libspandsp 0.0.4
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#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.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/power_meter.h"
#include "spandsp/arctan2.h"
#include "spandsp/dds.h"
#include "spandsp/complex_filters.h"
#include "spandsp/v29rx.h"
#include "v29rx_floating_rrc.h"
Defines | |
#define | CARRIER_NOMINAL_FREQ 1700.0f |
#define | BAUD_RATE 2400 |
#define | EQUALIZER_DELTA 0.21f |
#define | V29_TRAINING_SEG_2_LEN 128 |
#define | V29_TRAINING_SEG_3_LEN 384 |
#define | V29_TRAINING_SEG_4_LEN 48 |
#define | SYNC_LOW_BAND_EDGE_COEFF_0 1.829281f |
#define | SYNC_LOW_BAND_EDGE_COEFF_1 -0.980100f |
#define | SYNC_HIGH_BAND_EDGE_COEFF_0 -1.285907f |
#define | SYNC_HIGH_BAND_EDGE_COEFF_1 -0.980100f |
#define | SYNC_CROSS_CORR_COEFF_A -0.932131f |
#define | SYNC_CROSS_CORR_COEFF_B 0.752802f |
#define | SYNC_CROSS_CORR_COEFF_C -0.378857f |
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, complexf_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 bit_rate, int old_train) |
Reinitialise an existing V.29 modem receive context. | |
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. | |
int | v29_rx_free (v29_rx_state_t *s) |
Free 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) |
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.
s | The modem context. |
amp | The audio sample buffer. |
len | The number of samples in the buffer. |
References v29_rx_state_t::agc_scaling, v29_rx_state_t::bit_rate, v29_rx_state_t::carrier_drop_pending, v29_rx_state_t::carrier_phase, v29_rx_state_t::carrier_phase_rate, dds_advancef(), dds_lookup_complexf(), v29_rx_state_t::eq_put_step, v29_rx_state_t::high_sample, complexf_t::im, complexi_t::im, v29_rx_state_t::last_sample, v29_rx_state_t::low_samples, v29_rx_state_t::power, power_meter_init(), power_meter_update(), v29_rx_state_t::put_bit, PUTBIT_CARRIER_DOWN, PUTBIT_CARRIER_UP, complexf_t::re, complexi_t::re, v29_rx_state_t::rrc_filter, v29_rx_state_t::rrc_filter_step, v29_rx_state_t::signal_present, v29_rx_state_t::symbol_sync_high, v29_rx_state_t::symbol_sync_low, v29_rx_state_t::training_stage, v29_rx_state_t::user_data, and v29_rx_restart().
float v29_rx_carrier_frequency | ( | v29_rx_state_t * | s | ) |
Get the current received carrier frequency.
s | The modem context. |
References v29_rx_state_t::carrier_phase_rate, and dds_frequencyf().
int v29_rx_equalizer_state | ( | v29_rx_state_t * | s, |
complexf_t ** | coeffs | ||
) |
Get a snapshot of the current equalizer coefficients.
Get a snapshot of the current equalizer coefficients.
s | The modem context. |
coeffs | The vector of complex coefficients. |
int v29_rx_free | ( | v29_rx_state_t * | s | ) |
Free a V.29 modem receive context.
Free a V.29 modem receive context.
s | The modem context. |
v29_rx_state_t* v29_rx_init | ( | v29_rx_state_t * | s, |
int | bit_rate, | ||
put_bit_func_t | put_bit, | ||
void * | user_data | ||
) |
Initialise a V.29 modem receive context.
Initialise a V.29 modem receive context.
s | The modem context. |
bit_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. |
References v29_rx_state_t::logging, v29_rx_state_t::put_bit, v29_rx_state_t::user_data, v29_rx_restart(), and v29_rx_signal_cutoff().
Referenced by fax_init(), t31_init(), and t38_gateway_init().
int v29_rx_restart | ( | v29_rx_state_t * | s, |
int | bit_rate, | ||
int | old_train | ||
) |
Reinitialise an existing V.29 modem receive context.
Reinitialise an existing V.29 modem receive context.
s | The modem context. |
bit_rate | The bit rate of the modem. Valid values are 4800, 7200 and 9600. |
old_train | TRUE if a previous trained values are to be reused. |
References v29_rx_state_t::agc_scaling, v29_rx_state_t::agc_scaling_save, v29_rx_state_t::baud_half, v29_rx_state_t::baud_phase, v29_rx_state_t::bit_rate, v29_rx_state_t::carrier_drop_pending, v29_rx_state_t::carrier_phase, v29_rx_state_t::carrier_phase_rate, v29_rx_state_t::carrier_phase_rate_save, v29_rx_state_t::carrier_track_i, v29_rx_state_t::carrier_track_p, dds_phase_ratef(), v29_rx_state_t::eq_skip, v29_rx_state_t::high_sample, v29_rx_state_t::last_sample, v29_rx_state_t::low_samples, v29_rx_state_t::old_train, v29_rx_state_t::power, power_meter_init(), v29_rx_state_t::rrc_filter, v29_rx_state_t::rrc_filter_step, v29_rx_state_t::scramble_reg, v29_rx_state_t::signal_present, v29_rx_state_t::symbol_sync_dc_filter, v29_rx_state_t::symbol_sync_high, v29_rx_state_t::symbol_sync_low, v29_rx_state_t::total_baud_timing_correction, v29_rx_state_t::training_cd, v29_rx_state_t::training_count, v29_rx_state_t::training_scramble_reg, and v29_rx_state_t::training_stage.
Referenced by v29_rx(), and v29_rx_init().
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.
s | The modem context. |
put_bit | The callback routine used to handle received bits. |
user_data | An opaque pointer. |
References v29_rx_state_t::put_bit, and v29_rx_state_t::user_data.
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
s | The modem context. |
handler | The handler routine. |
user_data | An opaque pointer passed to the handler routine. |
References v29_rx_state_t::qam_report, and v29_rx_state_t::qam_user_data.
void v29_rx_signal_cutoff | ( | v29_rx_state_t * | s, |
float | cutoff | ||
) |
Set the power level at which the carrier detection will cut in
s | The modem context. |
cutoff | The signal cutoff power, in dBm0. |
References v29_rx_state_t::carrier_off_power, v29_rx_state_t::carrier_on_power, and power_meter_level_dbm0().
Referenced by fax_init(), t31_init(), t38_gateway_init(), and v29_rx_init().
float v29_rx_signal_power | ( | v29_rx_state_t * | s | ) |
Get the current received signal power.
s | The modem context. |
References v29_rx_state_t::power, and power_meter_current_dbm0().
float v29_rx_symbol_timing_correction | ( | v29_rx_state_t * | s | ) |
Get the current symbol timing correction since startup.
s | The modem context. |
References v29_rx_state_t::total_baud_timing_correction.