v22bis_tx.c File Reference

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.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/async.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/v29rx.h"
#include "spandsp/v22bis.h"
#include "v22bis_tx_floating_rrc.h"

Defines
#define	ms_to_symbols(t)   (((t)*600)/1000)
Enumerations
enum	{   V22BIS_TRAINING_STAGE_NORMAL_OPERATION = 0, V22BIS_TRAINING_STAGE_INITIAL_SILENCE, V22BIS_TRAINING_STAGE_UNSCRAMBLED_ONES, V22BIS_TRAINING_STAGE_UNSCRAMBLED_0011,   V22BIS_TRAINING_STAGE_SCRAMBLED_ONES_AT_1200, V22BIS_TRAINING_STAGE_SCRAMBLED_ONES_AT_2400, V22BIS_TRAINING_STAGE_PARKED }
Functions
int	v22bis_tx (v22bis_state_t *s, int16_t amp[], int len)
	Generate a block of V.22bis modem audio samples.
void	v22bis_tx_power (v22bis_state_t *s, float power)
	Adjust a V.22bis modem transmit context's output power.
void	v22bis_set_get_bit (v22bis_state_t *s, get_bit_func_t get_bit, void *user_data)
	Change the get_bit function associated with a V.22bis modem context.
void	v22bis_set_put_bit (v22bis_state_t *s, put_bit_func_t put_bit, void *user_data)
	Change the put_bit function associated with a V.22bis modem context.
int	v22bis_restart (v22bis_state_t *s, int bit_rate)
	Reinitialise an existing V.22bis modem context.
v22bis_state_t *	v22bis_init (v22bis_state_t *s, int bit_rate, int guard, int caller, get_bit_func_t get_bit, put_bit_func_t put_bit, void *user_data)
	Initialise a V.22bis modem context.
int	v22bis_free (v22bis_state_t *s)
	Free a V.22bis modem receive context.
Variables
const complexf_t	v22bis_constellation [16]

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Detailed Description

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Function Documentation

int v22bis_free

(

v22bis_state_t *

s

)

Free a V.22bis modem receive context.

Free a V.22bis modem receive context.

Parameters:

s

The modem context.

Returns:

0 for OK

v22bis_state_t* v22bis_init	(	v22bis_state_t *	s,
		int	bit_rate,
		int	guard,
		int	caller,
		get_bit_func_t	get_bit,
		put_bit_func_t	put_bit,
		void *	user_data
	)

Initialise a V.22bis modem context.

Initialise a V.22bis modem context. This must be called before the first use of the context, to initialise its contents.

Parameters:

	s	The modem context.
	bit_rate	The bit rate of the modem. Valid values are 1200 and 2400.
	guard	The guard tone option. 0 = none, 1 = 550Hz, 2 = 1800Hz.
	caller	TRUE if this is the calling modem.
	get_bit	The callback routine used to get the data to be transmitted.
	put_bit	The callback routine used to get the data to be transmitted.
	user_data	An opaque pointer, passed in calls to the get and put routines.

Returns:

A pointer to the modem context, or NULL if there was a problem.

References v22bis_state_t::bit_rate, v22bis_state_t::caller, v22bis_state_t::carrier_phase_rate, dds_phase_ratef(), v22bis_state_t::get_bit, v22bis_state_t::guard_level, v22bis_state_t::guard_phase_rate, v22bis_state_t::logging, v22bis_state_t::put_bit, v22bis_state_t::tx, v22bis_state_t::user_data, v22bis_restart(), and v22bis_tx_power().

int v22bis_restart	(	v22bis_state_t *	s,
		int	bit_rate
	)

Reinitialise an existing V.22bis modem context.

Reinitialise an existing V.22bis modem context, so it may be reused.

Parameters:

	s	The modem context.
	bit_rate	The bit rate of the modem. Valid values are 1200 and 2400.

Returns:

0 for OK, -1 for bad parameter.

References v22bis_rx_restart().

Referenced by v22bis_init().

void v22bis_set_get_bit	(	v22bis_state_t *	s,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Change the get_bit function associated with a V.22bis modem context.

Change the get_bit function associated with a V.22bis modem context.

Parameters:

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

References v22bis_state_t::get_bit, and v22bis_state_t::user_data.

void v22bis_set_put_bit	(	v22bis_state_t *	s,
		put_bit_func_t	put_bit,
		void *	user_data
	)

Change the put_bit function associated with a V.22bis modem context.

Change the get_bit function associated with a V.22bis modem context.

Parameters:

	s	The modem context.
	put_bit	The callback routine used to process the data received.
	user_data	An opaque pointer.

References v22bis_state_t::put_bit, and v22bis_state_t::user_data.

int v22bis_tx	(	v22bis_state_t *	s,
		int16_t	amp[],
		int	len
	)

Generate a block of V.22bis modem audio samples.

Generate a block of V.22bis 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.

References v22bis_state_t::baud_phase, v22bis_state_t::carrier_phase, v22bis_state_t::carrier_phase_rate, dds_complexf(), dds_modf(), v22bis_state_t::gain, v22bis_state_t::guard_level, v22bis_state_t::guard_phase, v22bis_state_t::guard_phase_rate, complexf_t::im, complexf_t::re, v22bis_state_t::rrc_filter, v22bis_state_t::rrc_filter_step, v22bis_state_t::shutdown, and v22bis_state_t::tx.

void v22bis_tx_power	(	v22bis_state_t *	s,
		float	power
	)

Adjust a V.22bis modem transmit context's output power.

Adjust a V.22bis modem transmit context's power output.

Parameters:

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

References v22bis_state_t::gain, and v22bis_state_t::tx.

Referenced by v22bis_init().

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Variable Documentation

const complexf_t v22bis_constellation[16]

Initial value:

{
    { 1.0f,  1.0f},
    { 3.0f,  1.0f},
    { 1.0f,  3.0f},
    { 3.0f,  3.0f},
    {-1.0f,  1.0f},
    {-1.0f,  3.0f},
    {-3.0f,  1.0f},
    {-3.0f,  3.0f},
    {-1.0f, -1.0f},
    {-3.0f, -1.0f},
    {-1.0f, -3.0f},
    {-3.0f, -3.0f},
    { 1.0f, -1.0f},
    { 1.0f, -3.0f},
    { 3.0f, -1.0f},
    { 3.0f, -3.0f}
}