spandsp 0.0.6
fsk.c File Reference
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include "floating_fudge.h"
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/complex.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/async.h"
#include "spandsp/fsk.h"
#include "spandsp/private/fsk.h"

Functions

int fsk_tx_restart (fsk_tx_state_t *s, const fsk_spec_t *spec)
fsk_tx_state_tfsk_tx_init (fsk_tx_state_t *s, const fsk_spec_t *spec, get_bit_func_t get_bit, void *user_data)
 Initialise an FSK modem transmit context.
int fsk_tx_release (fsk_tx_state_t *s)
int fsk_tx_free (fsk_tx_state_t *s)
int fsk_tx (fsk_tx_state_t *s, int16_t amp[], int len)
void fsk_tx_power (fsk_tx_state_t *s, float power)
 Adjust an FSK modem transmit context's power output.
void fsk_tx_set_get_bit (fsk_tx_state_t *s, get_bit_func_t get_bit, void *user_data)
void fsk_tx_set_modem_status_handler (fsk_tx_state_t *s, modem_tx_status_func_t handler, void *user_data)
 Change the modem status report function associated with an FSK modem transmit context.
void fsk_rx_signal_cutoff (fsk_rx_state_t *s, float cutoff)
 Adjust an FSK modem receive context's carrier detect power threshold.
float fsk_rx_signal_power (fsk_rx_state_t *s)
void fsk_rx_set_put_bit (fsk_rx_state_t *s, put_bit_func_t put_bit, void *user_data)
void fsk_rx_set_modem_status_handler (fsk_rx_state_t *s, modem_tx_status_func_t handler, void *user_data)
 Change the modem status report function associated with an FSK modem receive context.
int fsk_rx_restart (fsk_rx_state_t *s, const fsk_spec_t *spec, int framing_mode)
fsk_rx_state_tfsk_rx_init (fsk_rx_state_t *s, const fsk_spec_t *spec, int framing_mode, put_bit_func_t put_bit, void *user_data)
 Initialise an FSK modem receive context.
int fsk_rx_release (fsk_rx_state_t *s)
int fsk_rx_free (fsk_rx_state_t *s)
int fsk_rx (fsk_rx_state_t *s, const int16_t *amp, int len)
int fsk_rx_fillin (fsk_rx_state_t *s, int len)
 Fake processing of a missing block of received FSK modem audio samples.

Variables

const fsk_spec_t preset_fsk_specs []

Detailed Description


Function Documentation

int fsk_rx_fillin ( fsk_rx_state_t s,
int  len 
)

Fake processing of a missing block of received FSK modem audio samples.

Fake processing of a missing block of received FSK modem audio samples (e.g due to packet loss).

Parameters:
sThe modem context.
lenThe number of samples to fake.
Returns:
The number of samples unprocessed.

Referenced by t31_rx_fillin().

fsk_rx_state_t* fsk_rx_init ( fsk_rx_state_t s,
const fsk_spec_t spec,
int  framing_mode,
put_bit_func_t  put_bit,
void *  user_data 
)

Initialise an FSK modem receive context.

Initialise an FSK modem receive context.

Parameters:
sThe modem context.
specThe specification of the modem tones and rate.
framing_mode0 for fully asynchronous mode. 1 for synchronous mode. >1 for this many bits per asynchronous character frame.
put_bitThe callback routine used to put the received data.
user_dataAn opaque pointer.
Returns:
A pointer to the modem context, or NULL if there was a problem.

Referenced by adsi_rx_init(), modem_connect_tones_rx_init(), and v18_init().

void fsk_rx_set_modem_status_handler ( fsk_rx_state_t s,
modem_rx_status_func_t  handler,
void *  user_data 
)

Change the modem status report function associated with an FSK modem receive context.

Change the modem status report function associated with an FSK modem receive context.

Parameters:
sThe modem context.
handlerThe callback routine used to report modem status changes.
user_dataAn opaque pointer.
void fsk_rx_signal_cutoff ( fsk_rx_state_t s,
float  cutoff 
)

Adjust an FSK modem receive context's carrier detect power threshold.

Adjust an FSK modem receive context's carrier detect power threshold.

Parameters:
sThe modem context.
cutoffThe power level, in dBm0

References power_meter_level_dbm0().

Referenced by modem_connect_tones_rx_init().

float fsk_rx_signal_power ( fsk_rx_state_t s)

Get the current received signal power.

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

References power_meter_current_dbm0().

fsk_tx_state_t* fsk_tx_init ( fsk_tx_state_t s,
const fsk_spec_t spec,
get_bit_func_t  get_bit,
void *  user_data 
)

Initialise an FSK modem transmit context.

Initialise an FSK modem transmit context.

Parameters:
sThe modem context.
specThe specification of the modem tones and rate.
get_bitThe callback routine used to get the data to be transmitted.
user_dataAn opaque pointer.
Returns:
A pointer to the modem context, or NULL if there was a problem.

Referenced by v18_init(), and v8_init().

void fsk_tx_power ( fsk_tx_state_t s,
float  power 
)

Adjust an FSK modem transmit context's power output.

Adjust an FSK modem transmit context's power output.

Parameters:
sThe modem context.
powerThe power level, in dBm0

References dds_scaling_dbm0().

void fsk_tx_set_modem_status_handler ( fsk_tx_state_t s,
modem_tx_status_func_t  handler,
void *  user_data 
)

Change the modem status report function associated with an FSK modem transmit context.

Change the modem status report function associated with an FSK modem transmit context.

Parameters:
sThe modem context.
handlerThe callback routine used to report modem status changes.
user_dataAn opaque pointer.