v27ter_tx.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/v27ter_tx.h"

Defines
#define	CARRIER_NOMINAL_FREQ   1800.0f
#define	V27TER_TRAINING_SEG_1   0
#define	V27TER_TRAINING_SEG_2   (V27TER_TRAINING_SEG_1 + 320)
#define	V27TER_TRAINING_SEG_3   (V27TER_TRAINING_SEG_2 + 32)
#define	V27TER_TRAINING_SEG_4   (V27TER_TRAINING_SEG_3 + 50)
#define	V27TER_TRAINING_SEG_5   (V27TER_TRAINING_SEG_4 + 1074)
#define	V27TER_TRAINING_END   (V27TER_TRAINING_SEG_5 + 8)
#define	V27TER_TRAINING_SHUTDOWN_END   (V27TER_TRAINING_END + 32)
#define	PULSESHAPER_2400_GAIN   (19.972065748f/20.0f)
#define	PULSESHAPER_2400_COEFF_SETS   20
#define	PULSESHAPER_4800_GAIN   (4.9913162900f/5.0f)
#define	PULSESHAPER_4800_COEFF_SETS   5
Functions
int	v27ter_tx (v27ter_tx_state_t *s, int16_t amp[], int len)
	Generate a block of V.27ter modem audio samples.
void	v27ter_tx_power (v27ter_tx_state_t *s, float power)
	Adjust a V.27ter modem transmit context's output power.
void	v27ter_tx_set_get_bit (v27ter_tx_state_t *s, get_bit_func_t get_bit, void *user_data)
	Change the get_bit function associated with a V.27ter modem transmit context.
int	v27ter_tx_restart (v27ter_tx_state_t *s, int rate, int tep)
	Reinitialise an existing V.27ter modem transmit context.
v27ter_tx_state_t *	v27ter_tx_init (v27ter_tx_state_t *s, int rate, int tep, get_bit_func_t get_bit, void *user_data)
	Initialise a V.27ter modem transmit context.
int	v27ter_tx_release (v27ter_tx_state_t *s)
	Release a V.27ter modem transmit context.

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Detailed Description

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Function Documentation

int v27ter_tx	(	v27ter_tx_state_t *	s,
		int16_t	amp[],
		int	len
	)

Generate a block of V.27ter modem audio samples.

Generate a block of V.27ter modem audio samples.

Parameters:

	s	The modem context.
	amp	The audio sample buffer.
	len	The number of samples to be generated.

Returns:

The number of samples actually generated.

v27ter_tx_state_t* v27ter_tx_init	(	v27ter_tx_state_t *	s,
		int	rate,
		int	tep,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Initialise a V.27ter modem transmit context.

Initialise a V.27ter modem transmit context.

Parameters:

	s	The modem context.
	rate	The bit rate of the modem. Valid values are 2400 and 4800.
	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 v27ter_tx_power	(	v27ter_tx_state_t *	s,
		float	power
	)

Adjust a V.27ter modem transmit context's output power.

Adjust a V.27ter modem transmit context's power output.

Parameters:

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

int v27ter_tx_release

(

v27ter_tx_state_t *

s

)

Release a V.27ter modem transmit context.

Release a V.27ter modem transmit context.

Parameters:

s

The modem context.

Returns:

0 for OK

int v27ter_tx_restart	(	v27ter_tx_state_t *	s,
		int	rate,
		int	tep
	)

Reinitialise an existing V.27ter modem transmit context.

Reinitialise an existing V.27ter modem transmit context, so it may be reused.

Parameters:

	s	The modem context.
	rate	The bit rate of the modem. Valid values are 2400 and 4800.
	tep	TRUE is the optional TEP tone is to be transmitted.

Returns:

0 for OK, -1 for bad parameter

void v27ter_tx_set_get_bit	(	v27ter_tx_state_t *	s,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Change the get_bit function associated with a V.27ter modem transmit context.

Change the get_bit function associated with a V.27ter 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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