END + 32)
#define PULSESHAPER_GAIN   (9.9888356312f/10.0f)
#define PULSESHAPER_COEFF_SETS   10

Functions

int v29_tx (v29_tx_state_t *s, int16_t amp[], int len)
void v29_tx_power (v29_tx_state_t *s, float power)
 Adjust a V.29 modem transmit context's output power.
void v29_tx_set_get_bit (v29_tx_state_t *s, get_bit_func_t get_bit, void *user_data)
 Change the get_bit function associated with a V.29 modem transmit context.
int v29_tx_restart (v29_tx_state_t *s, int rate, int tep)
 Reinitialise an existing V.29 modem transmit context.
v29_tx_state_tv29_tx_init (v29_tx_state_t *s, int rate, int tep, get_bit_func_t get_bit, void *user_data)
 Initialise a V.29 modem transmit context.
int v29_tx_release (v29_tx_state_t *s)
 Release a V.29 modem transmit context.

Detailed Description


Function Documentation

v29_tx_state_t* v29_tx_init ( v29_tx_state_t s,
int  rate,
int  tep,
get_bit_func_t  get_bit,
void *  user_data 
)

Initialise a V.29 modem transmit context.

Initialise a V.29 modem transmit context. This must be called before the first use of the context, to initialise its contents.

Parameters:
s The modem context.
rate The bit rate of the modem. Valid values are 4800, 7200 and 9600.
tep TRUE is the optional TEP tone is to be transmitted.
get_bit The callback routine used to get the data to be transmitted.
user_data An opaque pointer.
Returns:
A pointer to the modem context, or NULL if there was a problem.

void v29_tx_power ( v29_tx_state_t s,
float  power 
)

Adjust a V.29 modem transmit context's output power.

Adjust a V.29 modem transmit context's power output.

Parameters:
s The modem context.
power The power level, in dBm0

int v29_tx_release ( v29_tx_state_t s  ) 

Release a V.29 modem transmit context.

Release a V.29 modem transmit context.

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

int v29_tx_restart ( v29_tx_state_t s,
int  rate,
int  tep 
)

Reinitialise an existing V.29 modem transmit context.

Reinitialise an existing V.29 modem transmit context, so it may be reused.

Parameters:
s The modem context.
rate The bit rate of the modem. Valid values are 4800, 7200 and 9600.
tep TRUE is the optional TEP tone is to be transmitted.
Returns:
0 for OK, -1 for bad parameter

void v29_tx_set_get_bit ( v29_tx_state_t s,
get_bit_func_t  get_bit,
void *  user_data 
)

Change the get_bit function associated with a V.29 modem transmit context.

Change the get_bit function associated with a V.29 modem transmit context.

Parameters:
s The modem context.
get_bit The callback routine used to get the data to be transmitted.
user_data An opaque pointer.


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